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Org Lett ; 20(17): 5490-5492, 2018 09 07.
Article in English | MEDLINE | ID: mdl-30129766

ABSTRACT

The ability of organoboronic acids to direct intermolecular [2 + 2] photodimerizations in the solid state is identified. The reactivity of 1,2-bis(4-pyridyl)ethylene (bpe) within cocrystals of discrete hydrogen-bonded molecular assemblies generates rctt-tetrakis(4-pyridyl)cyclobutane (tpcb) stereoselectively and in up to quantitative yield. Dry grinding of the boronic acids and excess bpe reveal the acids to function as supramolecular catalysts.

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