Synthesis of cetyltrimethylammonium tribromide (CTMATB) and its application in the selective oxidation of sulfides to sulfoxides
摘要:
The bright yellow crystalline cetyltrimethylammonium tribromide (CTMATB) reagent has been synthesized from the reaction of CTMAB and KBr with H2MoO4.H2O, H2O2 and H2SO4 in the molar ratio 1:2:0.01:4:0.93. CTMATB selectively oxidizes a variety of dialkyl and alkyl aryl sulfides to the corresponding sulfoxides in high yields under mild conditions. (C) 2003 Elsevier Science Ltd. All rights reserved.
DIBENZORYLENETETRACARBOXIMIDES AS INFRARED ABSORBERS
申请人:Koenemann Martin
公开号:US20100048904A1
公开(公告)日:2010-02-25
Dibenzorylenetetracarboximides of the general formula I
in which the variables are each defined as follows:
R′ are identical or different radicals:
hydrogen; optionally substituted aryloxy, arylthio, hetaryloxy or hetarylthio;
R are identical or different radicals:
hydrogen; optionally substituted C
1
-C
30
-alkyl, C
3
-C
8
-cycloalkyl, aryl or hetaryl;
m, n are each independently 0 or 1.
LIQUID CRYSTALLINE RYLENE TETRACARBOXYLIC ACID DERIVATIVES AND USE THEREOF
申请人:Koenemann Martin
公开号:US20110042651A1
公开(公告)日:2011-02-24
The present invention relates to liquid-crystalline rylenetetracarboxylic acid derivatives, to processes for their preparation and to their use as n-type organic semiconductors for producing organic field-effect transistors and solar cells.
Metal and solvent free selective oxidation of sulfides to sulfone using bifunctional ionic liquid [pmim]IO4
作者:Sabir Ahammed、Debasish Kundu、Mohammad Nahid Siddiqui、Brindaban C. Ranu
DOI:10.1016/j.tetlet.2014.11.089
日期:2015.1
The oxidation of organo-sulfides to sulfones has been accomplished using an easily accessible bifunctional ionic liquid, [pmim]IO4 in the absence of any other oxidants, metal and organic solvent at ambient temperature. A variety of sulfides including dialkyl, aryl–alkyl, diaryl, and aryl–hetero aryl have been oxidized to the corresponding functionalized sulfones in high yields by this procedure.
century, by activation of alcohols with activators, deoxygenative substitution of alcohols has been limited to employing nucleophiles with a single nucleophilic site. Herein, we demonstrate a fluoroolefin-mediated deoxygenative substitution of nonactivated and activated alcohols with diverse acidic nucleophiles, with inversion of configuration, to allow chemo- and enantiospecific construction of C–S, C–N