A. Kumar et Dc. Dittmer, A CATALYTIC TELLURIUM PROCESS FOR THE TRANSPOSITION OF ALLYLIC HYDROXYL-GROUPS AND CARBON-CARBON DOUBLE-BONDS, Tetrahedron letters, 35(31), 1994, pp. 5583-5586
As little as 0.1 molar equivalent of elemental tellurium in combinatio
n with excess (up to 3 molar equivalents) reducing agent (HOCH2SO2Na.2
H2O, NaBH4, or LiEt(3)BH) effects the telluride-ion mediated transposi
tion of allylic hydroxyl groups and carbon-carbon double bonds that pr
oceeds via the epoxy tosylate. The workup is much more convenient than
when a molar equivalent of tellurium is used.