在氟双相体系中,发现found (IV)双(全氟辛烷磺酰基)酰胺配合物(Hf [N(SO 2 C 8 F 17)2 ] 4)是一种高反应性和可循环利用的路易斯酸催化剂,用于Friedel-Crafts酰化和普林斯在极低的催化剂负载量(≤1mol%)下进行反应。在这些反应中,Hf [N(SO 2 C 8 F 17)2 ] 4选择性地溶解在低氟相中,并且可以简单地通过相分离来回收。此外,催化剂可以重复使用而不会降低活性。
The enantiomerically enriched diastereoisomers of the chiral1,3-dioxaneodorants Floropal® (1) and Magnolan® (2) were prepared by an enzyme-mediated approach. Their olfactory properties were evaluated to investigate differences in the odor perception for the stereoisomers.
Prins Cyclization of Styrenes or Acetophenone Catalyzed by DBSA in Water
作者:Juan Zhang、Lin Hua、Feifei Li、Xuefen Wu、Shengzhi Tian、Jing Yang
DOI:10.1080/00397911.2010.538891
日期:2012.4.15
Dodecylbenzenesulfonic acid (DBSA) was proved to be an efficient catalyst for Prins cyclization of styrenes and formaldehyde or acetaldehyde in water. A tandem dehydration/Prins cyclization reaction using a tertiary alcohol and formaldehyde as substrates proceeded very well by using DBSA as catalyst. Acetophenone, which is less reactive compared with styrene, can also react with formaldehyde when catalyzed by DBSA in water to afford 1,3-dioxan-5-ylphenylmethanone in good yield.
Condensation d'alcenes aromatiques avec l'acetaldehyde catalysee par des resines echangeuses d'ions—II