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Analysis of ABX spin systems in some 1,4-dihydro-1λ5, 4λ5-diphosphinines: Signs of 31P13C coupling constants and isotope effects

✍ Scribed by Gernot Heckmann; Ekkehard Fluck

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
381 KB
Volume
33
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ABX spin systems of the [mono‐^13^C]isotopomers with vinylic and phenyl ipso‐^13^C atoms of a number of symmetrical 1,4‐dihydro‐1,4‐diphenyl‐1λ^5^,4λ^5^‐diphosphinines were analysed. The substituent dependence of the absolute signs and magnitudes of ^2^J(PC) between the two ^31^P nuclei and two vinylic ^13^C atoms and of the ^4^J(PC) and ^3^J(PP) are reported. ^13^C isotope effects on δ(^31^P) and ^3^J(PP) are discussed.

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