Catalysts for hydrosilylation reactions

A crosslinkable organopolysiloxane composition comprising

• (1) an organopolysiloxane which contains radicals with aliphatic carboncarbon multiple bonds,
• (2) an organopolysiloxane with Si-bonded hydrogen atoms or, instead of organopolysiloxanes (1) and (2), an organopolysiloxane (3) which contains radicals with aliphatic carbon-carbon multiple bonds and Si-bonded hydrogen atoms and
• (4) a catalyst of the general formula
• MX.sub.a Y.sub.b (I)
• in which
• M is Pt, Pd, Rh, Ru, Os or Ir,
• X represents a triazene, tetrazene, tetrazadiene or pentazadiene ligand selected from the group consisting of;
• ANNNR, ANNNRR.sup.1, ANNNA.sup.1, ANR.sup.1 NNNR.sup.2 A.sup.1, ANNNNA.sup.1, ANNNR.sup.3 NNA.sup.1 and ANNNNNA.sup.1
• in which
• R represents a monovalent, optionally substituted hydrocarbon radical having 1 to 18 carbon atoms per radical or a radical of the formula --SiR.sup.6.sub.c (OR.sup.6).sub.3-c,
• R.sup.1, R.sup.2 and R.sup.3 are identical or different and represent a hydrogen atom or a monovalent optionally substituted hydrocarbon radical having 1 to 18 carbon atoms per radical, and
• A and A.sup.1 are identical or different and represent a radical of the formula ##STR7## in which G is CH or N and
• O is S, O or NH,
• R.sup.4 represents a monovalent optionally substituted hydrocarbon radical having 1 to 12 carbon atoms per radical or a radical of the formula --F, --Cl, --Br, --I, --H, --NH.sub.2, --NR.sup.6.sub.2, --NO.sub.2, --OH, --OR.sup.6, --SH, --CN, --COOH, --COCl, --CONH.sub.2, --COR.sup.6, --CHO, --SO.sub.2 NHR.sup.6, --SO.sub.3 H, --SO.sub.2 Cl or --R.sup.5 --SiR.sup.6.sub.c (OR.sup.6).sub.3-c,
• R.sup.5 represents a divalent hydrocarbon radical having 1 to 8 carbon atoms per radical,
• R.sup.6 is identical or different and represents an alkyl radical having 1 to 8 carbon atoms per radical and
• c represents 0, 1, 2 or 3,
• Y is identical or different and represents a ligand selected from the group consisting of Cl, Br, I, NH.sub.3, P(C.sub.2 H.sub.5).sub.3, P(C.sub.6 H.sub.5).sub.3, H, CO, 1,5-cyclooctadiene, pyridine, bipyridine, acetate, acetylacetonate, phenylnitrile, ethylene-diamine, acetonitrile, 2,5-norbornadiene, nitrate, nitrite, H.sub.2 O, benzene, diphenylphosphinoethane and 1,3-divinyl-1,1,3,3-tetramethyldisiloxane,
• a represents 1, 2, 3 or 4 and
• b represents 0 or an integer from 1 to 6.

A process for promoting the addition reaction between an organosilicon compound containing Si-bonded hydrogen atoms and an organic compound containing aliphatic multiple bonds which comprises reacting the organosilicon compound with the organic compound in the presence of a catalyst of the general formula

• MX.sub.a Y.sub.b (I)
• in which
• M is Pt, Pd, Rh, Ru, Os or It,
• X represents a triazene, tetrazene, tetrazadiene or pentazadiene ligand selected from the group consisting of;
• ANNNR, ANNNRR.sup.1, ANNNA.sup.1 , ANR.sup.1 NNNR.sup.2 A.sup.1, ANNNNA.sup.1, ANNNR.sup.3 NNA.sup.1 and ANNNNNA.sup.1
• in which
• R represents a monovalent, optionally substituted hydrocarbon radical having 1 to 18 carbon atoms per radical or a radical of the formula --SiR.sup.6.sub.c (OR.sup.6).sub.3-c,
• R.sup.1, R.sup.2 and R.sup.3 are identical or different and represent a hydrogen atom or a monovalent optionally substituted hydrocarbon radical having 1 to 18 carbon atoms per radical, and
• A and A.sup.1 are identical or different and represent a radical of the formula ##STR8## in which G is CH or N and
• Q is S, O or NH,
• R.sup.4 represents a monovalent optionally substituted hydrocarbon radical having 1 to 12 carbon atoms per radical or a radical of the formula --F, --Cl, --Br, --I, --H, --NH.sub.2, --NR.sup.6.sub.2, --NO.sub.2, --OH, --OR.sup.6, --SH, --CN, --COOH, --COCl, --CONH.sub.2, --COR.sup.6, --CHO, --SO.sub.2 NHR.sup.6, --SO.sub.3 H, --SO.sub.2 Cl or --R.sup.5 --SiR.sup.6.sub.c (OR.sup.6).sub.3-c,
• R.sup.5 represents a divalent hydrocarbon radical having 1 to 8 carbon atoms per radical,
• R.sup.6 is identical or different and represents an alkyl radical having 1 to 8 carbon atoms per radical and
• c represents 0, 1, 2 or 3,
• Y is identical or different and represents a ligand selected from the group consisting of Cl, Br, I, NH.sub.3, P(C.sub.2 H.sub.5).sub.3, P(C.sub.6 H.sub.5).sub.3, H, CO, 1,5-cyclooctadiene, pyridine, bipyridine, acetate, acetylacetonate, phenylnitrile, ethylene-diamine, acetonitrile, 2,5-norbornadiene, nitrate, nitrite, H.sub.2 O, benzene, diphenylphosphinoethane and 1,3-divinyl-1,1,3,3-tetramethyldisiloxane,
• a represents 1, 2, 3 or 4 and
• b represents 0 or an integer from 1 to 6,
• wherein the catalyst is activated by heating at temperatures of 50.degree. C. to 250.degree. C. and/or irradiating with light and/or adding Bronsted acids and/or acid forming agents.