Regio- and Stereoselective Synthesis of β-Halohydrins from 1,2-Epoxides with Ammonium Halides in the Presence of Metal Salts
摘要:
A simple efficient, stereoselective, and regioselective method for the synthesis of beta-chlorohydrins, beta-bromohydrins, and beta-iodohydrins by the direct opening of 1,2-epoxides with the corresponding ammonium halide in acetonitrile, in the presence of metal salts. is described. This new method appears to be of general use and competitive with the other methods previously reported.
Effects of ring size on the reactions of cyclic olefins
作者:J.G. Traynham、O.S. Pascual
DOI:10.1016/s0040-4020(01)93183-7
日期:1959.1
methylenecycloalkanes (ringsizes C4 through C7) gave mixtures of chlorohydrins with abnormal orientation predominating with the 4- and 6-membered ring compounds. Addition of HOBr to these olefins gave 1-bromocycloalkylmethanols as the only bromohydrin product. Cycloalkanecarboxaldehyde, in amounts dependent on ringsize, accompanied the formation of bromohydrin fromolefin oxide and HBr solution.
Ionic Liquid as Reagent. A Green Procedure for the Regioselective Conversion of Epoxides to <i>V</i><i>icinal</i>-Halohydrins Using [AcMIm]X under Catalyst- and Solvent-Free Conditions
作者:Brindaban C. Ranu、Subhash Banerjee
DOI:10.1021/jo0500885
日期:2005.5.1
A variety of structurally diverse epoxides undergo facile cleavages by ionic liquid, [AcMIm]X without any catalyst and solvent to produce the corresponding vicinal halohydrins in high yields. The cleavages are considerably fast and highly regioselective.
Villieras, J.; Kirschleger, B.; Tarhouni, R., Bulletin de la Societe Chimique de France, 1986, # 3, p. 470 - 478
作者:Villieras, J.、Kirschleger, B.、Tarhouni, R.、Rambaud, M.
DOI:——
日期:——
Gudkova,A.S. et al., Doklady Chemistry, 1973, vol. 210, p. 415 - 417