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Enol Formation and Ring-Opening in OH-Initiated Oxidation of Cycloalkenes

机译:OH引发的环烯烃氧化中的烯醇形成和开环

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Photolytic OH-initiated oxidation of cyclopentene,cyclohexene,and 1,4-cyclohexadiene have been investigated by using tunable synchrotron photoionization mass spectrometry.Electronic structure calculations(CBS-QB3)are employed in Franck-Condon(FC)spectral simulations of the photoionization efficiency curves(PIE)of the observed products.Cyclopentenol(cyclopenten-1-ol,1-c-C5H7OH)and its isomers cyclopenten-2-ol(2-C-C5H7OH)and cyclopentanone(c-C5H8=O),are detected from OH-initiated cyclopentene oxidation.The measured adiabatic ionization energy(AIE)of 1-c-C5H7OH is 8.4(±0.1)eV,and that of 2-c-C5H7OH is 9.5(±0.1)eV.The calculated AIE of possible cyclopentene oxidation products cis-1,2-epoxycyclopentane and 2,3-epoxycyclopentanol is 9.97 and 9.44 eV,respectively.Product spectra from OH-initiated oxidation of cyclohexene and cyclohexa-1,4-diene show a substantial contribution from linear aldehydes,indicating a prominent role for ring opening.Implications for the oxidation chemistry of cycloalkenes are briefly discussed.
机译:利用可调同步光子电离质谱研究了光解OH引发的环戊烯,环己烯和1,4-环己二烯的氧化反应。电子结构计算(CBS-QB3)用于Franck-Condon(FC)光谱模拟中的光电离效率检测到了环戊烯醇(环戊烯-1-醇,1-c-C5H7OH)及其异构体环戊烯-2-醇(2-C-C5H7OH)和环戊酮(c-C5H8 = O)的曲线(PIE)。由OH引发的环戊烯氧化得到。测得的1-c-C5H7OH绝热电离能(AIE)为8.4(±0.1)eV,而2-c-C5H7OH的绝热电离能为9.5(±0.1)eV。环戊烯氧化产物顺式1,2-环氧环戊烷和2,3-环氧环戊醇分别为9.97和9.44 eV.OH引发的环己烯和环己-1,4-二烯的氧化产物光谱表明,线性醛的贡献很大。开环的重要作用。对环氧化物的化学反应简要讨论了kenes。

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