Spectral characterization of coumarins and cinnamic acids was written by Mendez, Jesus;Lojo, M. I.. And the article was included in Microchemical Journal in 1969.Formula: C11H12O4 This article mentions the following:
The wavelengths of maximum absorption (in the range 220-450 nm) are given for 6-hydroxy-, 4-methyl-6,7-dihydroxy -, 6-hydroxy-7-(β-D-glucopyranosyloxy)-, 6-methoxy-7-(β-D-glucopyranosyloxy]-, 6-methoxy-7-[(6-O-β-D-xylopyranosyl-β-D-glucopyranosyl)oxy]-, 7,8-dihydroxy-, 7-(β-D-glucopyranosyloxy)-8-hydroxy-coumarin, dihydroxy- and dimethoxycinnamic acids, 2-hydroxy-3-methoxycinnamic acid, Me 3,4,5-trimethoxycinnamate, and 3,4-dihydroxy-5-methoxycinnamic acid in MeOH and in MeOH solutions containing NaOAc, H3BO3, AlCl3, NaBH4, and NaOH. A structural correlation for the spectral data was obtained only for the 5 coumarins naturally occurring in plants. In the experiment, the researchers used many compounds, for example, 3-(2,4-Dimethoxyphenyl)acrylic acid (cas: 6972-61-8Formula: C11H12O4).
3-(2,4-Dimethoxyphenyl)acrylic acid (cas: 6972-61-8) belongs to ethers. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. They are relatively unreactive, and as a result they are useful as solvents for fats, oils, waxes, perfumes, resins, dyes, gums, and hydrocarbons. Vapours of certain ethers are used as insecticides, miticides, and fumigants for soil. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.Formula: C11H12O4
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem