1. Mechanism of the Stereomutation of an Azaplatinacyclobutane Complex
- Author
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Bender, Christopher F. and Widenhoefer, Ross A.
- Abstract
The diastereomerically pure azaplatinacyclobutane complex , bearing a single deuterium atom at Cα, undergoes stereomutation about the Cα–Cβ bond of the azaplatinacyclobutane moiety at 30 °C with a half-life of 3.0 h. Kinetic analysis of the stereomutation of cis-6-α-d1established the activation parameters ΔH‡= 26 ± 2 kcal mol–1and ΔS‡= 6 ± 6 eu and a deuterium kinetic isotope effect resulting from deuteration of the Cβ atom of kH/kD= 1.32. These and related experiments support a mechanism for stereomutation involving rapid and reversible amine dissociation, reversible β-hydride elimination, and rate-limiting rotation about the Cα–Cβ bond of the resulting platinum enamine complex.
- Published
- 2021
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