Abstract

η3-α-Silabenzyl complexes Cp*M(CO)2{η3(Si,C,C)-Si(p-Tol)3} (M = Mo (1-Mo), W (1-W)) reacted with 2-substituted pyridines NC5H4(2-EHn) (E = O, S (n = 1); N (n = 2)) under mild conditions to give M–Si–E–C–N (E = O, N), W–Si–N–C–S, and M–E–C–N (E = S, N) metallacycles depending on the metal M or heteroatom E. These three kinds of metallacycles were characterized by spectroscopy, elemental analysis, and X-ray crystallography. The first two silametallacycles take on some silylene complex character and are considered to form via (aryl)silylene complex intermediates generated by cleavage of the Si–C(aryl) bond in the η3-α-silabenzyl ligand of 1-Mo and 1-W.

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