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Updated: Jun 12, 2026

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[2+2]通过氧化可见光光催化剂的循环添加

Michael A Ischay1, Zhan Lu, Tehshik P Yoon

  • 1Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA.

Journal of the American Chemical Society
|June 10, 2010
PubMed
概括

三二) (Ru(bpy) ((3) ((2+)) 有效地催化 [2+2] 循环添加对于富含电子和缺乏电子的烯. 这种多功能光催化剂可以使用可见光进行应力环合成.

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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