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Abstract:
The platinum complexes [PtX(CH3)(SISdiop)]
(X = C1, Br,I) react quantitatively with NzCHCOZR
(R = Et, R-menthyl) in polar solvents (CDsCN, DMSO)
to give [PtX(CH(CH~)C02R)(SlS-dioaps) a] 2:l (R =
Et) or 4:l (R = R-menthyl) mixture of diastereomers.
The major diastereomer when X = C1 and R = Et is readily
separated, and its crystal structure reveals that the
configuration about the a-carbon is R; this complex is
configurationally stable in solution for at least 12 days.
In less polar solvents (CDCl3, C&& reaction of NzCHC02-
Et with [PtX(CH3)(SIS-diop)] (X = Br, I) give the
products of carbene insertion into the Pt-X as well as
Pt-C bonds.
