结构式
CAS: 867-44-7
分子式: C2H6N2S·0.5H2SO4
结构式: [CH2SC(=NH)NH2]2·H2SO4
分子量: 140.19
中文名称: S-甲基异硫脲硫酸盐
英文名称: 2-methyl-2-thio-pseudoure sulfate
carbamimidothioic acid, methyl ester, sulfate
s-methylisothiuronium sulfate
性质描述: 针状结晶。熔点244℃（分解）。能溶于热水，不溶于醇。其游离基S-甲基异硫脲[2986-19-8]不能单离；其盐酸盐[53114-57-1]熔点为59-60℃。
制备：是将硫脲加入反应器中加入少许水，在搅拌情况下使硫脲部分溶解，冷水浴冷却下搅拌10min，再加入重蒸的硫酸二甲酯，迅速安装上两根球形冷凝管，以防暴沸，撤去冷水浴，反应自发进行放热，5min后突然暴沸，此时固体已大部分溶解，待回流减弱并平衡后，加热再回流1h，静置过夜，反应物固化，加入95％乙醇搅拌片刻，冰水冷却0.5h，过滤，用25％乙醇洗涤得成品。
用途: 该品为有机合成的中间体。医药工业用于生产抗癌药物5-氟脲嘧啶、丙脒腙、硫酸羟胍，降压药胍氯酚等；农药工业用于生产杀菌剂多菌灵、苯菌灵及杀虫剂甲基嘧啶磷等。
英文版安全技术说明书
Product Identification
【Product Name】2-Methyl-2-thiopseudourea sulfate
【Synonyms】S-Methylisothiourea hemisulfate；S-甲基异硫脲硫酸盐
【CAS】867-44-7
【Formula】C4H14N4O4S3
【Molecular Weight】278.37
【EINECS】212-759-7
【RTECS】UM9200000
【RTECS Class】Drug
【Beilstein/Gmelin】3917217
【Beilstein Reference】4-03-00-00358
【EC Class】harmful
Physical and Chemical Properties
【Appearance】White solid.
【Solubility in water】260 g/L (20℃)
【Melting Point】240 - 241℃
【Density】1.28 g/cm3 (20℃)
First Aid Measures
【Ingestion】If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
【Inhalation】Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
【Skin】Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
【Eyes】Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.
Handling and Storage
【Storage】
Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
【Handling】Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.
Hazards Identification
【Ingestion】May cause digestive tract disturbances.
【Inhalation】May cause respiratory tract irritation.
【Skin】May cause skin irritation.
【Eyes】May cause eye irritation.
【EC Risk Phrase】R 22
【EC Safety Phrase】S 22 36/37
Exposure Controls/Personal Protection
【Personal Protection】Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
【Respirators】Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Fire Fighting Measures
【Fire Fighting】Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam.
Accidental Release Measures
【Small spills/leaks】Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stability and Reactivity
【Disposal Code】3
【Stability】Stable under normal temperatures and pressures.
【Incompatibilities】Strong oxidizing agents.
【Decomposition】Nitrogen oxides, carbon monoxide, oxides of sulfur, carbon dioxide, nitrogen.
Transport Information
【HS Code】2930 90 70
