Addition of chlorine, bromine and bromine chloride to some α,β-unsaturated methyl esters
作者:Ilpo O.O. Korhonen、Maija Pitkänen、Jorma N.J. Korvola
DOI:10.1016/0040-4020(82)85011-4
日期:1982.1
The additions of chlorine, bromine and bromine chloride to trans methyl 2-butenoate 1, trans methyl 2-methyl-2-butenoate 2 and methyl 3-methyl-2-butenoate 3 under ionic conditions were studied. Bromine chloride addition always gave as a major regioisomer the 2-bromo-3--chloro compound,almost quantitatively in the case of 3. The mechanism of bromonium ion ring-opening (SN1 or SN2) is discussed with
氯,溴和氯化溴到加法反式甲基-2-丁烯酸乙酯1,反式甲基-2-甲基-2-丁烯酸甲酯2和3-甲基-2-丁烯酸乙酯3离子的条件下进行了研究。氯化溴加成总是得到为主要区域异构体的2-溴-3 -氯化合物,在几乎定量的情况下,3。关于双键取代和区域异构体的比例,讨论了溴离子开环(S N 1或S N 2)的机理。通过MS,1 H和13 C NMR鉴定出二卤代产物。