The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Cyclopentyl and cyclohexyl acrylates》. Authors are Ipatov, A. V..The article about the compound:2,3-Dibromopropionic acidcas:600-05-5,SMILESS:O=C(O)C(Br)CBr).Quality Control of 2,3-Dibromopropionic acid. Through the article, more information about this compound (cas:600-05-5) is conveyed.
Cyclopentanol and cyclohexanol were esterified by BrCH2CHBrCO2H in Et2O with cooling and saturation of the mixture with HCl (yields, etc., not stated); cyclopentyl α,β-dibromopropionate, b65 178-80°, b749 236-9°, d420 1.5305, nD20 1.5049; cyclohexyl α,β-dibromopropionate, b65 193-4°, b749 243-5°, d420 1.5602, nD20 1.5055. The esters were treated with Zn and dilute H2SO4 with heating on a steam bath and distilled after drying to yield the corresponding acrylic esters: cyclopentyl, b750 166-70°, d420 1.0230, nD20 1.4653; cyclohexyl, b750 182-4°, d420 1.0275, nD20 1.4673.
After consulting a lot of data, we found that this compound(600-05-5)Quality Control of 2,3-Dibromopropionic acid can be used in many types of reactions. And in most cases, this compound has more advantages.
Reference:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem