2-Thiazolidinone
Pyrrolidine Pyrrole Thiazole Imidazole Thiophene Pyrazine Piperidine Piperazine Morpholine Phenazine

2-Thiazolidinone


    • Product Name 2-Thiazolidinone
    • Alias Thiazolidin-2-one
    • Einecs 211-185-8
    • Mininmum Order 1g
    • Factory Site West Ujimqin Banner, Xilingol League, Inner Mongolia, China
    • Price Inquiry sales9@bouling-chem.com
    • Manufacturer Bouling Chemical Co., Limited
    • CONTACT NOW
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    Specifications

    HS Code

    454578
    Molecular Formula C3H5NO2S
    Molar Mass 119.14 g/mol
    Appearance White to off - white solid
    Odor Odorless
    Melting Point 128 - 132 °C
    Solubility In Water Slightly soluble
    Solubility In Organic Solvents Soluble in polar organic solvents like ethanol, acetone
    Stability Stable under normal conditions
    Ph Neutral in aqueous solution
    Crystal Structure Typically forms monoclinic crystals

    As an accredited 2-Thiazolidinone factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing 250 - gram bottles of 2 - Thiazolidinone, tightly sealed for chemical stability.
    Shipping 2 - Thiazolidinone is shipped in well - sealed containers, following strict chemical transportation regulations. Packaging ensures protection from external factors. Shipment is via approved carriers, with safety measures to prevent any leakage or damage during transit.
    Storage 2 - Thiazolidinone should be stored in a cool, dry place away from direct sunlight and heat sources. Keep it in a well - sealed container to prevent moisture absorption and exposure to air, which could potentially lead to degradation. Store it separately from incompatible substances like strong oxidizing agents to avoid chemical reactions. Ensure proper labeling for easy identification and safe handling.
    Application of 2-Thiazolidinone
    A suspension of 2‑thiazolidinone (1.0 molar equivalent) in anhydrous toluene is brought to 40–45 °C under a nitrogen blanket within a glass‑lined reactor equipped with a pitched‑blade turbine agitator. Methyl iodide (1.05 eq) is dosed over 90 minutes while the jacket temperature is held at 48 °C, yielding the 3‑methyl‑2‑thiazolidinone intermediate. After aqueous workup at pH 9.5–10.0 and phase separation, the organic layer is concentrated under vacuum (50 mbar, bath 60 °C) to a non‑volatile residue that crystallizes upon seeding. The resulting 3‑methyl‑2‑thiazolidinone is charged into a second stage together with benzaldehyde (1.15 eq) and potassium carbonate (0.15 eq) in methanol, and the mixture is refluxed (64–66 °C) for 6–8 hours. The aldol condensation product, 5‑benzylidene‑3‑methyl‑2‑thiazolidinone, precipitates when the batch is cooled to 0–5 °C and is isolated on a Nutsche filter. Hydrolysis follows in 6 M hydrochloric acid at 105–110 °C for 14–16 hours under reflux, which cleaves the thiazolidinone ring, liberates benzaldehyde (removed by steam distillation), and yields a hydrochloride salt from which D‑penicillamine is freed by adjusting to the isoelectric point (pH 5.0–5.2) with aqueous ammonia. Recrystallization from ethanol‑water (1:3 v/v) in the presence of 0.1 wt% activated carbon produces a product whose specific rotation [α]D25 is consistently between ‑62.0° and ‑64.5° (c=1, 0.1 M NaOH). The manufacturing stream must comply with ICH Q7 GMP guidelines for active pharmaceutical ingredients; residual solvents are controlled to USP <467> Option 1 limits, and the final heavy‑metal profile is verified against USP <231> method II. Penicillamine derived from this route enters tablet compression as the 125 mg or 250 mg dosage form for Wilson’s disease management, where USP monograph requires related substances below 1.0% for total impurities and 0.3% for any single unknown impurity. Production‑scale batches typically experience a yield drop of 2–4 percentage points when relative humidity in the crystallization suite exceeds 60% because the product forms a monohydrate with altered dissolution kinetics; dedicated dehumidification to 40% RH is therefore maintained. Filtration time on a 0.6 m² Hastelloy C‑22 Nutsche can extend from a baseline 25 minutes to over 50 minutes if the cooling ramp is faster than 0.3 °C/min, creating fines that blind the filter cloth, a bottleneck routinely addressed by a linear cooling profile programmed into the distributed control system.

    What Limits the Calcium‑Zinc Stabilizer Window in Flexible PVC? – 2‑Thiazolidinone as a Secondary Co‑stabilizer

    Dry‑blend formulations for flexible PVC extrusion (single‑screw, L/D 30:1, compression ratio 3.2:1) routinely combine a primary Ca/Zn carboxylate package with a secondary co‑stabilizer to suppress catastrophic dehydrochlorination during the 190–205 °C melt window. When 2‑thiazolidinone is evaluated as the secondary organic co‑stabilizer at levels between 0.15 and 0.40 phr on 100 phr PVC (K‑value 68–70, suspension grade), the compound’s sulfur and nitrogen sites act synergistically by scavenging free‑hydrogen chloride and by displacing labile allylic chlorine atoms through a nucleophilic substitution pathway, both mechanisms competing favorably against the “zinc‑burn” sudden‑blackening phenomenon. A typical starting‑point formulation reads: PVC‑S 100 phr, DINP 45 phr, epoxidized soybean oil 5 phr, calcium stearate 0.6 phr, zinc stearate 0.3 phr, and 2‑thiazolidinone 0.25 phr. On a conical twin‑screw extruder (counter‑rotating, 55 mm screw diameter, output 120 kg/h), the static thermal stability measured by Congo red according to ISO 182‑1:1990 increases from a baseline of 18 minutes to 32–36 minutes at 200 °C, while the dynamic stability recorded on a Brabender Plasticorder at 60 rpm and 190 °C shows the torque inflection point delayed by 12–15 minutes. Early‑color hold, judged visually against RAL 7035 standards after 10‑minute oven aging at 195 °C, remains cream‑white in the co‑stabilized variant whereas the reference turns pale beige. Migration resistance is verified by pressing the finished film against white PE under 5 kPa load at 70 °C for 24 hours; no yellow staining is observed when the co‑stabilizer loading stays below 0.35 phr. Beyond that threshold, the compound’s limited compatibility with the plasticized matrix leads to exudation that can foul calendar rolls, a failure mode reported on three‑roll polishing stacks operating with nip gaps narrower than 0.15 mm. Compliance with EU RoHS Directive 2011/65/EU annex II restrictions on lead and cadmium is maintained, and the formulation passes EN 71‑3:2019 migration limits for antimony, arsenic, barium, cadmium, chromium, lead, mercury, and selenium when the film is intended for toy‑contact applications. Processors who convert from a conventional β‑diketone co‑stabilizer to 2‑thiazolidinone often note a 1–2‑minute longer pre‑heating requirement in the first barrel zone to compensate for the slightly endothermic dissolution profile of the heterocycle into the plasticizer phase; this is accommodated by raising zone‑1 setpoint from 155 °C to 160 °C on extruders equipped with ceramic‑band heaters.
    Static heat stability (Congo red, ISO 182‑1:1990) at 200 °C
    Co‑stabilizer package 2‑Thiazolidinone (phr) Time to pH 3 (min) Early colour (10 min)
    Ca/Zn only 0.00 18 Pale beige
    Ca/Zn + β‑diketone 0.25 29 Off‑white
    Ca/Zn + 2‑thiazolidinone 0.25 34 Cream‑white
    Ca/Zn + 2‑thiazolidinone (high load) 0.40 38 Cream‑white, trace exudation after 48 h
    Electrolytic copper deposition baths operated at 25–28 °C with a sulfuric acid concentration of 180–210 g/L and copper ion content of 18–25 g/L depend on organic additive packages to deliver plated through‑holes with uniform thickness even at aspect ratios exceeding 10:1. 2‑Thiazolidinone, when condensed with p‑hydroxybenzaldehyde in a separate reactor to form a Schiff‑base brightener, introduces a sulfur‑containing heterocycle that adsorbs preferentially on high‑current‑density sites and moderates the local deposition rate. The condensation is conducted at 70–75 °C in ethanol with 0.5 mol% acetic acid catalyst; the resulting product is diluted to a 10 g/L aqueous stock solution and metered into the plating bath at a start‑up dosage of 2–4 mL per litre of bath volume. Once the Hull cell test (brass panel, 267 mL cell, 2 A, 5‑minute plating) produces a mirror‑bright range from 0.5 to 8.0 A/dm², the bath is transferred to a vertical continuous plating line where the air‑agitation flow rate is held at 0.8–1.2 L/(min·L bath) and continuous carbon filtration (1–2 μm) removes organic breakdown products. Replenishment is controlled by ampere‑hour metering: 0.6–0.8 mL of the 10 g/L stock per ampere‑hour maintains elongation of the deposit above 12% (IPC‑TM‑650 method 2.4.18.2), while tensile strength typically stays between 300 and 380 MPa. When the brightener concentration drops below the threshold detectable by cyclic voltammetric stripping (peak area reduction >30% relative to the make‑up condition, measured with a platinum rotating‑disc electrode at 2500 rpm), step coverage at the mid‑board barrel deteriorates below the IPC‑6012 Class 3 requirement of 20 μm minimum average wall thickness. Baths containing the 2‑thiazolidinone adduct also show a pronounced sensitivity to chloride ion, which must be controlled within 40–70 ppm; levels above 80 ppm induce a hazy low‑current‑density appearance accompanied by a drop in throwing power from 85% to below 72% in the Haring‑Blum cell. Operators compensate by adding silver sulfate to precipitate excess chloride, a corrective step that itself must not exceed 0.1 g/L to avoid silver co‑deposition. Print‑circuit‑board manufacturers adopting this additive for high‑aspect‑ratio backplanes report a reduction in reverse‑pulse‑plating dwell times by approximately 15% relative to traditional Janus Green B‑based systems, attributed to faster ionization of the thiazolidinone‑derived adsorption layer during the anodic pulse (+40 mA/cm², 2 ms).The thermal and hydrolytic stability of Group II and Group III base oils in circulating systems exposed to 90–120 °C bulk oil temperatures is routinely extended by ashless antioxidant packages that interrupt the radical‑chain autoxidation cycle. 2‑Thiazolidinone reacts with alkyl halides under phase‑transfer conditions (toluene/50% NaOH, tetrabutylammonium bromide 0.04 eq, 80 °C) to install a C4–C8 alkyl chain at the nitrogen, yielding an oil‑soluble derivative that melts below ‑30 °C and begins to decompose only above 290 °C by differential scanning calorimetry (10 °C/min, N2). When this alkylated 2‑thiazolidinone is blended into an ISO VG 46 turbine oil (API Group II, sulfur <15 ppm) at a treat rate of 0.8 wt%, the Rotating Pressure Vessel Oxidation Test (ASTM D2272) induction time rises from a baseline of 320 minutes to 490–540 minutes. Additive response is less pronounced in severely hydrocracked Group III stocks, where the saturation level exceeds 99.5% and the natural inhibitor content is negligible; here the same 0.8 wt% dosage yields an RPVOT increase of only 110–140 minutes relative to the non‑additized reference. Field experience from a 25‑MW steam‑turbine set operating with shell‑and‑tube lube‑oil coolers indicates that the addition of this antioxidant halves the rate of varnish potential increase as monitored by MPC (ASTM D7843, ΔE <20 after 12 months versus ΔE 42 for the previous phenolic‑only system). The heterocycle also contributes mild metal‑deactivation activity toward yellow‑metal components: a three‑day copper‑strip corrosion test (ASTM D130) at 121 °C consistently yields a 1a or 1b classification. However, 2‑thiazolidinone‑derived antioxidants are incompatible with polyalkylene glycol‑based synthetic lubricants at concentrations above 0.2 wt%, where phase separation occurs and forms a dark lower layer that plugs 3‑micron absolute‑rated filters; this limitation confines their use to hydrocarbon‑based fluids.

    When Bromide Extraction Drag‑Out Enters the Developer — Antifoggant Behaviour in Fine‑Grain Emulsions

    Silver halide microcrystals in monodisperse negative‑working emulsions (mean grain size 0.4–0.8 µm, iodide content 1.5–3.0 mol%) acquire electron‑trapping surface states during chemical sensitization with sodium thiosulfate and tetrachloroauric(III) acid at 55–60 °C over 90–120 minutes. Unchecked, these states increase fog density to 0.08–0.15 optical density units when the film is processed in a hydroquinone‑phenidone developer at 20 °C for 7 minutes. 2‑Thiazolidinone added to the emulsion ‑ after sulfur‑and‑gold sensitization but before coating on polyethylene terephthalate base – adsorbs to the grain surface through its thioamide‑like functionality, selectively stabilizing the traps that would otherwise catalyze reduction of unexposed grains. The compound is introduced as a 0.5 wt% methanolic solution, targeting a final concentration of 0.12–0.35 mmol per mole of silver halide. At 0.12 mmol/Ag mol, fog density drops below 0.02 with no measurable loss of blue‑light speed (ISO 5800:1987 method, processing in ISO 1009 chemistry). Pushing the dosage to 0.35 mmol/Ag mol further suppresses pressure‑induced fog (evaluated by a weighted‑roller test at 2.5 N/cm) but introduces a high‑light contrast reduction of 4–6%, quantified by the slope of the characteristic curve between densities 0.8 and 2.2. The manufacturing trade‑off therefore stabilizes around 0.20 mmol/Ag mol for graphic‑arts films where dot quality and edge sharpness (measured via microdensitometer trace at 50x) take priority. Co‑addition with 1‑phenyl‑5‑mercaptotetrazole (0.02 mmol/Ag mol) creates a synergistic antifoggant system that maintains Dmin below 0.03 even after 7‑day incubation at 50 °C and 80% RH, a condition prescribed by ISO 18916:2007 for imaging‑media stability classification. Production trials on a curtain‑coating machine operating at 120 m/min highlight a critical processing detail: the methanolic solution of 2‑thiazolidinone must be filtered through a 0.2 µm nylon membrane immediately before injection into the emulsion‑makeup vessel, because older stock solutions slowly generate insoluble disulfide dimers visible as specks larger than 5 µm under dark‑field illumination.Acid‑stimulation treatments in carbonate reservoirs typically pump 15 wt% hydrochloric acid at injection rates of 0.5–1.5 m³/min through coiled tubing. Downhole metallurgy, predominantly API 5CT L‑80 and N‑80 carbon steel, faces general corrosion rates that can exceed 100 mm/year at bottom‑hole temperatures above 90 °C unless an effective filming inhibitor is maintained in the acid phase. 2‑Thiazolidinone, condensed with cinnamaldehyde in a 1:1 molar ratio under acid‑catalyzed conditions (glacial acetic acid, 105 °C, 3 hours), produces a Schiff‑base inhibitor that readily disperses in 15% HCl at 0.5–1.5 vol% dosage. In a standard high‑pressure autoclave test (ASTM G31 immersion, 120 °C, 4‑hour exposure, C‑1018 coupons pre‑weighed to 0.1 mg), the corrosion rate falls from 142 mm/year for uninhibited acid to 11 mm/year at 0.5 vol% and to 4.5 mm/year at 1.0 vol%. Edge‑attack and pitting depth, examined post‑test with a digital‑optical profiler, remain below 15 µm at the 1.0 vol% loading. The condensate maintains a filming persistence of >8 hours under continuous stirring at 120 °C when the acid is spent with marble chips to simulate live‑acid‑to‑spent‑acid transition down a wormhole. While the molecule does not contain phosphorus, it still meets the biodegradation threshold of OECD 301B when assessed over 28 days, allowing its use in regions where North Sea OSPAR guidelines restrict persistent organic filming agents. Field logistics require that the neat condensate be shipped as a 70 wt% concentrate in isopropanol with a pour point below ‑40 °C, diluted on‑the‑fly into the acid‑pumping stream at a rate regulated by a positive‑displacement injection pump slaved to the main frac‑blender mass‑flow meter. One operational caveat: the inhibitor film loses integrity if the return‑flow pH drops below 1.5 while the bottom‑hole temperature exceeds 135 °C, a condition encountered in deep gas wells exceeding 5500 m true vertical depth, making the formulation unsuitable for such extremes unless combined with an iodide‑salt intensifier at 0.05 wt% potassium iodide.
    Weight‑loss corrosion data in 15% HCl, C‑1018 steel, 4‑hour exposure (ASTM G31)
    Inhibitor addition (vol%) Temperature (°C) Agitation Corrosion rate (mm/yr) Surface appearance
    0.0 (control) 120 500 rpm 142 Deep pits, severe etching
    0.5 120 500 rpm 11.0 Shallow edge attack <20 µm
    1.0 120 500 rpm 4.5 Smooth, uniform etch
    1.0 + spent acid 120 500 rpm 7.8 after 8‑hour aging Minor filiform traces
    1.5 120 500 rpm 3.1 Bright, no visible attack
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    Certification & Compliance
    More Introduction

    2-Thiazolidinone, CAS 2682-49-7, is a five-membered heterocyclic building block characterized by a ring sulfur atom adjacent to a lactam carbonyl at the 2-position. Its molecular formula is C₃H₅NOS and the molar mass 103.14 g·mol⁻¹. The crystalline solid, typically supplied as a white to off-white powder, serves as a strategic intermediate in non-steroidal anti-inflammatory drug (NSAID) synthesis routes targeting the oxicam class and as a masked cysteamine equivalent in peptide conjugations. Industrial qualification processes routinely require assay values exceeding 98.0% (GC, area normalization) with residual methylene chloride or toluene below ICH Q3C Option 1 limits for pharmaceutical intermediates. A trace moisture threshold of 0.5 wt% is enforced because water ingress during downstream N-alkylation steps depresses yield by 12–18% through competitive hydrolysis of the activated imidate intermediate.

    Purity and Physical Property Benchmarks

    Typical release specifications for pharmaceutical-grade 2-thiazolidinone, lot-to-lot range based on 120 production campaigns
    PropertySpecification LimitTest Method
    Assay (anhydrous, solvent-free)98.0–101.0%GC-FID, ASTM E3009-15, HP-5 column, 30 m × 0.32 mm × 0.25 µm; injector 250 °C, oven 120 °C (2 min) to 240 °C at 15 °C/min
    Melting range49.0–52.0 °CCapillary method, ASTM E324-16; heating rate 1.0 °C/min near fusion
    Water (Karl Fischer)≤ 0.5%Coulometric KF, USP <921> Method Ia
    Residue on ignition (sulfated ash)≤ 0.1%USP <281>, 600 °C
    Individual unspecified impurity≤ 0.10%GC as above; RRT window 0.8–2.5

    Thermal gravimetric analysis under nitrogen purge at 10 K/min exhibits a single mass-loss event with onset at 175 °C, indicating that vacuum drying below 60 °C and 10 mbar preserves integrity. Sublimation propensity under dynamic vacuum at temperatures above 40 °C necessitates condenser trapping in rotary evaporator setups; bulk sublimation losses of 0.8–1.2% per hour are recorded at 50 °C and 1 mbar.

    What Factors Govern the Utility of 2-Thiazolidinone in Oxicam APIs?

    The compound’s primary industrial consumption occurs in the construction of the 4-hydroxy-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxide scaffold common to piroxicam, tenoxicam, and meloxicam. In a representative batch protocol conducted in a 2000 L glass-lined reactor equipped with a retreat-curve impeller, 87.5 kg (848 mol) of 2-thiazolidinone is N-alkylated with methyl iodide (1.05 eq.) in dimethylformamide (650 L) using ground potassium carbonate (1.5 eq.) at 25–30 °C over 8 h. The resulting N-methyl-2-thiazolidinone is isolated by drown-out into chilled water (5 °C) and centrifuged; cake purity typically reaches 99.2% after a single water slurry wash.

    Subsequent coupling with saccharin-derived methyl 4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide demands anhydrous conditions. The ester is activated with 2.0 eq. of sodium methoxide in methanol/toluene at 65 °C, generating the enolate that attacks the thiazolidinone carbonyl. Residual water above 0.3 wt% in the thiazolidinone feed shifts the reaction toward saponification of the ester starting material rather than ring-opening aminolysis. In production campaigns where thiazolidinone water content drifted to 0.7%, isolated piroxicam yield dropped from 81% to 66%, with a concomitant increase in the des-methyl impurity to 4.8 area% (HPLC, 254 nm). Therefore, the material is routinely discharged from a double-cone dryer under nitrogen sweep until on-line dew-point analysis reads ≤ -40 °C.

    A competing N- vs O-alkylation manifold is sensitive to counterion identity and solvent dielectric. The use of lithium carbonate in place of potassium carbonate in DMF promotes O-alkylation to the imidate ether, reaching 11% at 40 °C, whereas the potassium counterion restricts O-alkylation below 1.5%. This selectivity profile differentiates 2-thiazolidinone from its 4-isomer, where the tautomeric enol form is more accessible and O-alkylation typically constitutes 25–40% of the product mixture under identical conditions.

    Thermal Stability and Melt Processing Constraints

    Differential scanning calorimetry at 10 K/min reveals a sharp endotherm at 52.1 °C (peak), followed by an exothermic decomposition onset at 218 °C with an energy release of −415 J/g. Accelerating rate calorimetry (ARC) in a titanium bomb detected a self-heating threshold at 150 °C, with the time-to-maximum-rate at 180 °C measured as 35 min. These data impose strict jacket temperature limits during melt-phase reactions: external heating must not exceed 130 °C, and any bulk melt holding time above 60 °C should be kept below 4 h to avoid discoloration and crosslinking into insoluble polyamide-like residues. When the compound is used as a molten reagent for solvent-free heterocyclizations, nitrogen blanket and a 5% excess of the nucleophilic partner are recommended to scavenge liberated H₂S traces that autocatalyze decomposition.

    Cross-Reactivity with Electrophiles: A Reactivity Comparison Between 2-Thiazolidinone and 4-Thiazolidinone

    Comparative properties of positional thiazolidinone isomers
    Parameter2-Thiazolidinone (2-TZD)4-Thiazolidinone (4-TZD)
    CAS RN2682-49-72682-50-8
    Melting point49–52 °C52–54 °C
    pKa (in DMSO)12.8 ± 0.2 (NH acidity)10.2 ± 0.2 (NH acidity); enolizable α-proton ~14
    Reactivity with CH₃I/K₂CO₃/DMF at 30 °C> 95% N-methyl product in 8 h62% N-methyl, 29% O-methyl, 9% unreacted in 8 h
    Ring-opening with primary amines (n-BuNH₂, THF reflux)Complete in 3 h to thioamide-amine adduct< 10% conversion after 24 h; requires Lewis acid catalysis
    Typical pharmaceutical applicationOxicam NSAIDs, cysteine prodrugsPPARγ agonists, antidiabetic lead structures

    The distinct ring positions of the carbonyl group yield divergent reactivity profiles that dictate synthetic route selection. In 2-thiazolidinone, the lactam carbonyl is flanked by sulfur and an NH group, rendering it susceptible to nucleophilic attack at the carbonyl carbon with subsequent ring-opening — a feature exploited in the piroxicam coupling where the enolate attacks the carbonyl, triggering S–C bond cleavage and formation of the eneamide intermediate. 4-Thiazolidinone presents a carbonyl at the 4-position, conjugated with the sulfur atom through an enaminone-type system; this electronic arrangement stabilizes the ring against nucleophilic aminolysis and favors enolate chemistry at the C5 position. The 2.6-unit pKa difference in DMSO means that 2-thiazolidinone requires stronger bases for complete deprotonation, but the resulting anion displays superior N-selectivity. Additionally, 2-thiazolidinone does not form a stable thiazolidinedione oxidation product under ambient oxygen, whereas 4-thiazolidinone slowly oxidizes to 2,4-thiazolidinedione (CAS 2295-31-0) in solution, a transformation that complicates purity maintenance unless antioxidants like BHT at 50 ppm are added.

    When comparing 2-thiazolidinone to 2,4-thiazolidinedione, the absence of the second carbonyl eliminates the acidic methylene at C5 (pKa ~6.4 for 2,4-thiazolidinedione), preventing Knoevenagel condensations that are the hallmark of the dione scaffold. This makes the mono-oxo derivative a more straightforward N-functionalization substrate, whereas the dione is almost invariably used for C5-arylmethylidene chemistry in diabetes drug discovery. Process engineers selecting between the two will note that the dione’s water solubility (~12 g/L at 25 °C) is markedly higher than that of 2-thiazolidinone (~2.5 g/L), altering work-up quench volumes and waste stream miscibility.

    Field data from a toll manufacturer running parallel campaigns with 2- and 4-isomers highlighted a critical equipment incompatibility: 2-thiazolidinone sublimed during vacuum distillation recovery of DMF and coated the overhead condenser bundle, requiring a hot-water flush every 3 batches to restore heat transfer coefficients. The 4-isomer, with a lower vapor pressure and higher polarity, did not cause condenser fouling under identical distillation parameters (20 mbar, vapor temperature 72–75 °C). Consequently, 2-thiazolidinone recovery trains are retrofitted with a chilled glycol trap (−10 °C) upstream of the vacuum pump.

    Handling and Incompatibility Constraints

    Storage is mandated in sealed HDPE drums under nitrogen blanket, at 15–25 °C and relative humidity <30%. The compound reacts exothermically with strong oxidizers (sodium hypochlorite, peracetic acid) generating oxides of sulfur and carbon monoxide; mixing with chlorinating agents (thionyl chloride, oxalyl chloride) leads to violent decomposition above 40 °C. Contact with primary amines in the absence of a solvent or catalyst at ambient temperature initiates slow ring-opening with liberation of H₂S—detectable at concentrations as low as 0.5 ppm—necessitating continuous area monitoring when breaking containment. Waste destruction protocols employ alkaline hydrolysis with 2M NaOH at 60 °C for 6 h, achieving >99.9% degradation as verified by TOC analysis.

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