Highly Efficient, Regio- and Stereoselective Ring Opening of Epoxides and Thiiranes with Ce(OTf)<sub>4</sub>
作者:N. Iranpoor、M. Shekarriz、F. Shiriny
DOI:10.1080/00397919808005728
日期:1998.1
Abstract Cerictriflate, Ce(OTf)4 is used as an efficient catalyst for ring opening of epoxides in the presence of alcohols, water, and acetic acid. The reactions proceed with high regio and stereoselectivity and in excellent yields. The reaction of R(+) styrene oxide with methanol occurs with excellent optical purity. Ring opening of thiiranes in alcohols, water and acetic acid followed by dimerisation
Reactions of epoxides and episulfides with electrophilic halogens
作者:Nasser Iranpoor、Habib Firouzabadi、Maryam Chitsazi、Abbas Ali Jafari
DOI:10.1016/s0040-4020(02)00699-3
日期:2002.8
conversion of epoxides into β-bromoformates using Ph3PBr2, Ph3P/N-bromosuccinimdes (NBS) and or Ph3P/2,4,4,6-tetrabromo-2,5-cyclohexadiene-1-one (TABCO) in DMF. Epoxides in the presence of Ph3P/I2 were converted into olefins immediately in excellent yields. The application of NBS, NCS, and TABCO as compounds carrying electrophilic halogens for the highly selective alcoholysis of epoxides and dimerization
描述了一种使用Ph 3 PBr 2,Ph 3 P / N-溴代琥珀酰亚胺(NBS)和Ph 3 P / 2,4,4,4,6-四溴-2,5-将环氧化物转化为β-溴甲酸酯的新方法。 DMF中的环己二烯-1-酮(TABCO)。在存在Ph 3 P / I 2的情况下,环氧化物立即以优异的收率转化为烯烃。还描述了NBS,NCS和TABCO作为携带亲电卤素的化合物在环氧化物的高选择性醇解和环硫化物的二聚化或醇解二聚化中的应用。
AMINOPROPYL SILICA GEL SUPPORTED IODINE AS CATALYST IN NUCLEOPHILIC RING OPENING OF EPOXIDES AND EPISULFIDES
作者:B. Tamami、N. Iranpoor、H. Mahdavi
DOI:10.1081/scc-120003617
日期:2002.1
ABSTRACT Silicagel functionalized by aminopropyl group was prepared. Iodine was then supported on this inorganic polymer and used as a stable and efficient heterogeneous catalyst for nucleophilic ring opening reactions of epoxides and episulfides in different nucleophilic solvents such as alcohols, water and acetic acid.