The α-methyl 2JPCC in 2,2,3,4,4-pentamethylphosphetans is stereospecific with respect to the exocyclic phosphorus substituent; the coupling is large (27–37 Hz) when trans and small (0–5 Hz) when cis to the exocyclic phosphorus substituent.
G. A. Gray and S. E. Cremer, J. Chem. Soc., Chem. Commun., 1972, 367 DOI: 10.1039/C39720000367
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