Optically Active (2-Aminoethyl)methylphenylarsine and (2-Aminoethyl)butylphenylarsine and Their Palladium(II) and Platinum(II) Complexes

Article abstract of DOI:10.1246/bcsj.58.258

The chiral bidentate ligands, (2-aminoethyl)methylphenylarsine (mpan) and (2-aminoethyl)butylphenylarsine (bpan) were prepared and resolved by preparing their palladium (II) complexes containing, respectively, (R)-N,N-dimethyl-1-(2-naphtyl)ethylamine and (S)-N,N-dimethyl-α-methylbenzylamine.The optically active free ligands can be readily liberated from the palladium(II) complexes, and complexes of the type IIX₂L> (M^II=Pd,Pt; X=Cl, Br; L=R-mpan, S-bpan) were prepared.The absorption and circular dichroism (CD) spectra of these and related complexes were recorded, and the absolute configurations of the arsenic atoms were assignet by comparing the CD spectra with those of analogous phosphine complexes.The optically active arsines in diethyl ether solution racemize by the addition of hydrochloric acid at room temperature, but their palladium(II) complexes in acetonitrile-ethanol solution containig hydrochloric acid are very optically stable and do not racemize by refluxing for a long time.