Silanes, process for their preparation, and their use
AssigneeCiba-Geigy Corporation
InventorsKonrad Oertle, Hansjurg Wetter
Life of this patent
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Abstract
Compounds of the formula Ia ##STR1## in which X and R.sup.1 to R.sup.6 are as defined in the claims, are obtainable by reacting monochlorosilanes of the formula II ##STR2## with tetrasubstituted ethylenes of the formula III ##STR3## X as Cl and Br can be replaced by ester groups of inorganic and organic acids. The compounds of the formula I and those with other ester groups are suitable especially as a protective-group reagent for hydroxyl, mercapto, carboxyl, amino and amide groups.
Claims9
A compound of formula I ##STR39## in which X is an ester group of an inorganic or organic acid, m is a number from 1 to 4, R.sup.1 and R.sup.2 independently of one another are linear or branched C.sub.1 -C.sub.12 -alkyl, C.sub.5 -cycloalkyl or C.sub.6 -cycloalkyl, or R.sup.1 and R.sup.2 together are tetramethylene or pentamethylene, and R.sup.3 and R.sup.5 together and R.sup.4 and R.sup.6 together are tetramethylene or pentamethylene;
- or R.sup.3 and R.sup.5 together are tetramethylene or pentamethylene and R.sup.4 and R.sup.6 are independently linear or branched C.sub.1 -C.sub.12 -alkyl, C.sub.5 -cycloalkyl or C.sub.6 -cycloalkyl;
- or R.sup.4 and R.sup.6 together are tetramethylene or pentamethylene and R.sup.3 and R.sup.5 are independently linear or branched C.sub.1 -C.sub.12 -alkyl, C.sub.5 -cycloalkyl or C.sub.6 -cycloalkyl;
- or R.sup.3 and R.sup.4 together and R.sup.5 and R.sup.6 together are trimethylene or tetramethylene;
- or R.sup.3 and R.sup.4 together are trimethylene or tetramethylene and R.sup.5 and R.sup.6 are independently linear or branched C.sub.1 -C.sub.12 -alkyl, C.sub.5 -cycloalkyl or C.sub.6 -cycloalkyl.
An improved process for the preparation of a compound of the formula Ia . ##STR40## in which X is Cl or Br, R.sup.1 and R.sup.2 independently of one another are linear or branched C.sub.1 -C.sub.12 -alkyl, C.sub.5 -cycloalkyl or C.sub.6 -cycloalkyl or R.sup.1 and R.sup.2 together are tetramethylene or pentamethylene and R.sup.3 to R.sup.6 independently of one another are linear or branched C.sub.1 -C.sub.12 -alkyl, unsubstituted or C.sub.1 -C.sub.6 -alkyl-substituted phenyl or phenyl-C.sub.n H.sub.2n -with n=1 to 6, C.sub.5 -cycloalkyl or C.sub.6 -cycloalkyl, R.sup.3 and R.sup.5 together and/or R.sup.4 and R.sup.6 together are tetramethylene or pentamethylene or R.sup.3 and R.sup.4 together and/or R.sup.5 and R.sup.6 together are trimethylene or tetramethylene, by addition of a monohalogenosilane of the formula II ##STR41## in which R.sup.1, R.sup.2 and X.sup.1 are as defined above, to a substituted ethylene in the presence of catalytic amounts of aluminium trichloride, tribromide, oxide chloride or oxide bromide, alkylaluminium dichloride, alkylaluminium dibromide or mixtures thereof at temperatures of at most 60.degree. C., wherein the improvement comprises reacting a tetrasubstituted ethylene of the formula III ##STR42## in which R.sup.3 to R.sup.6 are as defined above.
Dependencies are inferred from the claim text.