Friedel–Crafts alkylation of arenes with epoxides promoted by fluorinated alcohols or water
作者:Guo-Xing Li、Jin Qu
DOI:10.1039/b926684d
日期:——
The stereoselective intra- and intermolecular Friedel-Crafts alkylation of electron-rich arenes with epoxides can take place in refluxing 1,1,1,3,3,3-hexafluoroisopropanol owing to its weak acidity and high ionizing power.
Tellurium in the “no-solvent” organic synthesis of allylic alcohols
作者:Qinyu Xu、Bin Chao、Yongmei Wang、Donald C. Dittmer
DOI:10.1016/s0040-4020(97)00547-4
日期:1997.8
Elemental tellurium can be reduced by rongalite (HOCH2SO2Na . 2H(2)O)-KOH in the solid phase by application of ultrasound or by microwave irradiation. Without solvent, the organic substrate (eg sulfonate ester of an oxiranemethanol) is added with further sonication or irradiation to yield the desired organic product (eg allylic alcohols) and elemental Te which may be recycled. Phase-transfer conditions (water-toluene) also ate satisfactory. (C) 1997 Elsevier Science Ltd.