Synthesis of photodegradable polyesters from bio-based 3,4-dimethoxycinnamic acid and investigation of their degradation behaviors

Template-Directed Selective Photodimerization Reactions of 5-Arylpenta-2,4-dienoic Acids

“… 12 In this design, irradiation of template-bound cinnamic acids 10 followed by hydrolysis gave symmetrical and unsymmetrical β-truxinic acids 11 in high yields and as single diastereomers ( Scheme 2 d). Despite the rich background 1b and recent advances 12 , 13 in the photodimerization of cinnamic acid derivatives, the analogous reactions of vinylogous cinnamic acids, namely 5-arylpenta-2,4-dienoic acids, are scarce. Indeed, besides the work of Hopf mentioned above, 7 and an early report from 1913, 14 to our knowledge, there are only a few studies which involve photodimerization of 5-arylpenta-2,4-dienoic acids.…”