Aminophosphines, optically active ligands

NH2CH(R)CH2PR R". The aminophosphine is an intermediate ligand between a diamine and a diphosphine. The optical activity of such aminophosphine complexes can be compared with that of diamine complexes studied extensively. 

Scheme 4 shows some optically active resolving agents used in the resolution of organometallic transition metal compounds of tetrahedral, octahedral, and square pyramidal geometry. Schemes 2 and 3 demonstrate the application of the menthoxide ion. The aminophosphine shown will be used in an example discussed later on. The pyridine imine chelate ligand has been the chiral auxiliary for the resolution of octahedral compounds [9,10], not described in detail here, and for the resolution of square pyramidal compounds to be discussed next [11]. 

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