Hydrosilylierung von symmetrisch disubstituierten Alkinen und Butadiinen mit L2Ni(0)-Butadiin-Komplexen [L Ph3P, (o-Tol-O)3P] als Katalysatoren
作者:A. Tillack、S. Pulst、W. Baumann、H. Baudisch、K. Kortus、U. Rosenthal
DOI:10.1016/s0022-328x(96)06734-4
日期:1997.4
The hydrosilatation of Pr-n-C=C-Pr-n, Ph-C=C-Ph, Me3Si-C=C-SiMe3, Ph-C=C-C=C-Ph, Bu-t-C=C-C=C-Bu-t and Me3Si-C=C-C=C-SiMe3 with Ph2SiH2, PhMe2SiH and Et3SiH in the presence of L2Ni(0)-butadiyne catalysts [L = Ph3P, (o-Tol-O)(3)P] has been studied. In all cases the hydrosilylation proceeds via a cis-addition of the silanes. The disubstituted alkynes (Pr-n-C=C-Pr-n, Ph-C=C-Ph) give hydrosilylated ethene, butadiene and hexatriene derivatives as well as non-hydrosilylated benzene derivatives. In the case of Me3Si-C=C-SiMe3 no reaction was observed. The hydrosilylation of disubstituted butadiynes proceeds stepwise to give at first the 1,2-adducts. In dependence on the butadiynes either a 1,4-addition (Bu-t-C=C-C=C-Bu-t, Me3Si-C=C-C=C-SiMe3) to the corresponding allene derivatives (11, 13, 15) or a 3,4-addition (Ph-C=C-C=C-Ph) to the 1,3-butadiene 19 takes place subsequently. The reaction products were characterized by mass spectrometry, IR and NMR spectroscopy.