Zhuo, Jin-Cong's team published research in Molecules [Electronic Publication] in 4

Zhuo, Jin-Cong published the artcile¹⁷O NMR spectra of α,β-unsaturated carbonyl compounds RCH=CHCOX: the influence of group X on the δ(¹⁷O) value of the carbonyl oxygen and on the shielding effect of group R, Formula: C7H13NO2, the publication is Molecules [Electronic Publication] (1999), 4(11), 320-328, database is CAplus.

¹⁷O NMR spectra of 26 X (R = Me, Ph), 40 RCH:CHCOX (I; R = H, Ph, Me, EtO₂C) and 4 Me₂C:CHCOX (X = H, Me, Et, CHMe₂, CMe₃, Ph, CH:CHPh, OMe, OEt, Cl, cyano, CF₃, CO₂Et) are reported. The ¹⁷O shift values of these carbonyl compounds depend mainly on the electron-donating power of X and correlate well with the resonance consts, σ_R⁺ of X. This suggests that the δ(¹⁷O) values can be used to reflect qual. the electrophilicity of the carbonyl group. The shielding effect of the substituent R in I is diminished with increasing electron-donating power of X and correlates with σ⁺ values of X.

Molecules [Electronic Publication] published new progress about 924-99-2. 924-99-2 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Amine,Aliphatic hydrocarbon chain,Ester, name is Ethyl 3-(dimethylamino)acrylate, and the molecular formula is C12H17NO2, Formula: C7H13NO2.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics