EFFICIENT REDUCTION OF ORGANIC COMPOUNDS WITH SULFURATED CALCIUM BOROHYDRIDE [Ca(S<sub>3</sub>BH<sub>2</sub>)<sub>2</sub>], A NEW AND STABLE MODIFIED BOROHYDRIDE REAGENT
Calcium, magnesium, and berelium borohydrides are prepared by metathetical reaction between NaBH2S3 and Ca, Mg, and Be chlorides in dry THF and the effect of metal cation exchange on their stability and reactivity has been presented. In this study we have shown that Ca(BH2S3)2 is much more stable and more reactive than its Mg, Be, and Na analogues. Ca(BH2S3)2 can easily reduce carbonylcompounds such as
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。
Synthesis of Disulfides by Copper-Catalyzed Disproportionation of Thiols