1977 Volume 50 Issue 12 Pages 3265-3267
The circular dichroism (CD) peaks of trans(N, ethylene)[PtCl(L-am)(C2H4)] (L-am, L-amino carboxylate) in acetonitrile (AN) at 33000 and 37000 cm−1 are characteristic of those complexes with asymmetric nitrogen. The CD sign depends on the substituents on the asymmetric nitrogen, and the additivity law holds for methyl and benzyl derivatives of L-prolinato, L-hydroxyprolinato, and L-valinato complexes. The quadrant rule is applicable to the contribution of the substituents on the nitrogen. On the preparation of the benzyl-L-valinato complex from Zeise’s salt in a weakly acid medium the nitrogen exhibits a marked stereoselectivity to give R configuration.
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