首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photoannulation of 4,4-Dimethylcyclohex-2-en-1-one To 1,1-Diphenylethylene
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Photoannulation of 4,4-Dimethylcyclohex-2-en-1-one To 1,1-Diphenylethylene

机译:4,4-二甲基环己-2-烯-1-酮对1,1-二苯基乙烯的光环化

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The photoannulation of 4,4-dimethylcyclohex-2-en-1-one (DMC) to 1,1-diphenylethylene (DPE) results in the [2+2] formation of cyclobutanes exhibiting regio- and stereoselectivity. Additionally, regio- and stereoisomers of substituted octahydrophenanthrenes are produced. Formally, these are derived from alpha-ortho coupling of a 1,4-biradical, followed by rearomatization. From laser flash photolysis experiments, we conclude that the temporal absorbance profile observed following excitation of DMC in the presence of DPE is a composite of multiple triplet state transients that includes triplet state 1,1-diphenylethylene and likely includes a triplet state 1,4-biradical. This analysis of the transient data reveals energy transfer and product forming interactions between ~3DMC and ground-state DPE. The present work renders our earlier interpretation [J. Am. Chem. Soc. 1996, 118, 8741], that the transient observed in this system was a ~3DMC-DPE exciplex, unnecessary and unlikely.
机译:4,4-二甲基环己-2-烯-1-酮(DMC)对1,1-二苯基乙烯(DPE)的光环化作用导致环丁烷的[2 + 2]形成,具有区域选择性和立体选择性。另外,产生取代的八氢菲的区域和立体异构体。从形式上讲,这些衍生自1,4-双自由基的α-邻位偶合,然后进行重新肿瘤化。从激光闪光光解实验中,我们得出结论,在DPE存在下DMC激发后观察到的时间吸光度分布图是多个三重态瞬态的复合物,其中包括三重态1,1-二苯乙烯,并且可能包括三重态1,4-激进的。对瞬态数据的分析揭示了〜3DMC与基态DPE之间的能量转移和产物形成相互作用。本工作提供了我们较早的解释[J.上午。化学Soc。 [1996,118,8741],在该系统中观察到的瞬态是〜3DMC-DPE激基复合物,是不必要的和不太可能的。

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