Kinetics of −CH2CH2– Hydrogen Release from a BN-cyclohexene Derivative

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• 作者：Zachary X. Giustra ; Lien-Yang Chou ; Chia-Kuang Tsung ; Shih-Yuan Liu
• 刊名：Organometallics
• 出版年：2016
• 出版时间：August 8, 2016
• 年：2016
• 卷：35
• 期：15
• 页码：2425-2428
• 全文大小：334K
• 年卷期：0
• ISSN：1520-6041

文摘

Complete −CH₂CH₂– dehydrogenation of 1,2-dimethyl-1,2-BN-cyclohexene (1) was achieved using a Pd/C catalyst in a gas-phase microreactor. Arrhenius analysis yielded an activation energy (E_a) of 10.3 ± 0.3 kcal mol^–1 and a pre-exponential factor (A) of 2.2 ± 0.2 (log A), respectively. These terms reflect a lesser kinetic favorability in comparison to those determined for all-carbon dimethylcyclohexene (E_a = 8.6 ± 0.3 kcal mol^–1, log A = 3.6 ± 0.1). Despite being isostructural and isoelectronic with a C═C bond, the B–N bond of 1 thus appears to confer a different measure of activity with respect to Pd-catalyzed −CH₂CH₂– dehydrogenation.