Patent ID: 6462214
Filing Date: 2002-10-08
Classification: C07F

Abstract:
A method of preparing a silacycloalkane having the formula: wherein n is 1, 2, or 3, comprising the steps of:(A) adding a substituted silacycloalkane having the formula: wherein X1 is â€”F, â€”Cl, â€”Br, or â€”OR1 and X2 is X1 or H, wherein R1 is C1-C8 hydrocarbyl and n is 1, 2, or 3, to a suspension of lithium aluminum hydride in a glycol diether at a temperature not greater than 50Â° C. to form a mixture, wherein the glycol diether consists essentially of a linear arrangement of oxyalkylene units having formulae independently selected from â€”OCH2CH2â€”, â€”OCH2CH(CH3)â€”, and â€”OCH2CH(CH2CH3)â€”, and end-groups having the formulae â€”R2 and â€”OR2, wherein each R2 is independently C1-C8 alkyl, phenyl, or C1-C8 alkyl-substituted phenyl, provided the glycol diether has a normal boiling point of at least 85Â° C. and a viscosity not greater than 3000 mm2/s at 25Â° C.; and(B) distilling the mixture under reduced pressure at a temperature not greater than 50Â° C. to remove the silacycloalkane.