New Route to 1,4-Disilabenzenes and 1,4-Disilabarrelenes

摘要

Heating bi(7-silanorboranadien-7-yl) 4 with diphenylacetylene at 350 C produces 1,4-disilabarrelene 6a. The x-ray crystal structure of 6a is reported. Thermolysis of 4 in the presence of 3-hexyne also produces small amounts of the corresponding 1,4-disilabarrelene. Mechanisms for the formation of these products are proposed; the probable immediate precursor is a 1,4-disilabenzene. silanes, boranes, dienes, Reprints. (mgm)