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An elusive thermal [2 + 2] cycloaddition driven by visible light photocatalysis: tapping into strain to access C2-symmetric tricyclic rings

A mild and operationally simple methodology is reported for the synthesis of cyclobutane rings imbedded within a C2-symmetric tricyclic framework. The method uses visible light and an iridium-based photocatalyst to drive the oft-stated “forbidden” thermal [2 + 2] cycloaddition of cycloheptenes and analogs. Importan

Authors:   Kamaljeet Singh; Winston Trinh; Jimmie D. Weaver
Journal:   Organic & Biomolecular Chemistry
DOI:   10.1039/C8OB01273C
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