Synthesis of E-3-alkoxy-4-hydroxy(alkoxy, acyloxy)phenylmethylene(2-hydroxyphenyl)amines was written by Dikusar, E. A.;Potkin, V. I.;Kozlov, N. G.. And the article was included in Russian Journal of General Chemistry in 2008.Electric Literature of C12H14O4 This article mentions the following:
Condensation of vanillin or vanillal derivatives with 2-aminophenol gave E isomers of azomethines (Schiff bases) containing hydroxy, ether, and ester groups. Under optimized conditions, high yields of E isomers of the Schiff bases were obtained and the cyclocondensation products were excluded. Quantum chem. calculations of some of the formation heat of E and Z configurations were carried out. In the experiment, the researchers used many compounds, for example, 4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4Electric Literature of C12H14O4).
4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Electric Literature of C12H14O4
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics