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The article focuses on photoinitiated [2+2] acyclic enone cycloaddition. It analyzes whether crossed intermolecular [2+2] heterodimerizations would be possible using two different enone substrates. The authors report that under the photocatalytic conditions they have developed, intermolecular dimerizations of enones could be performed.

The article discusses the study which develops new strategies for efficient visible light photocatalysis of synthetic transformations. It examines the [2+2] cycloaddition of bis(enone) 1 for the investigations into visible light photocatalysis. Key information on the methodologies and results is further presented.