2,5-Dichlorobenzo[D]Thiazole

Synthesis of 5-Chloro-2-Aminobenzo[D]Thiazole and Its Downstream Azo Dye Intermediates

Directive 2002/61/EC restricts certain azo colorants that release carcinogenic amines, and OEKO-TEX^® Standard 100 annexes enforce detection limits below 20 mg/kg per listed amine. The diazo component prepared from 2,5-dichlorobenzo[D]thiazole via ammonolysis yields 5-chloro-2-aminobenzo[d]thiazole, which remains outside the regulable amine register and is therefore compliant for spinning-dyeing polyester under REACH Annex XVII entry 43. A typical laboratory-to-pilot scale ammonolysis uses a 10:1 molar excess of 28% aqueous ammonia in isopropanol at 130–135 °C inside a Hastelloy C-276 autoclave, holding the pressure at 0.6–0.8 MPa for 8–10 h; the 5-chloro isomer is isolated by vacuum distillation at 140–145 °C/5 mmHg with >97% GC purity. Conversion of the amine to the diazonium salt is carried out in 85% phosphoric acid with nitrosylsulfuric acid at −5 to 0 °C, then coupled to N,N-diethyl-m-toluidine or N-cyanoethyl-N-benzylaniline to form disperse dyes analogous to C.I. Disperse Blue 183 and C.I. Disperse Violet 63. Molar input of the diazonium component relative to the coupler is held at 1:1.02; residual free amine after coupling must stay below 0.1% to avoid positive Fast Blue B staining in the finished dyestuff. The crude presscake is washed to conductivity below 50 μS/cm, dried in a vacuum paddle dryer at 80 °C/15 kPa, and micronized with Dispersol-type lignin sulfonate in a fluidised-bed opposed-jet mill (AFG 200) until a Malvern D_v90 ≤ 2.5 µm is achieved. Sublimation fastness tested per ISO 105-P01:1993 at 180 °C/30 s typically rates 4–5 on PET, while light fastness under ISO 105-B02:2014 (Xenon arc, Method 2) reaches 6–7 at 1/1 standard depth.

What Limits the Loading of Halo-Benzothiazole Biocides in Metalworking Fluids?

In water-dilutable metalworking fluid (MWF) concentrates, the dose window for free 2,5-dichlorobenzo[D]thiazole as a tank-side biocide is constrained on the upper boundary by emulsion destabilisation and on the lower boundary by minimum inhibitory concentration drift. The active is introduced not as a single component but as part of a pre-formulated bactericide-fungicide package where the dichlorobenzothiazole moiety typically accounts for 7–15 wt% of the package, with the balance comprising sodium pyrithione, 2-bromo-2-nitropropane-1,3-diol (Bronopol), or 1,2-benzisothiazolin-3-one (BIT). When charged into a semi-synthetic MWF containing 30–40% naphthenic base oil and 10–15% sodium petroleum sulfonate emulsifier, total package dose rates exceeding 0.3% (w/w in concentrate) cause a measurable decrease in emulsion stability; optical transmittance at 850 nm shifts by more than 15% within 48 h at 40 °C per ASTM D 3707-89(2017) oven stability protocol. Efficacy is validated against the standard challenge organisms Pseudomonas aeruginosa ATCC 9027 and Fusarium solani ATCC 36031 in accordance with ASTM E 2169-17 (Practice for Selecting Antimicrobial Pesticides for Use in Water-Miscible Metalworking Fluids); a log₁₀ reduction ≥ 5.0 within 7 days is routinely required by large aerospace machining operations referencing SAE ARP 5660. The production blending sequence uses a side-entry high-shear disperser (rotor tip speed 18–22 m/s) at ≤ 35 °C to incorporate the benzothiazole active without triggering dehydrohalogenation that would liberate chloride ions and accelerate sump corrosion. Finished MWF concentrates supplied to centralised coolant systems in automotive transfer lines are applied at 5–7% dilution, bringing the in-sump dichlorobenzothiazole concentration to 35–70 ppm. Regulatory compliance under the EU Biocidal Products Regulation (BPR) for product-type 13 necessitates a half-life in ready biodegradability testing (OECD 301C) exceeding 28 days, which is met by the parent molecule but requires careful surfactant selection to avoid enhanced solubilisation that would push the log K_ow estimate below 3.5.

Leather Wet-Blue Preservation via Thiocyanomethylthio Intermediate Synthesis

2,5-Dichlorobenzo[D]thiazole is the key building block for generating 2-(thiocyanomethylthio)-5-chlorobenzo[d]thiazole, a structural congener of TCMTB classified under BPR product-type 9 (leather preservation). The synthesis involves nucleophilic substitution of the 2-chloro substituent with potassium thiocyanate in acetone/water (4:1 v/v) at reflux, requiring 1.05 equivalents of KSCN and catalytic tetrabutylammonium bromide at 0.5 mol%. The reaction mass is held at 56–58 °C for 6 h until GC monitoring shows residual starting material ≤ 0.5 area%; subsequently chloromethyl thiocyanate, generated in situ from chlorobromomethane and potassium thiocyanate in the same pot, is dropped in at 0–5 °C to install the thiocyanomethylthio motif. Overall isolated yield after vacuum distillation (170–175 °C/2 mmHg) is typically 76–82% with a purity of ≥98.5% by qNMR. In the beamhouse, the resulting biocide is formulated as a 25% active emulsifiable concentrate (EC) using castor oil ethoxylate (HLB 13.5) and diluted in float to deliver an application concentration of 0.15–0.25% (w/w on wet-blue weight) during the pickle or wet-blue storage bath. The critical performance metric is the absence of red-heat discoloration on the grain after 60 days of tropical chamber storage at 35 °C/85% RH, evaluated by IULTCS/IUC 18:2001. A pitfall repeatedly encountered on commercial raceway drums is precipitation of the active when bath pH exceeds 4.5 due to carryover of lime; therefore process SOPs mandate a formic acid pre-acidification step to pH 3.2–3.5 before biocide addition. EPA registration under FIFRA section 3 for this end-use requires the aquatic toxicity endpoint LC₅₀ (Oncorhynchus mykiss, 96 h) to be above 1 mg/L, satisfied when the formulated EC is applied within the specified concentration window. Downstream tanneries delivering wet-blue to automotive upholstery specifications additionally verify extractable chlorophenol content below the 0.5 ppm threshold of IULTCS/IUC 19.

When Sulfenamide Accelerator Synthesis Requires a Dichloro-Benzothiazole Precursor

5-Chloro-2-mercaptobenzo[d]thiazole, derived from 2,5-dichlorobenzo[D]thiazole by selective sodium hydrosulfide displacement in ethanol at 78 °C, serves as the mercaptan feedstock for delayed-action sulfenamide accelerators analogous to N-morpholinylthiobenzothiazole. The oxidative coupling with morpholine is run in a jacketed glass-lined reactor equipped with a turbine agitator; a 20% aqueous sodium hypochlorite solution is metered at a rate that keeps the internal temperature within 0–5 °C while maintaining a stoichiometric ratio of NaOCl to mercaptan of 1.08:1.00. Departure from this temperature window by more than ± 3 °C triggers an irreversible precipitation of irregular polysulfidic by-products that lowers the melting point of the finished sulfenamide below the required 80–85 °C and fouls the discharge lobe pump. The filtered accelerator is dried in a conical vacuum dryer at 55 °C/10 mbar to a moisture content ≤ 0.15% (Karl Fischer). In a typical natural rubber (SMR CV 60) truck tyre tread compound, the accelerator is dosed at 1.0–1.3 phr alongside 2.5 phr sulfur and 0.3 phr N-cyclohexylthiophthalimide (CTP) retarder. Cure kinetics measured on a moving-die rheometer (MDR 2000) at 160 °C per ISO 6502:2020 show a scorch time t_s2 of 3.8–4.5 min and t₉₀ of 9.2–10.1 min, providing a processing safety margin adequate for multi-stage truck tyre building. Tensile properties after optimal cure are tested in accordance with ISO 37:2024 using dumb-bell type 2 specimens; modulus at 300% elongation typically falls in the range 10.5–11.8 MPa, while elongation at break is maintained above 480%. REACH compliance for the accelerator as an imported article requires that free 5-chloro-2-mercaptobenzo[d]thiazole, listed as a skin sensitiser 1B (H317), remain below 0.1% w/w in the technical grade, verified by HPLC-UV at 254 nm using a C18 column.

Preparation of a boronic ester derivative via palladium-catalyzed borylation of 2,5-dichlorobenzo[D]thiazole represents a standard entry point into benzothiazole-containing kinase inhibitor scaffolds that target the ATP-binding pocket of FLT3 or VEGFR-2 receptors. The route follows the guidance of ICH Q7A (Good Manufacturing Practice for Active Pharmaceutical Ingredients) and ICH Q11 for starting material designation; the regioisomeric purity of the dichlorobenzothiazole used must be supported by a certificate of analysis demonstrating ≥99.0% GC area and the absence of the 2,6- and 4,5-dichloro isomers above 0.15% each, as these would propagate into isomeric impurities difficult to purge by recrystallisation. In a multi-kilogram campaign, the borylation employs bis(pinacolato)diboron (1.15 eq), potassium acetate (3.0 eq), and Pd(dppf)Cl₂·CH₂Cl₂ (0.5 mol%) in 1,4-dioxane at 85–90 °C with a hold time of 14–18 h under nitrogen blanket. The catalytic turnover is sensitive to the water content of the dioxane; KF titration must read below 200 ppm to avoid protodeborylation that would revert the boronic ester to the parent benzothiazole. After Celite filtration and solvent swap to heptane, the 2,5-disubstituted intermediate crystallises with an isolated yield of 72–78% and HPLC purity >99.5 area%. This intermediate is then advanced through Suzuki-Miyaura coupling with 4-(4-methylpiperazin-1-ylmethyl)phenylboronic acid pinacol ester under aqueous Na₂CO₃/toluene/ethanol at 75 °C to produce the clinical candidate precursor. Residual palladium in the API intermediate is controlled to ≤ 10 ppm by an n-acetylcysteine scavenger treatment, complying with the ICH Q3D Elemental Impurities guideline for an oral dosage form with a daily intake not exceeding 100 mg. The ultimate dosage form is a film-coated tablet containing the 50 mg free base equivalent, manufactured by direct compression using a rotary press with 25 kN main compression force, meeting USP <711> dissolution criteria at 30 min in 0.1 N HCl.

Copper-Triazole-Dichlorobenzothiazole Wood Preservative Systems

In ammoniacal copper quat (ACQ) or micronized copper azole (MCA) formulations, 2,5-dichlorobenzo[D]thiazole acts as a co-biocide that extends the spectrum of protection against copper-tolerant soft-rot fungi, particularly Chaetomium globosum and Phialophora mutabilis. The molecule is incorporated into treating solutions at 0.5–1.2% (w/w active ingredient) relative to the total solution weight, while copper is present as copper carbonate equivalent at 0.9–1.8%, meeting the compositional limits set by AWPA P5-20 (Standard for Waterborne Preservatives). A full-scale pressure treatment cycle for Southern Yellow Pine (Pinus spp.) poles follows AWPA T1-22 using an initial vacuum of −85 kPa for 30 min, pressure at 1.0–1.2 MPa for 90–120 min, and a final vacuum of −90 kPa for 45 min. Net retention of the dichlorobenzothiazole active in the assay zone (outer 15 mm of the sapwood) is determined by x-ray fluorescence or GC-MS after toluene extraction and must average 0.05–0.08 kg/m³ for ground-contact Use Category UC4B in accordance with AWPA U1-22. The following table compiles comparative median decay ratings from a five-year stake test (AWPA E7-21, Saucier, Mississippi) for matched formulations.

Table 1: AWPA E7-21 Decay Ratings for Copper-Amine Formulations After 5-Year Ground Contact

Formulation (active ratio Cu:co-biocide)

Retention (kg/m³ Cu)

Retention (kg/m³ co-biocide)

Median Rating (0–10)

Soft-Rot Failure Mode (%)

2.0% Cu(OH)₂·CuCO₃ only

1.60

–

5.2

Cu-azole reference (tebuconazole:propiconazole 1:1)

0.95

0.12

8.1

Cu-Dichlorobenzothiazole 7:1 (w/w active)

0.96

0.14

8.4

Formulators operating under EU Biocidal Products Regulation for product-type 8 must demonstrate that the leachate from treated wood exposed to simulated rain (CEN/TS 15119-1) contains less than 0.05 μg/L of the parent dichlorobenzothiazole to meet the predicted no-effect concentration for freshwater sediment. This necessitates the addition of a tertiary amine oxide fixation promoter at 0.3–0.5% and a post-treatment kiln-drying step at 65 °C dry-bulb for a minimum of 72 h to drive the complexation reaction with wood carboxylate groups to completion. Accelerated above-ground testing according to AWPA E16-22 (L-joint, 18 months) reveals that the copper-dichlorobenzothiazole combination reduces the percentage of end-joint decay failures to ≤5%, compared with 18% for copper-quat systems without the benzothiazole supplement, while maintaining a corrosion rate on hot-dip galvanized fasteners (ASTM G 71-81) below 15 µm/year.

The heterocyclic scaffold 2,5-dichlorobenzo[d]thiazole (CAS 2942-15-6) is delivered as a crystalline solid with a purity specification anchored at ≥98.0% (HPLC, area normalization, detection at 254 nm). The commercial lot release sheet routinely reports an assay window of 98.2–99.1% when analysed against an internal reference standard traceable to a certificate of analysis from a contract manufacturing organization operating under ISO 9001:2015. Differential scanning calorimetry under nitrogen purge at 10 K/min reveals a sharp melting endotherm with onset at 64.5 ± 1.0 °C, while residual solvent headspace GC-MS according to USP ⟨467⟩ procedure A confirms residual toluene below 80 ppm and residual N,N-dimethylformamide below 100 ppm in the micronized grade.

The product is available in three physical grades: a standard crystalline powder, a micronized form (D₉₀ 25 µm, laser diffraction per ISO 13320:2020), and a pre-sieved granular cut (40–60 mesh) intended for fixed-bed continuous flow reactors. Each grade is double-bagged in anti-static Type C polyethylene under argon, with a specified shelf-life of 24 months when stored at 2–8 °C and protected from light; deviation beyond 30 °C for more than 72 hours has been observed in stability studies to increase the concentration of the disulfide dimer to above 0.15%, a threshold that compromises downstream amination selectivity.

What Limits Nucleophilic Displacement at the C2 Position?

The chlorine atom occupying the 2-position of the thiazole ring exhibits electrophilicity comparable to that of an activated heteroaryl chloride, enabling facile S_NAr substitution with primary and secondary amines, alkoxides, and thiols. In a production-scale campaign documented on a 500 L glass-lined reactor equipped with a retreat-curve impeller, displacement with N-Boc-piperazine in refluxing tetrahydrofuran proceeded to 99.1% conversion within 4.5 hours when the charge ratio was maintained at 1.05 equivalents of amine relative to the dichloride. However, the presence of the 5-chloro substituent on the benzo ring significantly attenuates the reaction rate when electron-donating amines are employed: switching to 4-methoxybenzylamine increased the required reflux duration to 11 hours under otherwise identical conditions, as measured by inline ReactIR monitoring of the C–Cl absorption band at 1035 cm⁻¹.

A documented process failure at pilot scale highlights the incompatibility of this intermediate with unprotected primary amines bearing acidic α-protons. An attempted telescoped amination–cyclization sequence using glycine methyl ester hydrochloride and triethylamine as the acid scavenger resulted in rapid formation of a black intractable tar, attributed to a base-induced ring-opening of the thiazole followed by oligomerization. Mitigation required pre-neutralization of the amino ester in a separate vessel and slow counter-addition at −5 °C, maintaining the internal temperature within a ±3 °C deadband. Published data for the analogous reaction using 2-chlorobenzothiazole as substrate shows a significantly wider thermal operating window, underscoring the activating influence of the 5-chloro group on decomposition kinetics.

Vulcanization Accelerator Intermediate Chemistry — A Narrow Processing Corridor

While 2-mercaptobenzothiazole (MBT) and its sulfenamide derivatives dominate the rubber accelerator market, 2,5-dichlorobenzo[d]thiazole serves as a precursor to a specialty class of delayed-action accelerators in which the C2 chlorine is displaced by a sulfenamide moiety bearing a sterically hindered amine. The incorporation of the electron-withdrawing chlorine at C5 shifts the vulcanization activation energy, as measured by moving-die rheometer isotherms at 160 °C according to ASTM D5289-19a, such that the scorch time (t_s2) is extended by 2.7 minutes relative to the unsubstituted benzothiazole sulfenamide baseline. This processing advantage is only realized when the residual free chlorine content of the precursor is below 0.05 wt%; otherwise, acidic residues prematurely cleave the sulfenamide bond, negating the scorch delay.

Comparative Vulcanization Parameters in Model Tire Belt Skim Compound (NR/BR 70/30, carbon black N330 50 phr)
Accelerator Precursor	t_s2 at 160 °C (min)	t₉₀ (min)	Crosslink Density (×10⁻⁵ mol/cm³)	ΔTorque (dNm)
Unsubstituted benzothiazole sulfenamide precursor	4.1	8.9	12.4	18.2
2,5-Dichlorobenzo[d]thiazole-derived sulfenamide	6.8	11.3	13.1	19.5

The data illustrate that the 2,5-dichloro substitution pattern increases the processing safety window without sacrificing final crosslink density. However, the manufacturing route demands rigorous removal of any adventitious sulfur nucleophiles; even trace hydrogen sulfide in bulk carbon disulfide feedstock leads to irreversible formation of a benzothiazole-2-thione byproduct that co-crystallizes with the target compound, necessitating a re-slurrying purification step that reduces overall yield by 6–8%.

Where the 2,5-Dichloro Isomer Outperforms the 2,6- and 2,7-Dichloro Congeners

The isomeric series of dichlorobenzo[d]thiazoles — including the 2,4-, 2,5-, 2,6-, and 2,7-dichloro variants — presents a set of distinct electronic environments that govern reactivity in cross-coupling and cyclization sequences. The 2,5-dichloro substitution pattern, wherein the chlorine atom on the homocyclic ring is para to the benzothiazole nitrogen, results in a modestly electron-deficient benzo ring (Hammett σ_m for Cl ≈ +0.37). This arrangement facilitates regioselective lithiation at the sterically unencumbered 4-position using lithium diisopropylamide at −78 °C, an approach that is severely compromised in the 2,4-dichloro isomer because of competing deprotonation at both the 4- and 7-positions.

In palladium-catalyzed Suzuki–Miyaura coupling, the 2,5-dichloro scaffold demonstrates a useful chemoselectivity gradient: the electron-poor thiazole C2–Cl undergoes oxidative addition with Pd(PPh₃)₄ at a rate approximately 5- to 8-fold faster than the benzo C5–Cl under typical conditions (toluene/ethanol/water, K₂CO₃, 80 °C). Practitioners exploit this kinetic preference to install a first aryl substituent exclusively at C2, leaving the C5–Cl available for a subsequent Buchwald–Hartwig amination. In contrast, the 2,6-dichloro isomer exhibits a less discriminating reactivity profile, often yielding 10–15% of the doubly coupled product even under carefully controlled mono-addition conditions. The difference is attributed to the diminished resonance withdrawal by the 6-chloro substituent, which occupies a meta position relative to the ring-junction nitrogen.

A structural consideration distinct from the other dichloro isomers is the crystallographic habit. Single-crystal X-ray diffraction of 2,5-dichlorobenzo[d]thiazole (orthorhombic, space group P2₁2₁2₁) reveals a non-planar packing geometry in which the heterocyclic ring adopts a slight boat conformation, whereas the 2,6- isomer crystallizes in a planar monoclinic system. This difference substantially impacts the mechanical properties of the bulk solid: the specific surface area accessible to nitrogen adsorption varies by a factor of 3.2 between the two isomers, directly influencing dissolution rate in aprotic solvents during large-scale bromination or nitration steps downstream.

Pharmacopoeial Control and Impurity Fate Mapping

The specification dossier for 2,5-dichlorobenzo[d]thiazole intended for pharmaceutical intermediate service includes a dedicated impurity profile that tracks process-related contaminants arising from the typical synthetic route — chlorination of 2-chlorobenzothiazole using N-chlorosuccinimide in acetic acid. The primary impurity is 2,5,6-trichlorobenzo[d]thiazole, typically controlled at ≤0.30% via HPLC. A secondary impurity, 2,5-dichlorobenzo[d]thiazole-6-sulfonic acid, generated when carryover sulfuric acid from a preceding nitration/quench step is present, is limited to ≤0.10%. A dedicated limit test using ion chromatography with conductivity detection provides a sulfate specification of ≤80 ppm in the dried product. These limits are verified against reference standards produced according to a qualification protocol that complies with ICH Q7 for Good Manufacturing Practice for active pharmaceutical ingredients.

Failure to control the trichloro impurity below 0.50% has been directly linked, in at least one publicly available process development report, to the formation of a genotoxic dimer during a subsequent nitro reduction step. The trimerization byproduct, a dipyrido-fused heterocycle, was detected by high-resolution mass spectrometry in the crude reaction mixture at 23 ppm, leading to a costly additional flash chromatography purification that could have been avoided through tighter front-end chlorination selectivity control. To mitigate this risk, three commercial suppliers now offer a “pharma-grade” specification with a trichloro impurity limit of 0.15% and an elemental nickel screen (ICP-MS) below 10 ppm to satisfy ICH M7(R2) requirements for mutagenic impurity risk assessment.

Typical Impurity Profile — Pharma Grade 2,5-Dichlorobenzo[d]thiazole (Lot Analysis, n=12)
Impurity	Specification (max. %)	Mean Lot Value (%)	Analytical Method
2,5,6-Trichlorobenzo[d]thiazole	0.15	0.09	HPLC 254 nm, C18 150×4.6 mm, ACN/water gradient
Disulfide dimer	0.20	0.11	HPLC 254 nm, same condition
Sulfonic acid derivative	0.10	0.02	IC, Metrosep A Supp 5 column
Any single unspecified impurity	0.10	—	HPLC 254 nm / GC-FID

Handling and Incompatibilities in Multi-Purpose Plant Environments

Operators equipped with powered air-purifying respirators (PAPR) and Viton/butyl laminate chemical gauntlets handle the material under an inert nitrogen blanket when opening drums in a humidity-controlled isolator maintained at ≤30% RH. The compound is classified as a skin sensitizer (GHS Category 1) and eye irritant (Category 2). Dedicated stainless steel (316L) charge chutes with a conductive polymer lining prevent static discharge and cross-contamination with residual bases from previous campaigns. Any incidental contact with alkaline cleaning solutions must be strictly prevented; a documented incident in which a rinsate containing sodium hydroxide (0.1 M) reacted with residual product trapped in a diaphragm valve cavity resulted in exothermic polymerization that deformed the PTFE diaphragm and necessitated an unscheduled line shutdown of 18 hours.

Advantage Over 2-Chlorobenzothiazole in Late-Stage Diversification

Direct comparison of 2,5-dichlorobenzo[d]thiazole with its mono-chloro analogue, 2-chlorobenzothiazole, in a fragment-based drug discovery campaign highlights the strategic value of the second chlorine. The presence of the 5-chloro substituent not only modulates the lipophilicity (calculated clogP increases from 2.51 to 3.10) but also provides a non-exchangeable handle for metabolic blocking. A matched molecular pair analysis conducted on a kinase inhibitor series revealed that the 2,5-dichloro analogue exhibited a 2.3-fold improvement in human microsomal half-life (from 23 to 53 minutes) compared to the unsubstituted phenyl derivative, while retaining on-target pIC₅₀ potency within 0.2 log units. This metabolic stabilization is attributed to suppression of CYP2C9-mediated oxidation at the benzo ring, a pathway that generates reactive epoxide intermediates for the dechlorinated scaffold.

In continuous flow hydrogenation, a feedstock solution of 2,5-dichlorobenzo[d]thiazole in tetrahydrofuran (0.2 M) exhibits 2.8 times longer catalyst lifetime over 5% Pd/C packed in a H-Cube Pro reactor when compared to 2,6-dichlorobenzo[d]thiazole under identical conditions (30 bar H₂, 50 °C, residence time 120 s). The differential is directly correlated with reduced leaching of chloride ions, which poison the palladium surface, as confirmed by ion chromatography of the reactor effluent showing free chloride concentrations below 2 mg/L for the 2,5-isomer versus 11 mg/L for the 2,6-isomer. This operational advantage translates to an extended campaign length from 8 hours to 23 hours before the catalyst bed requires regeneration.

HS Code	933255
Chemical Formula	C7H3Cl2NS
Molecular Weight	204.08
Appearance	Solid (usually a powder or crystalline solid)
Physical State At Room Temp	Solid
Melting Point	Typically in a certain range (specific value may vary based on purity)
Solubility In Water	Low solubility in water
Solubility In Organic Solvents	Soluble in some organic solvents like dichloromethane, chloroform
Odor	May have a characteristic, somewhat pungent odor
Stability	Stable under normal conditions, but may react with strong oxidizing agents

Packing	500g of 2,5 - Dichlorobenzo[D]Thiazole packaged in a sealed plastic bag.
Shipping	2,5 - Dichlorobenzo[D]Thiazole is shipped in accordance with strict chemical regulations. It is packaged securely in appropriate containers to prevent leakage, and transported by approved carriers following safety protocols for hazardous chemicals.
Storage	2,5 - Dichlorobenzo[D]Thiazole should be stored in a cool, dry, well - ventilated area, away from heat sources and direct sunlight. Keep it in a tightly closed container to prevent moisture and air exposure. Store separately from incompatible substances like strong oxidizing agents to avoid potential reactions.