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2 International Letters of Chemistry, Physics and Astronomy

2 2014

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Insect antifeedant potent unsaturated 1,3-oxazine-2-amines

Thirunarayanan G., Renuka V., Sekar K.G., Lakshmanan K., Anbarasu K.

International Letters of Chemistry, Physics and Astronomy

2014

Vol. 4

66--81

Insect antifeedant activities of some halo substituted aryl 1,3-oxazine-2-amines have been measured using 4th instar larvae Achoea Janata L by castor leaf discs-Dethler’s method. The highly halo substituted oxazine amines have shown good insect antifeedant activities. The 1,3-oxazine amines have been synthesised by greener method by solvent-free cyclization of aryl enones with urea under microwave irradiation. The yields of the oxazines were more than 80 %. The synthesised oxazines were characterized by their physical constants, analytical and spectroscopic data.

Easy, Simplistic and Green Synthesis of Various Benzimidazole and Benzoxazole Derivatives Using PEG400 as a Green Solvent

Khunt M. D., Kotadiya V. C., Viradiya D. J., Baria B. H., Bhoya U. C.

International Letters of Chemistry, Physics and Astronomy

2014

Vol. 6

61--68

An improved environmentally benign procedure for the synthesis of various benzimidazole and benzoxazole derivatives using green solvent PEG400. We have optimized the reaction condition and it was found that PEG400 was believed to be best as compared to PEG200, PEG600 and PEG800 at 80 to 85 °C. This method provides a novel route for the synthesis of benzimidazole and benzoxazole derivatives. The main attractive features of this process are a mild reaction conditions, easy workup procedure and good to excellent yield. The structures of all the synthesized compounds were confirmed by 1H NMR, IR, MASS and Elemental Analysis.