Synthesis And Reactions Of Pyrazoldouinoxalines

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Synthesis And Reactions Of Pyrazoldouinoxalines

Show simple item record Sanjeev Bhat, V Dr.Madhavan Pillai, P 2014-04-03T08:46:57Z 2014-04-03T08:46:57Z 1989-12-04
dc.description Department Of Applied Chemistry Cochin University Of Science And Technology en_US
dc.description.abstract The present work reports the synthesis of 2-ary1—3—oxo-3—pyrazolino[3,4-b]quinoxalines for the first time. These compounds have been prepared by the reaction of ethyl 2-chloroquinoxaline—3—carboxylate with different phenylhydrazines. 2-Aryl—3-oxo—3—pyrazolino[3,4—b]quinoxalines are generally light yellow in either neutral or acid solutions but changed the colour to deep violet or green in basic media. The change in colour appears to be sharp and therefore these compounds may be used as acid base indicators. Their UV absorption maxima under acidic and basic media are also very different. However, the actual conditions under which these compounds may be used as indicators have not been worked out. The synthesis and reactions of a new heterocyclic system, lH—l,5—benzodiazepino[2,3—b]quinoxaline is also reported here. This novel nitrogen heterocycke was prepared by the condensation of ethyl 2-chloroquinoxaline-3—carboxylate with o-phenylene diamine and subsequent manipulationsa to give the parent compound. Several derivatives which are expected tx> have valuable biological properties have also beenlreported. The structures of all new compounds have been established by elemental analysis and also by analysing their spectral data smch as ultraviolet, infrared, nuclear magnetic resonance and mass spectrometry. Compounds obtained from this work will be submitted for screening their biological properties. en_US
dc.description.sponsorship Cochin University Of Science And Technology en_US
dc.language.iso en en_US
dc.publisher Cochin University Of Science And Technology en_US
dc.subject Pyrazoloquinoxalines en_US
dc.subject Substitution reactions en_US
dc.subject Oxidation reaction en_US
dc.subject Chlorination. en_US
dc.title Synthesis And Reactions Of Pyrazoldouinoxalines en_US
dc.type Thesis en_US

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