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US 4,052,427 AGranted
Process for the preparation of dialkyltin dihalides
AssigneeWitco Chemical Corporation
InventorsWilliam E. Leistner, Gerald H. Spiegelman, Louis J. Hover
Life of this patent
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Abstract
The preparation of dialkyltin dihalides and mixed dialkyltin dihalides, by refluxing a dimethyltin dihalide with a higher alkyl-halide in the presence of a phosphonium iodide catalyst, useful as intermediates for PVC stabilizers.
Claims11
A process for the preparation of dialkyltin dihalides of the formula:
- R R'-SnX.sub.2
- wherein R equals methyl or R';
- R' equals C.sub.2 -C.sub.20 alkyl;
- and X equals halogen;
- comprising;
- a. refluxing Me.sub.2 SnX.sub.2 and R'X in a molar ratio of about 1:1 to 1:3 in the presence of a phosphonium iodide catalyst at about 150.degree.-200.degree. C for from 1 to 50 hours and;
- b. recovering the dialkyltin dihalide product having one or more methyl group of the Me.sub.2 SnX.sub.2 replaced by R'.
4 more elements
A process for the preparation of a dialkyltin dichloride comprising,
- a. reacting methyl chloride with tin to form dimethyltin dichloride;
- b. refluxing the dimethyltin dichloride with a C.sub.2 -C.sub.20 alkyl chloride in the presence of a phosphonium iodide catalyst at about 150.degree.-200.degree. C, and;
- c. recovering the dialkyltin dichloride from the reaction products.
Dependencies are inferred from the claim text.