FOR experimental support for the molecularorbital treatment of spin-spin couplings developed by Pople and Santryl and others,2 the measurement of couplings involving nuclei other than protons is especially important. W-Couplings to itself3 and to 15N, V7Se, 119Sn, 125Te, 2O7Pb,ll g9Si, and Il9Hg,5 and 31P-couplings to l1BS and 29Si7 have been reported. In addition, some values of 13G31P coupling constants have recently been presented. McFarlane has reported8 "heteronuclear tickling" experiments on Me2PPh and Me,P+HPh, giving for the methyl 13G31P couplings -14 and +56 (& 1) Hz respectively, and Manatt and Elleman have obtained a value of 13.97 H z for Me3P,10 by using Overhauser-eff ect enhancement on 31P spectra. Finer and HarrisU have estimated J('3C-P-31P) for tetramethyldiphosphine.
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