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US 4,052,426 AGranted
Process for the manufacture of dimethyl-tin dichloride
AssigneeCiba-Geigy Corporation
InventorsWolfgang Wehner, Rudolf Maul, Hans-Wolf Jung
Life of this patent
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Abstract
Complexes composed of alkylphosphines or of alkylphosphonium chlorides and tin tetrachloride are good catalysts for the preparation of dimethyl-tin dichloride from tin and methyl chloride in the presence of sulphones and carbonates as solvents.
Claims8
An improved process for the manufacture of dimethyl-tin dichloride by the reaction of metallic tin or tin alloys with methyl chloride at 100.degree. to 300.degree. under a pressure of 0 to 150 atmospheres gauge in the presence of at least one compound of formula I
- [r.sub.3 p(r'cl).sub.a ]SnCl.sub.4 (I)
- in which R is a straight or branched chain alkyl of 1 to 18 carbon atoms, R' has the same meaning as R or is a Cl atom and a has the value 0 or 1, wherein the improvement comprises
- carrying out the reaction in the presence of a solvent selected from the group consisting of cyclic sulfones, cyclic carbonates and cyclic thiocarbonates.
Dependencies are inferred from the claim text.