Abstract:
ORGANOSILICON CARBOXYLIC ACID ANHYDRIDES ARE PREPARED BY REACTING MERCAPTOSILANES OR SILOXANES WITH UNSATURATED CARBOXYLIC ACID ANHYDRIDES IN THE PRESENCE OF FREE RADICAL GENERATORS. FOR EXAMPLE, GAMMA-MERCAPTOPROPYL TRIMETHOXYSILANE IS ADDED TO NADIC METHYL ANHYDRIDE UNDER THE INFLUENCE OF AZO-BIS-ISOBUTYRONITRILE TO GIVE
Abstract:
1,217,848. Glass cloth coating with silicon compound. DOW CORNING CORP. 13 Dec., 1967 [16 Dec., 1966], No. 56541/67. Heading B2E. [Also in Division C3] Glass cloth, particularly for use in laminates, can be coated with a mercaptoaryl silicon compound of the formula: where R is a monovalent hydrocarbon radical free of aliphatic unsaturation, R' is an arylene, alkarylene or alkylene arylene radical, X is halogen, OH, alkoxy, aryloxy or acyloxy, m is 0 to 2, n is 1 to 3 and m + n cannot exceed 3.
Abstract:
The invention comprises organo-silicon compounds of the general formula RaSi[(CH2)6OH]4-a wherein a is 2 or 3, b is 3, 4 or 5 and R represents an alkyl or phenyl radical, and a process for preparing the above compounds by reacting a compound of the general formula R3SiO (CH2)bCl, wherein R represents an alkyl or phenyl radical and b has a value of from 3 to 5, with sodium, lithium or magnesium and hydrolysing the reaction product R3Si(CH2)bOM to give compounds where a is 3, or by reacting a compound of the general formula R1aSi[O (CH2)bCl]4-a, wherein R1 represents a phenyl or alkyl radical, a is 2 or 3 and b has a value of from 3 to 5, a silane of the general formula R3SiCl wherein R represents an alkyl or phenyl radical, and sodium, lithium or magnesium and hydrolysing the reaction product R1aSiO(CH2)bSiR3 to give compounds where a is 2 or 3 (and a hexaorganodisiloxane). The former reaction is preferably carried out at temperatures of 30 DEG C. and above when sodium and lithium is used, and above 55 DEG C. when magnesium is used. The group R may be the methyl, ethyl, octadecyl or phenyl radical. In the examples the following compounds are prepared by the first reaction referred to above: bis-(3-propanol - 1) dimethylsilane, 3 - trimethylsilylpropanol - 1, 4 - trimethylsilylbutanol - 1, 5 - trimethylsilylpentanol - 1, and 5 - phenyldimethylsilylpentanol-1, and the following compounds are prepared by the second reaction referred to above: 3-ethyldimethylsilylpropanol-1 and 5-ethyldimethylsilylpentanol-1 (3-ethyldimethylsilylpropoxy - 1 - ethyldimethyl silane and 5 - ethyldimethylsilylpentoxy - 1 - ethyldimethylsilane are formed as intermediate compounds respectively, and diethyltetramethyldisiloxane is also formed after the hydrolysis in each case). Specification 692,660 is referred to.