Silicon-carbon unsaturated compounds XXVII. Nickel-catalyzed reactions of 2-phenyl- and 2-(o-tolyl)-2-(phenylethynyl)hexamethyltrisilane

Article abstract of DOI:10.1016/0022-328X(90)80098-K

The nickel-catalyzed reactions of 2-phenyl- and 2-(o-tolyl)-2-(phenylethynyl)hexamethyltrisilane (I and II) with phenyl(trimethylsilyl)acetylene at 180 deg C have been examined.The reaction of I with phenyl(trimethylsilyl)acetylene in the presence of tetrakis(triethylphosphine)nickel(0) gave 1,3-diphenyl-2--1,4-bis(trimethylsilyl)-1-silacyclobut-3-ene and 1,4,4-trimethyl-1,3,6-triphenyl-2,5-bis(trimethylsilyl)-1,4-disilacyclohexa-2,5-diene.Similar reaction of II produced 3-phenyl-2--1-(o-tolyl)-1,4-bis(trimethylsilyl)-1-silacyclobut-3-ene and 4,4,5-trimethyl-2,6-diphenyl-1,3-bis(trimethylsilyl)-1-(o-tolyl)-1,4-disilacyclohexa-2,5-diene.The results of the reactions of I and II in the presence of a catalytic amount of the nickel(0) complex in the absence of phenyl(trimethylsilyl)acetylene are also described.