Sulfonium salts are extremely powerful alkylating agents, particularly in the two-phase technique both solid-liquid and liquid-liquid). Alkylation of carboxylate salts by sulfonium salts does not show very large dependence on ratio of reactivities of various groups attached to the sulfur and mixtures of esters are often obtained. In the presence of copper(I) salts, there is a strong acceleration of
Tungstate-exchanged Mg-Al-LDH catalyst: an eco-compatible route for the oxidation of sulfides in aqueous mediumIICT Communication No: 020222
作者:B. M. Choudary、B. Bharathi、Ch. Venkat Reddy、M. Lakshmi Kantam
DOI:10.1039/b205292j
日期:2002.9.11
The catalytic oxidation of sulfides selectively to sulfoxides and/or sulfones is realised for the first time with heterogeneous tungstate-exchanged Mg-Al-LDH catalyst using 30% hydrogen peroxide in aqueous media at a faster rate in quantitative yields at room temperature. The heterogeneous catalyst showed higher activity (TOF) over its homogeneous analogues and other heterogeneous catalysts reported so far. The catalyst is well characterised by various instrumental techniques such as FT-IR spectroscopy, thermal analysis (TGA and DTA), powder XRD and chemical analysis. The catalyst is reused for six cycles with consistent activity and selectivity.
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.