Methyl chlorosulphate
CAS: 812-01-1
Category: Organosulfur Compounds
| Purity | Research Grade ≥95%, High-Purity Grade ≥97%, Reagent Grade ≥90% (for synthetic use), Technical Grade |
| Molecular Formula | CH₃ClO₃S |
| Molecular Weight | 130.55 |
| Appearance | Colorless to pale yellow clear liquid |
| Packaging | 5g/10g/25g/50g/100g/500g/glass bottle or PTFE-lined glass bottle; 1kg/5kg/PTFE-lined steel drum or HDPE drum; packaged under inert atmosphere (nitrogen or argon) with tight sealing |
| Testing Indicators | Appearance — Visual inspection; Identification — FTIR (characteristic S=O stretches ~1350–1420 cm⁻¹, C-O-S stretch ~1200 cm⁻¹, C-Cl stretch ~650–800 cm⁻¹), ¹H NMR, or ¹³C NMR; Purity — GC-FID or HPLC (C18 column, UV detection at low wavelength); Assay — Titration (iodometric or acid-base after hydrolysis); Water content — Karl Fischer titration (requires specialized technique due to reactivity); Refractive index — Refractometry; Density — Hydrometer or digital densitometer; Boiling point — Distillation method (decomposes before boiling typically); Free chlorine content — Colorimetry or ion chromatography; Residual solvents — GC. |
| Storage Notes | Stored in a tightly sealed, moisture-proof container (PTFE or glass-lined) under inert atmosphere (nitrogen or argon) in a cool, dry, well-ventilated area; protected from light, moisture, and heat; away from strong oxidizers, strong bases, reducing agents, alcohols, water, and heat sources; store at 2–8°C (refrigerated) for long-term stability; handle with strict moisture control (reacts violently with water). |
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Used as a research chemical and synthetic intermediate in organic chemistry; as a chlorosulfonating and methylating agent; for the introduction of the methyl sulfate group (-OSO₂OCH₃) into organic molecules; in the synthesis of methyl sulfate esters, sulfamates, and other organosulfur compounds; as a reagent in the preparation of surfactants, dyes, and pharmaceuticals; used in methylation reactions where methyl iodide or dimethyl sulfate are less suitable; also used in the production of specialty chemicals and as a laboratory reagent.