Sehgal, C. K. published the artcileA novel ring opening of coumarins, Computed Properties of 16909-09-4, the publication is Synthetic Communications (1980), 10(1), 37-42, database is CAplus.
Treatment of coumarins I (R = H or Me; R1, R2 = H, OH or MeO; R3 = H or CH2CH:CMe2), furocoumarins II (R4 = R5 = H or Me; R6 = Me, OMe or OH) and dioxolocoumarin III with MeI, EtI or Me2C:CHCH2Br with NaH in anhydr. THF gave either a mixture of cis and trans o-alkoxycinnamic acids in which the cis isomer predominated or the cis isomer exclusively. When the coumarin or furocoumarin was substituted in the 4-position, conversion to the cis isomer was almost quant.
Synthetic Communications 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 C6H16OSi, Computed Properties of 16909-09-4.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia