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(A) Initial report of a visible light induced [2 + 2] cycloaddition reaction using a Ru(bpy)32+ 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.
