Abstract
A palladium 1,2-ethylene-bisphosphine complex prepared by diphosphination of acrylonitrile and subsequent complexation undergoes facile and reversible C deprotonation at a backbone carbon atom. The 1,2-diphosphinoethanide complex that formed was characterized by spectroscopic data and a single-crystal X-ray diffraction study. The reaction may explain the previously observed configurational lability of coordinated 1,2-bisphosphine ligands with electron-withdrawing substituents.
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