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Butyltin trichloride, molecular formula C₄H₉Cl₃Sn, molecular weight 282.06. It is a colorless or pale yellow liquid at room temperature, hygroscopic, and hydrolyzes rapidly in water to produce hydrogen chloride, with strong corrosiveness. It is soluble in most organic solvents, thermally stable, and readily reacts with alcohols, acids, etc. As an organotin compound, it is highly toxic and strongly irritating to the skin and mucous membranes, and should be stored sealed and dry.
| Item | Specification |
| Melting Point | -63°C (lit.) |
| Boiling Point |
93°C/10 mmHg (lit.) 226.8°C (at atmospheric pressure) |
| Flash point | 1.693 g/mL (25°C, lit.) |
| Refractive index | n²⁰/D 1.523 (lit.) |
| Vapor pressure | 0.077 mmHg (25°C) |
| LogP | 3.44 |
| Stability | Stable, but slowly hydrolyzes upon contact with water to form hydrogen chloride. |
Organic Synthesis Intermediate：As an important organotin raw material, it is used in the synthesis of various organotin compounds and serves as a key intermediate for preparing dibutyltin oxide and ester catalysts.
Plastic Additive Synthesis：Butyltin trichloride is used in the production of PVC heat stabilizers to improve the heat and light resistance of plastic products and extend their service life.
Catalyst Field：Can be used as a catalyst for organic reactions such as esterification and polycondensation, especially in the synthesis of polyurethanes and polyesters.
Surface Treatment and Corrosion Protection：Butyltin trichloride is used in metal anti-corrosion coatings and glass surface treatment agents, and also as a raw material for wood preservatives to enhance the corrosion resistance of materials.
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