Cationic Platinum-Catalyzed Etherification by Intra- and Intermolecular Dehydration of Alcohols
作者:Takanori Shibata、Ryo Fujiwara、Yasunori Ueno
DOI:10.1055/s-2004-835664
日期:——
Catalytic etherification of diols proceeds to give various cyclic ethers by use of cationic platinum salt, which is in situ prepared from PtCl2 and AgSbF6. Etherification of benzylic alcohols is also possible by intermolecular dehydration. Both of intra- and intermolecular etherifications smoothly proceed even under an atmosphere of air.
Gold-catalyzed oxidative cleavage of aryl-substituted alkynyl ethers using molecular oxygen. Simultaneous degradation of C–H and single and triple carbon–carbon bonds under ambient conditions
作者:Arindam Das、Rupsha Chaudhuri、Rai-Shung Liu
DOI:10.1039/b908338c
日期:——
We report the gold-catalyzed oxidativecleavage of aryl-substituted alkynyl ethers using molecular oxygen under ambient conditions; the transformation involves a remarkable cleavage of C-H, C-C and C[triple bond, length as m-dash]C bonds simultaneously.
trityl perchlorate, ethynyl vinylketone derivatives regioselectively react with silyl enol ethers to afford the corresponding Michael adducts in high yields. 2-Propynyl ether derivatives also react with silyl enol ethers in the presence of a catalytic amount of trityl perchlorate, to give the corresponding adducts in high yields. In the case of the reaction with 2-propynyl ether derivatives, regioselectivities