Tellurium in the “no-solvent” organic synthesis of allylic alcohols
摘要:
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.
A catlaytic tellurium process for the transposition of allylic hydroxyl groups and carbon-carbon double bonds
作者:Archana Kumar、Donald C. Dittmer
DOI:10.1016/s0040-4039(00)77252-2
日期:1994.8
As little as 0.1 molar equivalent of elemental tellurium in combination with excess (up to 3 molar equivalents) reducing agent (HOCH2SO2Na.2H2O, NaBH4, or LiEt(3)BH) effects the telluride-ion mediated transposition of allylic hydroxyl groups and carbon-carbon double bonds that proceeds via the epoxy tosylate. The workup is much more convenient than when a molar equivalent of tellurium is used.