Chemical Simulation of Biogenesis of the 2,4,5-Trihydroxyphenylalanine Quinone Cofactor of Copper Amine Oxidases: Mechanistic Distinctions Point toward a Unique Role of the Active Site in the <i>o</i>-Quinone Water Addition Step
作者:Subrata Mandal、Younghee Lee、Matthew M. Purdy、Lawrence M. Sayre
DOI:10.1021/ja992886g
日期:2000.4.1
surprising finding that water addition does not occur under solution chemistry conditions. The production of hydroxyquinone from catechol arises instead from reaction of the o-quinone with H2O2 generated during autoxidation of catechol. When starting with the o-quinone itself, production of hydroxyquinone still arises from autoxidation of the catechol, generated either by reduction of the o...
Preparation of muconic acid mononitriles and copper(II)-ammonia reagent therefor
申请人:ALLIED CORPORATION
公开号:EP0009369A1
公开(公告)日:1980-04-02
Substituted and unsubstituted phenols, catechols and orthobenzoquinones are converted to muconic acid mononitriles by reaction with copper(II)-ammonia reagent. The copper(II)-ammonia reagents can be prepared by the reaction of cuprous chloride with oxygen or air in liquid ammonia or in ammonium hydroxide or in pyridine followed by addition of ammonia or ammonium hydroxide. The muconic acid mononitriles are useful as monomers or comonomers and as intermediates in the manufacture of substituted and unsubstituted 6-aminocaproic acids, caprolactams and polyamides.