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用AM1方法（采用非限制的Hartree－FockUHF计算）研究取代乙烯CH2＝CHR（R＝CH3，CHO和CN）与环己-1,3-二烯的热Diels－Alder加成反应.结果表明，反应存在协同途径和两条自由基途径．
The thermal Diels-Alder addition reaction of substituted ethylene CH2 = CHR (R = CH3, CHO and CN) with cyclohexane-1,3-diene was studied by the AM1 method using a non-limiting Hartree-FockUHF calculation. There is a synergistic response to the reaction and two free radical routes.