Asymmetric cyclizations via a sequential Michael addition/Conia-ene reaction by combining multifunctional quaternary phosphonium salt and silver catalysis was written by Fang, Guosheng;Zheng, Changwu;Cao, Dongdong;Pan, Lu;Hong, Haoran;Wang, Hongyu;Zhao, Gang. And the article was included in Tetrahedron in 2019.HPLC of Formula: 1190-39-2 This article mentions the following:
A one-pot asym. Michael addition/Conia-ene reaction sequence, catalyzed by combination of a dipeptide-derived multifunctional quaternary phosphonium salt and Ag2CO3 was developed, which provided a series of synthetically important chiral methylenecyclopentane derivatives in moderate to excellent yields (up to 97%) and enantioselectivities (up to 93%). In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2HPLC of Formula: 1190-39-2).
malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.HPLC of Formula: 1190-39-2
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics