The synthesis of trianglimines: on the scope and limitations of the [3 + 3] cyclocondensation reaction between (1R,2R)-diaminocyclohexane and aromatic dicarboxaldehydes
作者:Nikolai Kuhnert、Giulia M. Rossignolo、Ana Lopez-Periago
DOI:10.1039/b212102f
日期:2003.3.27
The synthesis of aromatic dicarboxaldehydes, using dilithiation methodology is described along with their reactivity, in the [3 + 3] cyclocondensation reaction, with (1R,2R)-diaminocyclohexane to give trianglimine macrocycles. The scope and limitations of the cyclocondensation reaction are studied and some comments on the properties of the novel macrocycles are made such as their conformation in solution
Formylation and dichloromethylation as alternative directions of rieche reaction. A novel to the synthesis of sterically hindered aromatic dialdhydes
作者:Alexander P. Yakubov、Dmitry V. Tsyganov、Leonid I. Belen'kii、Mikhail M. Krayushkin
DOI:10.1016/s0040-4020(01)90166-8
日期:1993.4
previously unknown direction of Rieche reaction has been found: formylation of mesitylene, m-xylene, and durene with dichloromethyl methyl ether in the presence of aluminium trichloride and, to lesser extent, of titanium tetrachloride give the respective benzylidene dichlorides besides aldehydes. A novel approach to the synthesis of stericallyhinderedaromatic dialdehydes has been offered which involves
Nitrile oxide compounds are extremely reactive toward multiple bonds in organic compounds and polymers. This high level of reactivity allows for dinitrile oxides to cure (crosslink) olefin-containing polymers under very mild conditions. This invention discloses a process for the synthesis of stable aryl nitrile oxides which comprises the sequential steps of (1) halomethylating a halomethyl group onto a substituted aromatic compound having at least one substituent group selected from the group consisting of alkyl groups, aryl groups, fused aryl groups, alkaryl groups, halogen atoms, alkoxy groups and nitro groups, wherein said halomethyl group is halomethylated onto a position that is ortho to at least one of the substituent groups on the substituted aromatic compound; (2) converting the ortho halomethylated-substituted aromatic compound into an ortho-substituted aromatic aldehyde by reacting the ortho halomethylated-substituted aromatic compound with a salt selected from the group consisting of sodium 2-nitropropane and potassium 2-nitropropane in a lower alcohol solvent; (3) converting the ortho-substituted aromatic aldehyde into an ortho-substituted aromatic oxime by reacting the ortho-substituted aromatic aldehyde with hydroxylamine; and (4) converting the ortho-substituted aromatic oxime into the ortho-substituted aryl nitrile oxide by reacting the ortho-substituted aromatic oxime with an aqueous sodium hypochlorite solution at a temperature which is within the range of about -5°C to about 20°C.
Utilisation de diamines comportant au moins un groupe quaternisé et de dialdéhydes pour la teinture des fibres kératiniques
申请人:L'OREAL
公开号:EP1386603A1
公开(公告)日:2004-02-04
Composition de teinture des fibres kératiniques prête à l'emploi, préparée extemporanément, comprenant, dans un milieu approprié pour la teinture,
au moins un dialdéhyde choisi parmi ceux de formule (I) ou (II)
où A représente un groupe carbocyclique ou hétérocyclique portant éventuellement un ou plusieurs substituants halogéno, alkyle en C1-6, hydroxyle, alcoxy en C1-6, thiol, aldéhyde, acide carboxylique, nitro, sulfo ou hétérocyclique azoté, et
au moins une diamine à groupes quaternisé(s),
des kits multi-compartiments contenant de tels composés, et des procédés de teinture des fibres kératiniques utilisant de tels kits ou une telle composition.
用于染色角蛋白纤维的即用型组合物,可即刻制备,在适于染色的介质中包括
至少一种选自式 (I) 或 (II) 的二醛
其中 A 代表可选被一个或多个卤素、C1-6 烷基、羟基、C1-6 烷氧基、硫醇、醛、羧酸、硝基、硫或含氮杂环取代基取代的碳环或杂环基团,以及
至少一种带季铵化基的二胺、
含有此类化合物的多格试剂盒,以及使用此类试剂盒或此类组合物对角蛋白纤维进行染色的工艺。
Aryllithiums with Increasing Steric Crowding and Lipophilicity Prepared from Chlorides in Diethyl Ether. The First Directly Prepared Room-Temperature-Stable Dilithioarenes
作者:Constantinos G. Screttas、Barry R. Steele、Maria Micha-Screttas、Georgios A. Heropoulos
DOI:10.1021/ol302672n
日期:2012.11.16
A convenient procedure has been developed for the preparation of synthetically useful, room-temperature-stable aryllithiums starting from aryl chlorides and lithium metal. The method provides a route to aryllithiums which have previously not been accessible cleanly or could only be prepared by using more expensive starting materials.