Synthesis and reactivity of iron carbonyl complexes of α,β-unsaturated acyl silanes

Article abstract of DOI:10.1016/S0040-4020(01)90375-8

2-Trimethylsilyl-1-oxa-1,3-butadiene (7) reacts with Fe₂(CO)₉ to form an unstable tetracarbonyliron (0) complex (8) whereas 2-trimethylsilyl-4-phenyl-1-oxa- 1-oxa-1,3-butadiene (9) and 2-(tert-butyldimethylsilyl)-4-phenyl-1-oxa-1,3-butadiene (20) react with Fe₂(CO)₉ to form highly stable crystalline tricarbonyliron(0) complexes (16 and (21). Complexes (16) and (21) both undergo acylation when reacted with methyl lithium under nitrogen to form γ-ketoacylsilanes [(18) and (22)], but only complex (21) reacts with methyl lithium under carbon monoxide to give the tricarbonyl(vinylketene)iron(0) complex (23).