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Synthesis of esters derived from 2,3,4-tri-O-benzyl-alpha-D-methylglucoside
Pinto, Tiago A. D.; Hrdina, Radim; Kirsch, G.; Campos, Ana M. F. Oliveira; Rodrigues, Lígia M.; Esteves, Ana Paula2,3,4-Tri-O-benzyl-alpha-D-methylglucoside was prepared and reacted with several acids: benzoic, phenylacetic, 2-(3-bromo-propoxy)-benzoic, acetylsalicylic and 4-(toluene-4-sulfonylamino)-benzoic. The products were isolated with low to fair yields and fully characterized by usual analytical techniques.
Synthesis of esters derived from 2,3,4-tri-O-benzyl-alpha-D-methylglucoside
Pinto, Tiago A. D.; Hrdina, Radim; Kirsch, G.; Campos, Ana M. F. Oliveira; Rodrigues, Lígia M.; Esteves, Ana PaulaThe synthesis of a set of esters obtained from the D-glucose derivative by reaction with several carboxylic acids: benzoic, phenylacetic, acetylsalicylic, 2-(3-bromopropoxy)benzoic acid and 4-(toluene-4- sulfonylamino)benzoic acid.
Synthesis of esters derived from [4-(2-hydroxyethyl)-[1,2,3]triazol-1-yl]-2,3,4...
Pinto, Tiago A. D.; Silva, Marília E.; Cunha, S.; Rodrigues, Lígia M.; Campos, Ana M. F. Oliveira; Hrdina, Radim; Esteves, Ana PaulaThe synthesis of six novel esters containing a triazole ring and an acetylated glucose residue are presented
Naphthotriazole derivatives : synthesis and fluorescence properties
Campos, Ana M. F. Oliveira; Rodrigues, Lígia M.; Esteves, Ana Paula; Silva, Marília E.; Sivasubramanian, Aravind; Hrdina, Radim; Soares, Graça M. B.Eight fluorescent compounds containing a naphthotriazole moiety substituted at position 2 by a (vinylsulfonyl)aryl group or its precursors, containing hydroxyl or sulphonic groups or N-methylglycine, were prepared and characterized. The products were recovered in moderate yields after column chromatography or recrystallization and identified by proton and carbon nuclear magnetic resonance spectroscopy. Double r...
A study on the spectral changes of reactive textile dyes and their implications...
Santos, Jorge Gomes; Soares, Graça M. B.; Hrdina, Radim; Campos, Ana M. F. Oliveira; Gomes, Jaime RochaEvidence is presented that confirms the colour changes of a widely used trichromatic mixture of bifunctional reactive dyes (Levafix CA) under alkaline conditions, showing that they occur slowly and throughout the dyeing time, and not instantly after alkali addition to the dyebath. Thus, it is impossible to determine the specific absorptivity of the dyes at each moment of the dyeing process. An investigation int...
Synthesis of dyes derived from 1-aryl-5-amino-4-cyanopyrazoles
Gupta, Sanjay; Sivasubramanian, Aravind; Rodrigues, Lígia M.; Esteves, Ana Paula; Hrdina, Radim; Campos, Ana M. F. OliveiraProva tipográfica (In Press) ; Eight dyes were prepared by diazotisation of substituted amino-cyano pyrazoles and coupling to anilines or 2-naphthol. The dyes were fully characterised by spectroscopic techniques. The cyano group of the pyrazoles was found to be susceptible to hydrolysis during preparation.
Photodegradation studies on C. I. reactive red 158
Miranda, Teresa; Hrdina, Radim; Oldrich, Machalicky; Campos, Ana M. F. OliveiraDye-containing wastewater generated from textile industries is a major source of environmental pollution. Azo dyes, which are the largest group of coloring agents, are widely used in industry. Advanced Oxidative Processes are very promising for effluent treatment mainly due to their high efficiency and simplicity of operation. Our group became interested on photocatalytic methods (included in the AOP’s), using ...
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 treatment of C. I. Reactive Red 2
Campos, Ana M. F. Oliveira; Gonçalves, M. Sameiro T.; Pinto, Elisa M. M. S.; Amorim, M. T. Pessoa de; Hrdina, Radim; Machalicky, OldrichPolychromatic photo degradation of C.I. Reactive Red 2 in aqueous solutions was studied in the presence of TiO2. The influence of several factors, such as pH value, irradiation time, amount of dye and TiO2 was observed in the process. The dye degradation was monitored by visible absorption spectroscopy and Chemical Oxygen Demand (COD) determinations. It was found, that the mineralization of the dye strongly dep...
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