Li, Li-feng published the artcileSynthesis of 3-difluoromethyl-1-methyl-1H-pyrazol-4-carboxylic acid, HPLC of Formula: 924-99-2, the publication is Jingxi Huagong Zhongjianti (2013), 43(6), 17-19, 47, database is CAplus.
3-Difluoromethyl-1-methyl-1H-pyrazol-4-carboxylic acid was prepared in overall yield of 52% with purity of 98% (HPLC) starting from propargyl alc. through several reaction steps including oxidation, esterification, addition, methylation and hydrolysis.
Jingxi Huagong Zhongjianti 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 C7H13NO2, HPLC of Formula: 924-99-2.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics