Conformational effects on PNCH, PNC, and PNSi spin coupling in tervalent phosphorus–nitrogen compounds
- 1 January 1978
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 7,p. 764-769
- https://doi.org/10.1039/dt9780000764
Abstract
The 1H and 13C n.m.r. spectra of a series of tervalent phosphorus-nitrogen compounds having a known conformation about the P–N bond have been obtained. These measurements confirm previous assumptions that the coupling constants J(PNCH) and J(PNC) are relatively large and positive for a methyl group having a cis relation with the lone pair of electrons on phosphorus. J(PNCH) is small, and J(PNC) small and negative when the methyl group is trans to the lone pair. The results are discussed by reference to compounds of unknown conformation. The coupling constant, J(PNSi), in a series of silylaminophosphines, Ph2P·NR·SiMe3(R = Me, Et, Pr1, or But), also appears to be related to the conformation adopted by the P–N bond.Keywords
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