Cobalt compound useful as catalyst for hydrosilylation, dehydrogenative silylation and crosslinking of silicone compositions

A product comprising a compound C of formula (1):

• [Co(N(SiR3)2)x]y (1)
• in which:
• the symbols R, which are identical or different, represent a hydrogen atom or a hydrocarbon radical having from 1 to 12 carbon atoms,
• x=1, 2 or 3, and
• y=1 or 2,
• in the presence of a compound E of following formula (4):
• in which:
• A1, A2, A3 and A4 are chosen from:
• the hydrogen atom, alkyl groups having from 1 to 8 carbon atoms, cycloalkyl groups having from 6 to 12 carbon atoms, aryl groups having from 6 to 12 carbon atoms, halogens, and alkoxy groups of formula OR1 where R1 is an alkyl group having from 1 to 8 carbon atoms,
• A5 and A6 are chosen from:
• the hydrogen atom, alkyl groups having from 1 to 8 carbon atoms, cycloalkyl groups having from 6 to 12 carbon atoms, and aryl groups having from 6 to 12 carbon atoms, and
• A7 and A8 are chosen from:
• alkyl groups having from 1 to 8 carbon atoms, cycloalkyl groups having from 6 to 12 carbon atoms, aryl groups having from 6 to 12 carbon atoms, and alkoxy groups of formula OR1 where R1 is an alkyl group having from 1 to 8 carbon atoms
• as catalyst for hydrosilylation and/or dehydrogenative silylation between an unsaturated compound A and a compound B comprising at least one hydrosilyl functional group.

A composition X comprising:

• at least one unsaturated compound A comprising at least one alkene functional group and/or one alkyne functional group,
• at least one compound B comprising at least one hydrosilyl functional group, and
• a compound C of formula (1):
• [Co(N(SiR3)2)x]y (1)
• in which:
• the symbols R, which are identical or different, represent a hydrogen atom or a hydrocarbon radical having from 1 to 12 carbon atoms, and
• x=1, 2 or 3, and
• y=1 or 2.