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It is an electronically mismatched Diels-Alder cycloaddition1 to synthesize(1R,2R)-4-(tert-butoxy)-4-(tert-butyl)-2-methyl-1,2,3,6-tetrahydro-1,1-biphenyl catal-yzed by low loadings of the ruthenium photosensitizer([Ru(bpz)3 2+])and visible light irradiation.