Abstract New hybrid silica materials M1–M4, derivedfrom mono and bis-silylated aryl iodides, have been prepared via sol–gel processes, either by the hydrolytic polycondensation of a bis-silylated monomer or by the co-gelification of a monosilylated precursor with tetraethylorthosilicate. They have been fully characterized by elemental analysis, 13C and 29Si CP-MAS solid state NMR, IR, TGA, and nitrogen-sorption
Novel α-tosyloxylation of ketones catalyzed by the in situ generated hypoiodous acid from alkyl iodide
作者:Bijun Zhang、Liuquan Han、Jiantao Hu、Jie Yan
DOI:10.1016/j.tetlet.2014.08.093
日期:2014.10
Using a catalytic amount of 1-iodopropane, a novel and efficient procedure has been developed for direct preparation of alpha-tosyloxyketones from ketones. In this protocol, 1-iodopropane is first oxidized into iodosylpropane, which decomposes to form the key catalyst hypoiodous acid. With this method, not only alpha-tosyloxyketones, but also other alpha-sulfonyloxyketones have been prepared in moderate to good yields, which extends the application of alkyl substituted hypervalent iodine reagents in organic synthesis. (C) 2014 Elsevier Ltd. All rights reserved.
HATZIGRIGORIOU, EVANGELIA;VARVOGLIS, ANASTASIOS;BAKOLA-CHRISTIANOPOULOU, +, J. ORG. CHEM., 55,(1990) N, C. 315-318