Reactions of metal carbonyl derivatives. Part 25. The bridging properties of tetraethyl diphosphite, (EtO)2POP(OEt)2

Abstract

The ditertiary phosphite (EtO)₂POP(OEt)₂(tedip) has been treated with a variety of metal carbonyl complexes such as [Mo(CO)₆], [Mo(CO)₄(C₇H₈)](C₇H₈= bicyclo[2.2.1] heptadiene), [Mo(η-C₅H₅)(CO)₃X](X = Cl, Br, or I). [Fe₂(CO)₉], [Fe₃(CO)₁₂], [{Fe(CO)₃(SMe)}₂], and [Fe(η-C₅H₅)(CO)₂l], and in all cases products in which the phosphite is bonded unidentate or bridged bidentate have been obtained. These included [Mo(CO)₄(tedip)₂], [{Mo(η-C₅H₅)(CO)₂X}₂(tedip)], [Fe₂(CO)₇(tedip)], [Fe₂(CO)₅(tedip)₂], [{Fe(CO)₂(SMe)}₂(tedip)], and [{Fe(η-C₅H₅)(CO)l}₂(tedip)]. The apparent inability of this ligand to afford chelated products is discussed in terms of the tedip bond angle.