Irradiation of trans-cinnamic acid (1) and its methyl ester (2) in 1% aq. cetyltirmethylammonium bromide gave dimeric products in 35 and 29% yields as a mixture of truxinic and truuxillic acids in a ratio of 19 : 1 and 3.8 : 1, respectively, while in homogeneous solutions (1) gave no photodimers and (2) gave dimeric products in 2.3% yield under similar reaction conditions.
Y. Nakamura, J. Chem. Soc., Chem. Commun., 1988, 477 DOI: 10.1039/C39880000477
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