Abstract

Cation–π-controlled preorientation of (E)-styrylthiazoles was performed in both solution and solid phases. Irradiation of (E)-styrylthiazoles in the presence of HCl produced synHT dimers in good selectivities, while little selectivity was observed without HCl. X-ray structures for the HCl salts of (E)-styrylthiazoles showed a head-to-tail arrangement through cation–π interactions between the two neighboring molecules. Irradiation of these HCl salts produced synHT dimers in excellent yields.

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