Preparation of silanes
AssigneeBayer Aktiengesellschaft
InventorsOttfried Schlak, Hans-Heinrich Moretto
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Abstract
A process for the preparation of a silane of the formula R.sub.a SiH.sub.b (OR').sub.4-(a+b) wherein R is optionally substituted alkyl, alkenyl or aryl with up to 7 C atoms, R' is alkyl with 1 to 4 C atoms, a and b each independently is 1, 2 or 3, and a+b is at most 4, comprising reacting an Si-H polysiloxane with a compound of the formula R.sub.a Si(OR').sub.4-a in the presence of a conventional redox-stable siloxane polymerization catalyst which favors the exchange reaction. Advantageously the catalyst is AlCl.sub.3 and R and R' are methyl, ethyl, vinyl or phenyl.
Claims3
A process for the preparation of a silane of the formula
- R.sub.a SiH.sub.b (OR').sub.4-(a+b)
- wherein
- R is optionally subsituted alkyl, alkenyl or aryl with up to 7 C atoms,
- R' is alkyl with 1 to 4 C atoms,
- a and b each independently is 1, 2 or 3, and
- a+b is at most 4,
- comprising reacting an Si-H polysiloxane with a compound of the formula
- R.sub.a Si(OR').sub.4-a
- in the presence of a conventional redox-stable siloxane polymerization catalyst which favors the exchange reaction.
Dependencies are inferred from the claim text.