首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ab Initio Study of the Thermal Isomerization of Tricyclo[3.1.0.0~(2,6)]hexane to (Z, Z)-1,3-Cyclohexadiene through the (E, Z)-1,3-Cyclohexadiene Intermediate
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Ab Initio Study of the Thermal Isomerization of Tricyclo[3.1.0.0~(2,6)]hexane to (Z, Z)-1,3-Cyclohexadiene through the (E, Z)-1,3-Cyclohexadiene Intermediate

机译:从头开始研究三环[3.1.0.0〜(2,6)]己烷通过(E,Z)-1,3-环己二烯中间体热异构化为(Z,Z)-1,3-环己二烯

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摘要

The isomerization of tricyclo[3.1.0.0~(2,6)]hexane to 1,3-cyclohexadiene was studied using ab initio calculations at the multiconfiguration and single-configuration levels of theory. Single-point energy calculations were also performed using the MCQDPT2 and CCSD(T) methods. The isomerization process was found to proceed through an (E, Z)-1,3-cyclohexadiene intermediate following a concerted, asynchronous pathway characterized as a conrotatory ring opening of he bicyclobutane moiety. The second step involves rotation about the trans double bond resulting in the (Z, Z)-1,3-cyclohexadiene product. The rate determining step is the fist one, with an activation barrier of about 43 kcal mol~(-1). The activation barrier of the second step was found to be only 3 kcal mol~(-1). A second concerted pathway as found lading directly to (Z, Z)-1,3-cyclohexadiene but with an activation barrier of 54 kcal mol~(-1). A multiconfiguration based wave function is necessary to properly describe the potential energy surface of the reaction.
机译:在理论的多构型和单构型水平上,采用从头算的方法研究了三环[3.1.0.0〜(2,6)]己烷向1,3-环己二烯的异构化反应。还使用MCQDPT2和CCSD(T)方法执行了单点能量计算。发现异构化过程通过(E,Z)-1,3-环己二烯中间体进行,其遵循一致的异步途径,其特征在于双环丁烷部分的旋转开环。第二步涉及绕反式双键旋转,得到(Z,Z)-1,3-环己二烯产物。速率确定步骤是第一步骤,具有约43kcal mol·(-1)的活化势垒。发现第二步的活化势垒仅为3 kcal mol〜(-1)。发现第二条协同途径直接与(Z,Z)-1,3-环己二烯交叠,但具有54kcal mol·(-1)的活化势垒。要正确描述反应的势能面,必须使用基于多配置的波动函数。

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