The C-13, P-31 and H-1 NMR spectra of a series of dioxaphosphinopyridines a
nd pyridoazaphosphinines were studied. The interpretation of the chemical s
hifts of these compounds was based on model compounds and on selective irra
diation and two-dimensional shift correlated NMR techniques. Copyright (C)
1999 John Wiley & Sons, Ltd.