An Experimental Study of the 4h J ( 31 P– 31 P) Coupling Constant and the 12 C/ 13 C Isotope Effect on 31 P in an Iminophosphorane-Substituted Proton Sponge
Free accessOtherFirst published online January, 2002
An Experimental Study of the 4h J ( 31 P– 31 P) Coupling Constant and the 12 C/ 13 C Isotope Effect on 31 P in an Iminophosphorane-Substituted Proton Sponge
The 13C NMR spectra of the bromide of the protonated iminophosphorane -substituted sponge 7 were recorded at different fields. Together with the use of 13C satellites of the 31P NMR spectrum, these experiments allow determination of a reasonable set of chemical shifts and coupling constants. The most interesting are a 4hJPP = 1.6 Hz, determined directly from the 31P NMR spectrum, which probably involves the hydrogen bond, and a 2Δ31P(13C) isotope shift of 9 ppb.
