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31P and 13C NMR spectra of cyclohexylphenylphosphines, tricyclohexylphosphine and triphenylphosphine

✍ Scribed by Jan Schraml; Martin Čapka; Vratislav Blechta

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
362 KB
Volume
30
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

^13^C and ^31^P NMR chemical shifts and coupling constants are reported and assigned for the two cyclohexylphenylphosphines, tricyclohexylphosphine and triphenylphosphine. The ^13^C NMR spectra of all compounds except dicyclohexylphenylphosphine could be assigned on the basis of APT experiments, substituent effects on the chemical shifts and the values of the ^13^C^31^P spin–spin coupling constants. The ^13^C NMR spectrum of dicyclohexylphenylphosphine, which shows six non‐equivalent (both in chemical shift and in spin–spin coupling) cyclohexyl carbons, was completely assigned on the basis of one‐bond and long‐range ^13^C^13^C 2D INADEQUATE experiments. The variable‐temperature spectra indicate a hindered motion in this compound. The one‐bond ^13^C^13^C spin–spin coupling constants of the cyclohexyl carbons vary only slightly with the distance from the substituent. An increase in the ^31^P chemical shift with an increasing number of cyclohexyl groups parallels the increasing catalytic activity of rhodium complexes containing the studied molecules as ligands.

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