Reactions in microemulsion media. Borohydride reduction of mono- and dicarbonyl compounds
作者:David A. Jaeger、Mary Darlene Ward、Craig A. Martin
DOI:10.1016/s0040-4020(01)96887-5
日期:1984.1
A and 2-PrOH B) prepared by the substitution of 2-propanol for the S and O components of μE's A and B. Generally, the reductions were slightly faster in the microemulsion media than in the corresponding aqueous 2-propanol media. The significantly slower reduction of 4a relative to that of 3a in μE B indicated that the interphase is the reactive site. With enone 6a, the influence of microemulsions on
在26°下由己烷(O)的混合物,0.1 M KOH-NaBH 4的50:1(w / w)溶液(W)和1.23:1(w / w)的混合物(S)制备微乳液十六烷基三甲基溴化铵(HTABr)和1-丁醇。伪三元相图包含显着的微乳液(μE)区域,μE的A和B(分别为60:35:5和20:10:70 S:W:O)用于还原几种单羰基化合物[二苯甲酮(1a),苯甲醛(2a),苯乙酮(3a)和1-苯基-1-十八烷酮(4a)],α,β-不饱和酮[反式-4-苯基-3-丁烯2-(6a))]和二酮[4-(4'-苯甲酰基苯基)-2-丁酮(7a)]在26°下。为了进行比较,还对2-丙醇水溶液(2-PrOH A和2-PrOH B)进行了还原,方法是用2-丙醇代替μE的A和B的S和O组分。在微乳液介质中比在相应的2-丙醇水溶液中更快。相对于μEB中3a的降低,4a的降低明显更慢,这表明相间是反应位点。与烯酮6a,确定了微乳液对1