Carbon-13 NMR Studies of 1-Phenyl-4-Phosphorinanone and Derivatives. Single Crystal X-Ray Diffraction Analysis of 1-Phenyl-4-Phosphorinanone 1-Oxide and 1-Sulfide

The 13C nmr spectral analysis has been recorded for the title compounds in DCC13, and all data appear to be in a accord with chair forms. Single crystal x-ray diffraction analysis of 1-phenyl-4-phosphorinanone 1-oxide and the corresponding sulfide revealed flattened chair forms in the solid state. Neither the solution data nor the x-ray data provided any evidence for a twist form for either compound as has been suggested for the carbon counterpart, namely, cyclohexane-1,4-dione.