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US 4,539,418 AGranted
Method for the preparation of pentamethylcyclotrisiloxane
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsToshio Takago, Masatoshi Arai
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Abstract
A very efficient method is proposed for the synthetic preparation of pentamethylcyclotrisiloxane by the ring-closing reaction between 1,1,3,3-tetramethyl-1,3-dihydroxy disiloxane and a methyl dialkenyloxysilane such as methyl diisopropenyloxysilane at a moderate temperature in a solution with an organic solvent.
Claims4
A method for the synthetic preparation of pentamethylcyclotrisiloxane which comprises:
- admixing 1,1,3,3-tetramethyl-1,3-dihydroxy disiloxane and a methyl dialkenyloxysilane represented by the general formula ##STR7## in which R.sup.1 is an alkyl group having from 1 to 4 carbon atoms and R.sup.2 is a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms to effect ring-closing reaction.
Dependencies are inferred from the claim text.