ABX spin systems
sign of 2J(PC),4J(PC) coupling constants
Analytical Chemistry and Spectroscopy
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
The ABX spin systems of the [mono-13C]isotopomers with vinylic and phenyl ipso-13C atoms of a number of symmetrical 1,4-dihydro-1,4-diphenyl-1λ5,4λ5-diphosphinines were analysed. The substituent dependence of the absolute signs and magnitudes of 2J(PC) between the two 31P nuclei and two vinylic 13C atoms and of the 4J(PC) and 3J(PP) are reported. 13C isotope effects on δ(31P) and 3J(PP) are discussed.
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