The 1H, 13C and 31P NMR spectra of EZ pairs of some phosphorus substituted alkenes

Wiley - Tập 15 Số 1 - Trang 37-42 - 1981
Mark W. Duncan1, Michael J. Gallagher1
1School of Chemistry, University of New South Wales, PO Box 1, Kensington, NSW 2033, Australia

Tóm tắt

Abstract

The olefins Ph2P(X)CHCHR [X=lone pair, O, S, Ch3I; RCh3, ph, P(X)ph2] have been prepared and their 1H, 13C and 31P NMR spectra measured. trans 3J[P(IV)C] (range 18.3–25.7 Hz) is greater than cis 3J[P(IV)C] (range 6.9–11 Hz) but this relationship does not hold for P(III) compounds. In the 31P spectra the E isomer absorbs to higher field than the Z isomer for P(III) and P(IV) compounds. The 1H data are in accord with previous results; average substituent shielding coefficients for ph2P(X) substituted alkenes are reported.

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Wiley

Tập 15 Số 1

37-42

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