2-[3-Alkoxy-4-(hydroxy, alkoxy, acyloxy)phenyl]-2,3-dihydro-1H-benzimidazoles on the basis of vanillin and vanillal derivatives was written by Dikusar, E. A.;Kozlov, N. G.;Potkin, V. I.. And the article was included in Russian Journal of General Chemistry in 2007.Product Details of 20665-85-4 This article mentions the following:
Previously unknown 2-[3-alkoxy-4-(hydroxy-, alkoxy-, and acyloxy)phenyl]-2,3-dihydro-1H-benzimidazoles were prepared by the reaction of aldehydes of the vanillin series and their ethers and esters with 1,2-phenylenediamine in absolute MeOH. In the experiment, the researchers used many compounds, for example, 4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4Product Details of 20665-85-4).
4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. 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. Product Details of 20665-85-4
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics