Abstract
The intensity of 13NMR signals of carbon atoms bonded to boron can frequently be increased by recording the spectra at low temperatures. Though this procedure results in a loss of fine structure, it enables the determination of chemical shift data for NMR signals that are either broad or unobservable at ambient temperature. On the other hand, high temperature recording of spectra seems to be a useful technique for resolving multiples resonance signals that are collapsed in ambient temperature spectra. 13C NMR data are reported for a variety of phenylborane derivatives; no simple correlation seems to exist between σ 13C of the phenyl carbon atom bonded to boron and σ 11B of the phenylborane species.
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