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An efficient regioselective synthesis of tetrasubstituted 3‐imidazolines under organo‐photocatalytic conditions has been developed through formal [3+2]‐cycloaddition between 2H‐azirines and N‐tosyl benzylidene imines. The products were isolated in high yields and as a separable mixture of diastereoisomers in most of the cases. The mild reaction conditions employing an organic dye as photocatalyst,...