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Synthesis of novel derivatives of 4-amino-3,5-dicyanopyrazole
Campos, Ana M. F. Oliveira; Gonçalves, M. Sameiro T.; Rodrigues, Lígia M.; Proença, M. Fernanda R. P.; Griffiths, John; Maia, Hernâni L. S.Diazotisation of substituted arylamines followed by reaction with malononitrile gave substituted arylazomalononitriles. Cyclisation of these intermediates with chloroacetonitrile and triethylamine, as base, gave the corresponding new aminodicyanopyrazoles, in 22–80% yields.
Synthesis of novel derivatives of a versatile synthon : 4-amino-3-cyanopyrazole
Rodrigues, Lígia M.; Campos, Ana M. F. Oliveira; Kaja, Martin; Hrdina, RadimDiazotisation of substituted arylamines followed by reaction with malononitrile gave substituted arylazomalononitriles. Cyclisation of these intermediates with two carbon sources and base gave the corresponding new 4-amino-3-cyanopyrazoles, in moderate yields. In one case the corresponding oxo-pyrazolopyrimidine was prepared.
Photocatalytic decolourisation of textile azo dyes
Miranda, Teresa; Soares, Graça M. B.; Campos, Ana M. F. Oliveira; Kaja, Martin; Hrdina, Radim; Machalicky, OldrichFour model dyes were synthesised using classical preparative techniques. They represent the molecular structures frequently used in the production of industrial textile mordant dyes. Dyes decolourisation was developed in a lab-scale thin film photoreactor equipped with a white lamp and quartz tube, in the presence of different semiconductors, such as TiO2, ZnO and Fe2O3. The quantum yields of photochemical degr...
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