Abstract
Two sets of diastereomers of pentacoordinate spirophosphoranes separately derived from l-valine (or d-valine) and l-leucine (or d-leucine) were synthesized, isolated, and structurally characterized both in the solid state (X-ray crystallography and solid-state CD spectroscopy) and in the solution ( 1H NMR). The Λ and Δ absolute configurations of a pair of enantiomers 3a and 4a with distorted trigonal bipyramids (TBPs) geometry are directly determined by X-ray diffraction analysis, respectively. The chiral-at-phosphorus features of the related diastereomers were correlated with their solid-state CD and 1H NMR spectra.
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