Synthesis of aromatic azomethines from 4′-aminopropiophenone, vanillin, vanillal, and their derivatives was written by Dikusar, E. A.;Potkin, V. I.;Kozlov, N. G.. And the article was included in Vestsi Natsyyanal’nai Akademii Navuk Belarusi, Seryya Khimichnykh Navuk in 2006.Reference of 20665-85-4 This article mentions the following:
New aromatic azomethines containing keto, ether and ester groups, e.g., (E)-I, were synthesized by reaction of vanillin, vanillal, and their esters with 4′-aminopropiophenone in anhydrous methanol. In the experiment, the researchers used many compounds, for example, 4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4Reference of 20665-85-4).
4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Reference of 20665-85-4
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics