Esters as Acylating Reagent in a Friedel−Crafts Reaction: Indium Tribromide Catalyzed Acylation of Arenes Using Dimethylchlorosilane
作者:Yoshihiro Nishimoto、Srinivasarao Arulananda Babu、Makoto Yasuda、Akio Baba
DOI:10.1021/jo801914x
日期:2008.12.5
The Friedel-Craftsacylation of arenes with esters by dimethylchlorosilane and 10 mol % of indium tribromide has been achieved. The key intermediate RCOOSi(Cl)Me(2) is generated from alkoxy esters with the evolution of the corresponding alkanes. The scope of the alkoxy ester moiety was wide: tert-butyl, benzyl, allyl, and isopropyl esters were successful. In addition, we demonstrated the direct synthesis
Arynes were found to insert into carbonâhalogen Ï-bonds of various acid halides, enabling acyl and halogen moieties to be introduced simultaneously into adjacent positions of aromatic rings.
A novel catalytic system, the complex of antimony(V) chloride (SbCl5) and benzyltriethylammonium chloride (TEBA), C6H5CH2NEt3(SbCl5)2Cl complex, is described for Friedel–Crafts acylation reactions of aromatics with acyl and sulfonyl chlorides. The catalyst has a number of useful characteristics, such as ready access, minimal toxicity, reusability, insensitivity to atmosphere and moisture, rapid acylation
一种新的催化体系,该复合物的锑(V),氯化锑酸盐(SbCl 5)和苄基三乙基氯化铵(TEBA),C 6 H ^ 5 CH 2净3酸盐(SbCl 5)2 C1复合物,芳烃的Friedel-Crafts酰化反应进行说明与酰基和磺酰氯。该催化剂具有许多有用的特性,例如易于获得,毒性最小,可重复使用,对大气和湿气不敏感,以高收率快速酰化以及易于操作。
Synthesis of 1-aminoanthraquinone
申请人:Hoechst Celanese Corporation
公开号:US05130448A1
公开(公告)日:1992-07-14
1-Aminoanthraquinone (1-AAQ) is synthesized by the condensation of 2-substituted benzoic acid and xylene to yield 2-substituted-dimethylbenzophenone, subsequent oxidation of the methyl groups, ring closure to form a 1-substituted anthraquinone carboxylic acid, replacement of the 1-substituent with ammonia, and decarboxylation.
Neue 1,2-Benzisothiazole und Verfahren zu ihrer Herstellung
申请人:BASF Aktiengesellschaft
公开号:EP0000750A1
公开(公告)日:1979-02-21
Neue 1,2-Benzisothiazole und ein Verfahren zur Herstellung von 1,2-Benzisothiazolen durch Umsetzung von o-Halogen- arylketonen mit Ammoniak und elementarem Schwefel.
Die nach dem Verfahren der Erfindung herstellbaren Verbindungen sind wertvolle Ausgangsstoffe für die Herstellung von Farbstoffen, Pflanzenschutzmitteln und Pharmazeutika.