期刊
TETRAHEDRON LETTERS
卷 43, 期 23, 页码 4215-4219出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(02)00747-5
关键词
alkenes epoxidation; peroxy acids; diradical transition state; ab initio; multiconfiguration approach
The transition state structure for the reaction of epoxidation of ethylene with peroxyformic acid is investigated at the CASSCF and UQCISD levels of theory. Both methods yield a highly unsymmetrical oxygen-addition transition state which has a diradical character. The value of the activation barrier calculated at the MCQDPT2(12,12)/6-311++G(d,p)//CASSCF(12,12)/6-311++G(d,p) correlated level (18.3 kcal/mol) is within the range of experimentally measured values. The predicted values of KIEs are in good agreement with the experimental data. (C) 2002 Elsevier Science Ltd. All rights reserved.
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