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Here we show that colloidal quantum dots serve as visible-light
chromophores, photocatalysts, and resuable scaffolds for homo- and
hetero-intermolecular [2+2] photocycloadditions of 4-vinylbenzoic acid
derivatives, with >90% tunable regioselectivity and up to 98%
diastereoselectivity for the previously minor syn-cyclobutane products,
including the syn-heda-to-tail cyclobutane, which has never been
produced as the major product of a photochemical reaction.