Convenient and regiospecific synthesis of 2-substituted indol (3) by thermolysis of N-acylacetylphenylhydroxylamine (1 and its mechanism including the formation of a radical intermediate are reported.
Reaction of N-hydroxyacetoacetanilide with carbonyl reagents.
作者:KATSUMI TABEI、ETSUKO KAWASHIMA、TETSUZO KATO
DOI:10.1248/cpb.29.244
日期:——
The reaction of N-hydroxyacetoacetanilide derivatives (1a-g) with hydroxylamine in aqueous ethanol gave 3-methyl-4-arylhydrazono-5-isoxazolones (3a-g). When ethanol or chloroform was used as the reaction medium, the reaction of N-hydroxyacetoacetanilide (1a) with carbonyl reagents gave N-phenylhydroxylamine derivatives and five-membered heterocycles such as 3-methyl-5-isoxazolone or 3-methyl-5-pyrazolone derivatives. The mechanism of the formation of these products is discussed.
Multi-component system for modifying, degrading or bleaching lignin, lignin-containing materials or similar substances, includes
(a) if appropriate at least one oxidation catalyst;
(b) at least one suitable oxidizing agent; and (c) at least one mediator, wherein the mediator is chosen from the group consisting of N-aryl-N-hydroxyamides.
Oxidation system containing a macrocyclic metal complex, the production thereof and its use
申请人:Vogt Uwe
公开号:US20060217281A1
公开(公告)日:2006-09-28
Disclosed is an oxidizing system comprising a macrocyclic metal complex, an oxidizing agent and an oxidation-enhancing compound. This oxidizing system is useful under a wide variety of reaction conditions for oxidizing oxidizable substances by contacting the oxidizable substance with the specific oxidizing system. An example of a possible use is in a process for removing excess, unfixed dye from textile materials after a dyeing.