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. Author manuscript; available in PMC: 2017 Oct 18.
Published in final edited form as: Acc Chem Res. 2016 Aug 9;49(10):2307–2315. doi: 10.1021/acs.accounts.6b00280

Figure 2.

Figure 2

(A) Initial report of a visible light induced [2+2] cycloaddition reaction using a Ru(bpy)3 2+ photocatalyst. (B) Examples of substrate scope in the [2+2] cycloaddition. (C) Proposed mechanism for the photocatalytic [2+2] cycloaddition of 5. (D) Gram-scale photocycloaddition conducted using ambient sunlight as the irradiation source.