An Efficient Method for the Synthesis of 3-Cyano-6-hydroxy-2(1 H )-pyridinones under Microwave Irradiation and Solvent-free Conditions
摘要:
Three component condensation of alkylacetoacetates, primary amines, and alkyl cyanoacetates catalyzed by solid supports under microwave irradiation gave N-alkyl 3-cyano-6-hydroxy-2(1H)-pyridinones with high yields. Upon carrying out the reaction under the same condition on acidic alumina, zeolite HY, silica gel, and montmorillonite K-10, the best yields were achieved by silica gel.
Agent and method for the oxidative coloring of keratin fibers
申请人:Pasquier Cecile
公开号:US20070079452A1
公开(公告)日:2007-04-12
The object of the present invention is a ready-to-use agent for coloring keratin fibers containing (i) at least one heterocyclic hydrazone derivative of formula (I), (ii) at least one CH-active compound of formulas (II) to (IX) and (iii) at least one oxidant, a multicomponent kit and a method for coloring keratin fibers by use of said agent.
observed because of the introduction of an electron-withdrawing carboxylic acid group at the ortho or para position in the phenyl ring.Graphical Abstract4-Aminobenzoic acid and 2-aminobenzoic acid have been used as the diazo components to couple with different N-substituted pyridone precursors to produce four pairs of isomeric aromatic heterocyclic dyes, for which 1H NMR spectral, UV–Vis spectral and
[EN] PARTICLES FOR ELECTROPHORETIC DISPLAYS<br/>[FR] PARTICULES POUR ÉCRANS D'AFFICHAGE ÉLECTROPHORÉTIQUES
申请人:MERCK PATENT GMBH
公开号:WO2012019704A1
公开(公告)日:2012-02-16
This invention relates to coloured polymer particles preferably with surface functionality for charge retention, a process for their preparation, the use of these particles for the preparation of an electrophoretic device, colour electrophoretic displays comprising such particle, and new polymerisable dyes.
Process for the manufacture of 6-hydroxypyrid-2-ones
申请人:Cassella Aktiengesellschaft
公开号:US04284782A1
公开(公告)日:1981-08-18
The manufacture of 6-hydroxypyrid-2-ones is achieved by reacting a cyanoacetamide with an acetoacetic acid ester at temperatures of 50.degree. to 200.degree. C. and a pressure of 0.5 to 50 bars in an aqueous solution or suspension in the presence of an amine in a molar amount at least equal to that of the cyanoacetamide reactant.