Determination of ³<i>J</i>(³¹P³¹P) and ¹³C³¹P coupling constants in 1,6‐diphosphatriptycene from carbon‐13 n.m.r. lone pairs effects on ¹³C³¹P couplings

Abstract

Abstract The 31 P 31 P and 13 C 31 P coupling constants in 1,6‐diphosphatriptycene have been obtained from analysis of its proton decoupled 13 C n.m.r. spectra. More accurate data, however, resulted from simultaneous analysis of the proton decoupled 13 C spectra and 31 P( 13 C) satellite spectra. The 13 C 31 P couplings are strongly influenced by the proximity and orientation of the phosphorus lone pair electrons. The first 31 P 31 P coupling in an aromatic diphosphine is reported.