Abstract: An elastomer-forming silicone composition comprising (A) a vinyl-organopolysiloxane, (B) an organosilicon compound, (C) a noble metal catalyst and (D) an adhesion promoter characterised in that the adhesion promotor is the product of the mixture or reaction of (1) an organosiloxane compound having at least two trialkoxysilyl groups, (2) an unsaturated alcohol having at least one .alpha.,.beta.-unsaturated alkenyl group and has improved adhesion without the toxic disadvantages of the prior art.

Abstract: A composition comprising a complex of a Cu(II) salt formed from copper or a copper salt, an organosilicon compound having at least one Si-bonded group which include 2 amino nitrogens which may enter into a heterocyclic ring structure with Cu and 2 to 5 carbon atoms linking the N atoms, and water in the presence of oxygen, is useful as a catalyst for oxidative coupling reactions of certain silicon compounds. Formulations comprising up to 5 parts of the above composition and 100 parts of either arylolsilicon compounds or arylcyanophenylacetylsilicon compounds are particularly claimed.