Oxidation of alkyl phenyl selenides with m-chloroperbenzoic acid in methanol at room temperature affords the corresponding alkyl methyl ethers almost quantitatively, the reaction being accompanied by phenyl migration and ring-contraction respectively when applied to selenides having a phenyl group vicinal to the phenylselenium moiety and to some methoxyselenation products of cyclic olefins.
An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention discloses a process for producing an isocyanate by subjecting a carbamic acid ester to a thermal decomposition reaction, including the steps of: recovering a low boiling point component in a form of a gaseous phase component from a thermal decomposition reaction vessel in which the thermal decomposition reaction is carried out; recovering a liquid phase component containing a carbamic acid ester from a bottom of the thermal decomposition reaction vessel; and supplying all or a portion of the liquid phase component to an upper portion of the thermal decomposition reaction vessel.
The title tellurosilane 1 reacted with esters and ethers in the presence of catalytic zinc iodide under very mild conditions, giving the corresponding products with C-telluration and O-silylation via nucleophilic cleavages of the CO bonds.
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.