Abstract
The synthesis of the title compound is described. C20H23BrNO2P crystallizes in the monoclinic space group P21/c with cell constants a= 12.934(1), b= 8.996(1), c= 17.622(3)A, β= 106.74(1)°, Z= 4. The structure was solved by the heavy-atom method and refined to an R value of 0.046. The phosphorinanium ring adopts a chair conformation which is substantially flattened at the phosphorus end. The study confirmed the endo- and exo-disposition of phenyl and p-nitrophenyl substituents, respectively. The ring conformation, bond lengths, and angles as well as torsional angles are compared to calculated values of the silicon analogue; there is close similarity.
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