η-Tetraphenylphospholyl and η-tetraphenylarsolyl derivatives of manganese, rhenium, and iron

Abstract

The tetraphenyl-phospholyl and -arsolyl complexes of manganese and rhenium [M(CO)₅(σ-EC₄Ph₄)](E = P or As, M = Mn or Re) lose carbon monoxide on heating to yield the corresponding η-phospholyl and η-arsolyl complexes [M(CO)₃(η-EC₄Ph₄)]. These products are also obtained by loss of carbon monoxide from the dimers [{Mn(CO)₄(EC₄Ph₄)}₂], the action of Ph₄C₄E–EC₄Ph₄(E = P or As) upon [Mn₂(CO)₁₀], and by the action of tetraphenyl-1-trimethylsilylarsole upon [Mn(CO)₅Cl]. Triphenylphosphine, diphenylacetylene, and the nitrosyl cation all displaced one carbonyl group from the complex [Mn(CO)₃(η-AsC₄Ph₄)]. Prolonged heating of the iron complexes [Fe(CO)₂(η-C₅H₅)(σ-EC₄Ph₄)](E = P or As) caused loss of carbon monoxide and production of the corresponding phospha- and arsa-ferrocenes [Fe(η-C₅H₆)(η-EC₄Ph₄)].