Yu, MingChao’s team published research in IUCrData in 2020 | CAS: 4755-77-5

Ethyl oxalyl monochloride(cas: 4755-77-5) belongs to acyl chlorides. In the laboratory, acyl chlorides are generally prepared by treating carboxylic acids with thionyl chloride (SOCl2). The reaction is catalyzed by dimethylformamide and other additives.HPLC of Formula: 4755-77-5

�-(2-Ethoxy-2-oxoacetamido)benzoic acid�was published in IUCrData in 2020. These research results belong to Yu, MingChao; Wang, LinLin; Wang, LingYang; Wu, ZhiYong. HPLC of Formula: 4755-77-5 The article mentions the following:

The title compound, C11H11NO5, was synthesized by reacting Et chlorooxoacetate with 2-aminobenzoic acid and its structure was examined by x-ray crystallog. The compound has a nearly planar geometry except for the terminal Me group. The asym. unit contains one title compound adopting the expected transoid conformation. In the crystal, pairs of mols. are linked by O-H···O hydrogen bonds into inversion dimers. The results came from multiple reactions, including the reaction of Ethyl oxalyl monochloride(cas: 4755-77-5HPLC of Formula: 4755-77-5)

Ethyl oxalyl monochloride(cas: 4755-77-5) belongs to acyl chlorides. In the laboratory, acyl chlorides are generally prepared by treating carboxylic acids with thionyl chloride (SOCl2). The reaction is catalyzed by dimethylformamide and other additives.HPLC of Formula: 4755-77-5

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