Optically Active Transition Metal Complexes, XXXIV (+)579‐ and (‐)579‐(‐C5H5)Mo(CO) (NO)[P(C6H5)2N(CH3)CH(CH3)(C6H5)]

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Abstract
In the reaction of C5H5Mo(CO)2NO +) with (+)579 n‐(C6H5)2PN(CH3)CH(CH3) (C6H5), abbreviated with PØ2R*, the pair of diastereoisomers (+)579‐ and (‐)579‐ C5H5Mo (CO) (NO)PØ2R* (+)I and (‐)I is formed. The two diastereoisomers can be separated by preparative liquid chromatography; the less soluble isomer can also be obtained optically pure by several fractional crystallisations. The asymmetric induction of the group R* on the substitution of the enantiotopic CO ligands is only small; the two diastereoisomeric complexes (+)I and (‐)I are obtained in nearly equimolar amounts. The compounds are configurationally stable in solution even in the presence of nucleophiles like triphenylphosphine and isonitriles.The amino phosphine ligand in C5H5Mo(CO) (NO)PØ2R* can be transformed into the methoxy phosphine ligand P(C6H5)2OCH3 by reaction with HCl followed by addition of CH3OH.