Method of preparing trialkyl-tin hydrides
AssigneeWitco Corporation
InventorsRalf-Jurgen Becker, Ulrich Stewen, Udo Weinberg
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Abstract
The invention concerns a method of preparing trialkyl-tin hydrides by a process that ensures outstanding long-term stability. Bis-[trialkyl-tin]oxides are dissolved in a solvent that mixes only to some extent, if at all, with water and converted with an aqueous solution of sodium borohydride stabilized with a base. The product is obtained by phase separation and optionally by distillation. The trialkyl-tin hydride is obtained almost quantitatively with a yield of more than 95%.
Claims13
A method of preparing trialkyl-tin hydrides of the general formula R.sub.1 R.sub.2 R.sub.3 SnH, wherein R.sub.1, R.sub.2, and R.sub.3 are the same or different branched and/or unbranched and/or substituted alkyls having from about 1 to about 18 carbon atoms, comprising the steps of:
- a) reducing bis-[trialkyl-tin]oxide with a stabilized aqueous solution of sodium borohydride in the presence of an inert solvent that mixes only to some extent, if at all, with water,
- b) maintaining the reaction temperature between about 0.degree. and about 140.degree. C.,
- c) allowing the batch to stand for about 0 to about 3 hours subsequent to separation thereof,
- d) separating the organic from the aqueous phase, and
- e) obtaining the product by distilling the solvent off.
Dependencies are inferred from the claim text.