Mn. Glukhovtsev et al., IS THE MOST STABLE GAS-PHASE ISOMER OF THE BENZENIUM CATION A FACE-PROTONATED PI-COMPLEX, Journal of the Chemical Society, Chemical Communications, (22), 1995, pp. 2347-2348
The recent suggestion, based on gas-phase experimental data, that the
most stable isomer of protonated benzene has a face-protonated pi-comp
lex structure is not supported by our detailed computations which indi
cate that the pi-complex is a second-order saddle point on the potenti
al energy surface, lying 199 kJ mol(-1) higher in energy than the well
-established C-2v sigma-protonated structure.