Journal of the Chemical Society. Perkin transactions II p. 927 - 932 (1983)
Update date:2022-08-04
Topics:
Jost, Roland
Sommer, Jean
The barrier to rotation around the phenyl-carbenium carbon bond in a series of carbenium ions R1R2C+Ph (with R1 and/or R2=H, CH3, cyclopropyl, and C6H4X) has been measured by complete line-shape analysis of the n.m.r. spectra or by the spin saturation transfer method. ΔG(excit.) Values range from 36 to 78 kJ mol-1.The results are discussed in terms of steric and electronic contributions and the relationship of the 13C chemical shift of the carbenium centre with the ?C+ values of the para-substituent is analysed.
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