<i>p</i>-Toluenesulfonic Acid Adsorbed on Silica Gel: An Efficient Dehydrating Agent of Alcohols
作者:Franco D'Onofrio、Arrigo Scettri
DOI:10.1055/s-1985-31463
日期:——
Secondary and tertiary alcohols are efficiently dehydrated by reaction with p-toluenesulfonic acid supported on silica gel. In particular, the procedure allows the direct conversion of 3-hydroxy-steroids into Î2-olefins or Î3,5-dienes, without passing through the mesylate or tosylate esters.
Palladium-catalyzed cross-coupling reactions of vinyl and aryl triflates with tetraarylborates
作者:Pier Giuseppe Ciattini、Enrico Morera、Giorgio Ortar
DOI:10.1016/s0040-4039(00)61293-5
日期:1992.8
Sodiumm tetraarylborates 2 have been found to couple efficiently with vinyl and aryltriflates 1 in the presence of a palladium(0) catalyst to afford arylalkenes and biaryls 3 in good yields and under mild conditions.