13 C and 1H N.m.r. spectra of But2PPBut2 at temperatures well below ambient show that there are two distinct environments for the tertiary butyl groups on the n.m.r. time-scale, whereas 31P spectra show there is only one type of phosphorus; this is attributed to the existence of the gauche isomer in preference to the trans and the two values of |1JPC+2JPPC| differ markedly.
S. Aime, R. K. Harris, E. M. McVicker and M. Fild, J. Chem. Soc., Chem. Commun., 1974, 426 DOI: 10.1039/C39740000426
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