61799-28-8

Upstream product

• 138-89-6 p-dimethylaminonitrosobenzene 
• 89-25-8 edaravone 
• 117985-08-7 4-<<4-(dimethylamino)phenyl>-imino>-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one 

Downstream Products

• 21728-07-4 3-methyl-1-phenylpyrazolo<3,4-b>quinoxaline 
• 881-05-0 3-Methyl-1-phenyl-2-pyrazoline-4,5-dione 
• 13572-12-8 4-(p-dimethylamino)phenylamino-3-methyl-1-phenyl-2-pyrazolin-5-one 

Relevant academic research and scientific papers

A new regiospecific synthesis method of 1H-pyrazolo[3,4-b]quinoxalines – Potential materials for organic optoelectronic devices, and a revision of an old scheme

A series of 6-substituted-1,3-diphenyl-1H-pyrazolo[3,4-b]quinoxalines were prepared using a new synthetic pathway: reductive cyclization of appropriate 5-(o-nitrophenyl)-pyrazoles with ferrous oxalate or triphenylphosphine. The main advantage of this procedure is that, contrary to the older protocols of pyrazolo[3,4-b]quinoxaline synthesis, this method allows for a substituent to be introduced to the carbocyclic ring without the formation of isomers. The pyrazole ring can also be modified to some extent. Furthermore, we propose a new mechanism for the oldest reported pyrazolo[3,4-b]quinoxaline synthesis, based on the condensation between o-phenylenediamine and 3,4-pyrazolin-5-diones.

Spectroscopic Studies on 4-(p-Dimethylamino)benzylidene/phenylimino-3-methyl-1-phenyl-2-pyrazolin-5-ones

Electronic absorption spectra of 4-(p-dimethylamino)benzylidene/phenylimino-3-methyl-1-phenyl-2-pyrazolin-5-ones have been studied in polar and nonpolar solvents.HMO and PPP calculations have been undertaken to investigate the first ?* -- ? transition and the effect of replacement of carbon atom in 4-(p-dimethylamino)benzylidene-3-methyl-1-phenyl-2-pyrazolyn-5-one (I) by nitrogen atom as in 4-(p-dimethylamino)-phenylimino-3-methyl-1-phenyl-2-pyrazolin-5-one (II).The electron densities at various positions for the two compounds have been calculated by the SCF calculations.

New Kinetic Evidence for Inversional Mechanism in Thermal Geometrical Isomerization about Carbon-Nitrogen Double Bound

Kinetic pressure and solvent effects were studied for geometrical isomerization about carbon-nitrogen double bond in N,N-dimethyl-N'--1,4-benzenediamine and 4-imino>-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one.In both of the compounds, the effects clearly demonstrate that the polarity of the reactant decreases slightly during activation, and the results can hardly be reconciled with the previously proposed rotational mechanism.