Iodine-Catalyzed Diazenylation with Arylhydrazine Hydrochlorides in Air
作者:Dinesh S. Barak、Shashikant U. Dighe、Ilesha Avasthi、Sanjay Batra
DOI:10.1021/acs.joc.7b03149
日期:2018.4.6
A mildapproach to diazenylation of active methylene compounds and N-heterocyclic compounds with arylhydrazine hydrochlorides in the presence of iodine under basic aerobic conditions was developed. The reaction could be executed either under heating or in the presence of blue LED light, though the latter condition was found to be relatively efficient. Presumably, the aryldiazene produced by oxidation
The reaction of ethyl benzoylacetate with malononitrile: a novel synthesis of some pyridazine, pyridazino[2,3- a ]quinazoline and pyrrole derivatives
作者:Fathy M Abdelrazek、Abdellatif M Salah El-Din、Ahmed E Mekky
DOI:10.1016/s0040-4020(00)01153-4
日期:2001.2
and coupled with diazonium salts to afford azo derivatives. These azo derivatives and those of ethyl benzoylacetate could be cyclized into 4-oxo-, 6-oxo- and 6-iminopyridazines and pyridazino[2,3-a]quinazolines, respectively. The 6-iminopyridazines could be transformed into the 6-oxopyridazines. The imino- and oxopyridazines could be transformed into pyrrole derivatives.
Photoisomerisation d'arylhydrazones-2 de dicetones-1,2 substituees en 2.
作者:R. Pichon、J. Le Saint、P. Courtot
DOI:10.1016/s0040-4020(01)92091-5
日期:1981.1
A syn-anti photoisomerisation of the carbon-nitrogendoublebond is responsible for the photochromic properties observed with 2-arylhydrazones of 2-substituted 1,2-diketones. We have determined the multiplicity of the excited state involved in the process and we have shown that, in the thermal back-reaction, syn-anti isomerisation takes place through rotation around the CN bond rather than through