Process of producing a silanic or siloxanic compound containing at least one cycloalkyl ring

Claim 1

A process of producing a silanic or siloxanic compound containing at least one cycloalkyl ring by the catalytic hydrogenation of a corresponding silanic or siloxanic compound containing at least one aromatic or heteroaromatic ring having the formula (I): ##STR5## wherein: X is an aryl, alkylaryl or arylalkyl group having from 6 to 20 carbon atoms, optionally containing, in the chain or in the ring, at least one heteroatom selected from oxygen, sulphur and nitrogen and, optionally, at least one halogen atom in place of a hydrogen atom; or the radical ##STR6## wherein R 4 and R 5 , which may be same or different, are an alkylene radical containing from 1 to 20 carbon atoms, R 6 is an alkyl, alkoxyl, hydroxyalkyl, carboxyalkyl, carboxyl or ester radical containing from 1 to 20 carbon atoms, A is a heteroatom of the kind set forth above, and m, n, and p are zero or an integer ranging from 1 to 10; R 1 , R 2 and R 3 , which may be same or different, may have the same meaning as X, or may be a hydrogen atom, an alkyl, alkylene or alkoxy radical containing from 1 to 20 carbon atoms, a linear or branched alkyl radical having from 1 to 20 carbon atoms and containing one or more alkoxyl, carbonyl or carboxyl groups of an N(R 7 ) 2 group, in which R 7 is hydrogen atom or an alkyl radical containing from 1 to 20 carbon atoms, characterized in that the hydrogenation is carried out in solution, at a pressure of at least 2 bar and in the presence of a catalytic amount of Raney nickel catalyst having a granulometric distribution comprised essentially between 10 and 150 micrometers and a surface area of at least 80 m 2 /g.