cas 28736-42-7, 1,4-Difluoroanthraquinone | Articles data

Articles about 28736-42-7Total 9 be found

Synthesis method of hydroquinine(anthraquinone-1,4-diyl)diether
The invention discloses a synthetic method of hydroquinine(anthraquinone-1,4-diyl)diether (CAS: 176097-24-8) as shown in a formula (f), which comprises the following steps: by using phthalic anhydrideas a raw material, carrying out Friedel-Crafts reaction and dehydration cyclization reaction to obtain a compound c; and carrying out a coupling reaction on the compound c and dihydroquinine to obtain the hydroquinine(anthraquinone-1,4-diyl)diether. The synthesis method has the advantages of short reaction route, high yield, simplicity and convenience in operation, low cost, suitability for industrial production and the like.
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(2020/10/21)

Synthesis of 6,13-difluoropentacene
6,13-Difluoropentacene was synthesized from 1,4-difluorobenzene. Friedel-Crafts annulation of the latter with phthalic anhydride and subsequent reduction of the anthraquinone gave 1,4-difluoroanthracene. After ortho-lithiation and reaction with phthalic anhydride a carboxylic acid was obtained whose Friedel-Crafts acylation and subsequent reductive removal of the oxygen-functionalities resulted in the formation of the target compound. The HOMO-LUMO gap of 6,13-difluoropentacene was determined via UV-vis spectroscopy and compared to other fluorinated pentacenes.
Tripp, Matthias W.,Koert, Ulrich
p. 2136 - 2140
(2021/02/03)

Eine neue Ligandenklasse fuer die asymmetrische Dihydroxylierung von Olefinen
Keywords: Asymmetrische Dihydroxylierungen; Chirale Liganden; Chinchonaalkaloide; Katalyse; Osmiumverbindungen
Becker, Heinrich,Sharpless, K. Barry
p. 447 - 449
(2007/10/03)

Synthesis of fluorine-substituted anthraquinones and azaanthraquinones
Using 1,4-dipolar-aryne cycloaddition methodology, a convenient, short synthesis of several fluoroanthraquinones is presented which involves the reaction of haloarenes and 3-cyanophthalides in the presence of lithium diisopropylamide (LDA) in tetrahydrofuran (THF).The fluorine substituent(s) can be introduced by using fluorine-substituted haloarenes and/or 3-cyanophthalides.Similarly, fluorine-substituted pyridines can be prepared by treating fluorine-substituted cyanophthalides and halopyridines in the presence of lithium diisopropylamide.
Khanapure, Subash P.,Han, Wei,Swartling, Dan J.,Biehl, Edward R.
p. 131 - 134
(2007/10/02)

CATALYTIC METHOD FOR PRODUCING FLUOROAROMATIC COMPOUNDS USING N-SEC-ALKYL PYRIDINIUM SALTS
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(2008/06/13)

CATALYTIC METHOD FOR PRODUCING FLUOROAROMATIC COMPOUNDS USING BRANCHED ALKYL PYRIDINIUM SALTS
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(2008/06/13)

CATALYTIC METHOD FOR PRODUCING FLUOROAROMATIC COMPOUNDS USING SUBSTITUTED PYRIDINIUM SALTS
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(2008/06/13)

Preparation of fluoroaromatic compounds in dispersion of potassium fluoride
An improved process is disclosed for preparing fluoroaromatic compounds (such as fluoronitrobenzene compounds) wherein chloroaromatic compounds (such as chloronitrobenzene compounds) are reacted with potassium fluoride in a solvent dispersion thereof prepared from a mixture including the solvent, the fluoride, methanol and an aromatic compound.
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(2008/06/13)

CONVENIENT SYNTHESIS ROUTES TO 1,4-DIFLUOROANTHRACENE-9,10-DIONE
Two convenient synthetic routes to 1,4-difluoroanthracene-9,10-dione are described.
Krapcho, A. Paul,Getahun, Zelleka
p. 907 - 910
(2007/10/02)