Citation:
ZHU Yuan-Qiang, GUO Jian-Chun, YE Zhong-Bin. AuClx (x=1, 3)-Catalyzed Benzannulation Mechanisms between 2-Propynyl-hypnone and Benzyne[J]. Acta Physico-Chimica Sinica,
;2011, 27(09): 2043-2050.
doi:
10.3866/PKU.WHXB20110921
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The AuClx (x=1, 3)-catalyzed benzannulation mechanisms between benzyne and 2-propynylhypnone were investigated using B3LYP, B3PW91, UB3LYP, and the second-order Møller-Plesset perturbation (MP2) methods with the LanL2DZ basis set for Au and the 6-31G*, 6-311++G** basis sets for C, H, O, Cl. For the AuCl or AuCl3 catalysts the reaction occurs through both the [4 + 2] and the [3 + 2] benzannulation pathways to yield the product. With AuCl, the reaction occurs mainly through the [4 + 2] reaction pathway because of this pathway's low activation free energy. With AuCl3, the reaction occurs by the [4+2] and the [3+2] reaction pathways. These two pathways are competitive because of their close activation free energies. An analysis of these results indicates that the ld oxidation states change the reaction mechanisms and greatly influence the reaction barriers. The calculated results indicate that the AuCl catalyst is more effective than AuCl3 because in the reaction catalyzed by AuCl the activation free energy of the rate determining step is 11.18 kJ·mol-1 lower than that of the reaction catalyzed by AuCl3. These results are in od agreement with the experimental observations.
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