Cobalt aminophosphine complexes

Since Wymore and Bailar (1) first prepared trans-[CoX2 l,2-bis (diethylphosphino)ethane ]X (X = Cl-, Br , and I-) in I960, many cobalt(III)-phosphine complexes have been reported (2). However, no optically active cobalt(III)-phosphine complex has ever been prepared. This paper deals with the preparation, characterization and circular dichroism (CD) spectra of octahedral cobalt(III) complexes containing aminophosphines of the type,... 

Co(aminophosphine)2(C104) 2) was obtained by evaporating the methanol under reduced pressure. It was dissolved in CH2Cl2 and chlorine was bubbled through the solution to oxidize the cobalt-(II) ions. After evaporation to dryness, the crude complex was recrystallized from methanol and water to give green crystals. 

The synthesis, structure, and reactivity of phospha(m)adamantanes and tricyclic analogues have been reviewed. The basicity of the amino groups in some aminophosphines have been estimated by i.r. measurements. An Arbuzov reaction between trimethyl phosphite and an iodo-cobalt complex has been studied by H and P n.m.r. ... 

Kashiwabara et al. communicated optical resolution of (2-aminoethyl)-n-butylphenylphosphine and the preparation of the bis(acetylacetonato)colmlt011) complex containing the resolved aminophosphine. The resolved phosphine was allowed to react with tris(acetylacetonato)cobalt(III) in methanol solution in the presence of activated charcoal at room temperature. From the resulting solution a pair of diastereoisomers as shown in Fig. 1.6 was isolated by column chromatography using a SP-Sephadex C-25 ion exchanger and an aqueous solution of Na2[Sb2(rf-tart)2j. 

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