The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Transesterification reactions. Thiophenols with ethyl β-ethoxyacrylates》. Authors are Croxall, W. J.; Freimiller, L. R.; Shropshire, E. Y..The article about the compound:Ethyl 3-Ethoxy-2-Propenoatecas:1001-26-9,SMILESS:O=C(OCC)/C=C/OCC).Reference of Ethyl 3-Ethoxy-2-Propenoate. Through the article, more information about this compound (cas:1001-26-9) is conveyed.
cf. C.A. 44, 9917f. PhSH (110 g.) and 144 g. EtOCH:CHCO2Et, distilled from 1 g. NaHSO4, give 91% EtOH and 87% Et β-(phenylmercapto)acrylate (I), b2.3 145-50°, n20D 1.5808; p-tolyl analog, b0.5 137-8°, n20D 1.5752, 86%; p-chlorophenyl analog, b1 147°, n20D 1.5920, 82%; 3,4-dichlorophenyl analog, b1 152-4°, n20D 1.6018, 80%. I (50 g.) and 15.8 g. KOH in 100 ml. H2O, refluxed 2 hrs., give 90% β-(phenylmercapto)acrylic acid which, recrystallized from petr. ether-Me2CO, gives 63 g. product m. 127-8.5° and 6 g. m. 83-6°; these are cis-trans isomers. β-(p-Tolylmercapto)acrylic acid, m. 136-8° and 104-7°, 92%; p-chlorophenyl analog, m. 98-112°, 90%; 3,4-dichlorophenyl analog, m. 98-128°, 87%.
As far as I know, this compound(1001-26-9)Reference of Ethyl 3-Ethoxy-2-Propenoate can be applied in many ways, which is helpful for the development of experiments. Therefore many people are doing relevant researches.
Reference:
Bromide – Wikipedia,
bromide – Wiktionary