17O and 31P NMR of aroylphosphanes, aroylsilanes and aroylphosphonates: Absence of resonance in —COPR2 groups (NMR of terminal oxygen, part 5 )

The 17O NMR spectra for aryl‐substituted P,P‐diphenylbenzoylphosphanes (p‐YC6H4COPPh2, 1), trimethylbenzoylsilanes (p‐YC6H4COSiMe3, 2) and dialkyl benzoylphosphonates (p‐YC6H4COPO(OR)2, 3) were recorded. Compounds 1, 2 and 3 show a similar high substituent sensitivity (p+), indicating a strong electron demand of the carbonyl group; as resonance stabilization is not possible in 2 and 3 it is concluded that electron donation from P to carbonyl is equally negligible in 1. The carbonyl oxygen signals of 1, 3 and, in particular, 2 appear at low field. The 31P NMR shifts of 1 were also measured; they are less sensitive to the ring substituents.

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