Abstract
By double salt formation, diamines can steer the solid-state [2+2] photodimerization of trans-cinnamic acid ( 1). Thus, the yields for the photodimerization were significant only in three double salts, i.e., the ones with tn and t- and c- chxn, which are assumed to have an overlap structure. The resultant photodimer is generally β-truxinic acid, although in one case, ε-truxillic acid was formed. α-Truxillic acid was not produced from any of the double salts studied. The X-ray crystal structures of three double salts of low photoreactivity ( 1·en, 1·pen, 1·hen) were consistent with Schmidt's rule.
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