Complex iron phosphaalkyne

The nature of the complexes, synthesized from metal vapor and t-BuC=P, is highly dependent upon the nature of the metal. Thus, with iron, chromium, or vanadium atoms, pentaphosphametallocenes are obtained.51 In contrast, the phosphaalkyne and molybdenum or tungsten atoms afford homoleptic tris[i74-l,3-diphosphete] metal(O) complexes [M(tj4-P2C2- -Bu2)3] (M = Mo, W).51... 

Fluoromethylidyne and Difluoromethylidene. Bismethylidyne complexes of iron are themselves somewhat rare. For example, when Lentz and co-workers first prepared nonacarbonylbis( i3-fluoromethylidyne)triiron, [Fe3(CO)9( X3-CF)2] (137), it was only the second known compound to contain the Fe3(CR)2 moiety. Since then, Lentz has extended the chemistry of this compound by studying (1) its reactions with alkynes (138-140), a phosphaalkyne (140,141), and Lewis acids (140,142), (2) its carbonyl substitution chemistry with nitriles and phosphines (143),... 

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