Bohme, Horst published the artcileOptical studies on coumarins. II. Ultraviolet absorption of monohydroxycoumarins and derivatives, Application of (E)-3-(2,4-Dimethoxyphenyl)acrylic acid, the publication is Archiv der Pharmazie und Berichte der Deutschen Pharmazeutischen Gesellschaft (1957), 405-12, database is CAplus.
cf. C.A. 51, 15270h. In comparative studies of 4 monohydroxycoumarins, the longwave absorption bands were found to be moved bathochromically by introduction of a hydroxy group in the 6 or 7 position, while the corresponding maximum of 5-and 8-hydroxycoumarins lies at shorter wave lengths. As with coumarin itself 3 bands appear with 5-, 6-, and 8-hydroxycoumarin. 7-Hydroxycoumarin does not produce the medial bands with an inflection at 240 m¦Ì. Dihydroxy-trans-cinnamic acids are optically very similar to their methylated derivatives, but big differences were noted between hydroxycoumarins and dimethoxy-cis-cinnamic acids.
Archiv der Pharmazie und Berichte der Deutschen Pharmazeutischen Gesellschaft published new progress about 16909-09-4. 16909-09-4 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Benzene,Ether, name is (E)-3-(2,4-Dimethoxyphenyl)acrylic acid, and the molecular formula is C11H12O4, Application of (E)-3-(2,4-Dimethoxyphenyl)acrylic acid.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia