Peltier, Daniel et al. published their research in Bulletin de la Societe Chimique de France in 1960 | CAS: 81245-24-1

Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1) 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. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Application of 81245-24-1

The carboxyl group. Infrared absorption and ionization was written by Peltier, Daniel;Pichevin, Annick. And the article was included in Bulletin de la Societe Chimique de France in 1960.Application of 81245-24-1 This article mentions the following:

PK, νOH(monomeric), and νC:O (monomeric and dimeric) values of 17 substituted benzoic, 34 o-toluic, 17 m-toluic, and 12 p-toluic acids, as well as the νC:O values of 55 Me and Et esters were tabulated. For all the acids except the 6-substituted o-toluic acids (6-NO2, I, Br, Cl, OH, NH2), νOH (cm.-1) = 3498 + 9pK. The νC:O (monomeric) of the o-OH and o-NH2 acids were on the average 55 cm.-1 lower and those of nonchelated, 6-substituted o-toluic acids were approx. 5 cm.-1 higher than calculated from the appropriate equations (CA 53, 17954e). For acids free of chelation and steric effects, νOH = 5,028 – 0.857 νC:O (monomeric) (cm.-1). For 3-, 4-, and 5-substituted o-toluic acids, νOH = 5053 – 0.874 νC:O. The carbonyl frequencies of the Et esters were approx. 5 cm.-1 lower than those of the corresponding Me esters. These results are explained by electronic effects of H or alkyl group on the carbonyl group. 6-HO(or H2N)-2-MeC6H3CO2Me exhibited 2 carbonyl frequencies related to chelated and nonchelated forms. Similar data were presented for 2,3- (I), 2,4-, and 2,6-(MeO)MeC6H3CO2H, and o-MeOC6H4CO2H. The dimeric carbonyl absorptions were weak, the νOH were lower, and the νC:O were higher, based on the relations with pK, than expected for nonchelated acids. I was exceptional, as it gave a strong dimeric carbonyl absorption. In the experiment, the researchers used many compounds, for example, Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1Application of 81245-24-1).

Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1) 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. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Application of 81245-24-1

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics