- Synthesis and Electronic Absorption Spectra of Some Five-Membered Bisheterocyclic Polymethine Cyanine Dyes
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3,5-Dimethyl-1-phenyl-1H-pyrazolooxazole 5 was prepared and used as starting material in the synthesis of some polymethine cyanine dyes incorporating a biheterocyclic system.The chemical structure of the new polymethine cyanines were identified based on their elemental analysis and spectral data.The electronic absorption spectra of the synthesized cyanine dyes are discussed.
- El-Aal, Reda Mahmoud Abd
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p. 850 - 865
(2007/10/03)
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- Synthesis of Pyrazolooxazoles
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1-Phenyl-3-methyl-5-pyrazolone-4-oxime reacted with benzylamine, methylamine, methyl- and ethyl iodides to give 3-methyl-1,5-diphenyl-1H-, 3-methyl-1-phenyl-1H- and 3,5-dimethyl-1-phenyl-1H-pyrazolooxazoles I,II.The structure of I was elucidated authentically through other routes by interaction of 1-phenyl-3-methyl-4,5-dioxopyrazolone with benzylamine and/or benzaldehyde and ammonium acetate.Various 3-methyl-5-aryl-1-phenyl-1H-pyrazolooxazoles IV were synthesized by the reaction of 4,5-dioxopyrazolone with aromatic aldehydes in the presence of ammonium acetate.Also, the structure of I was elucidated authentically via other routes by the reaction of 1-phenyl-3-methyl-4-imino-5-pyrazolone with each of benzylcyanide, benzylamine, benzaldehyde and benzalaniline.
- Youssef, M. S. K.,Metwally, S. A. M.,El-Maghraby, M. A.,Younes, M. I.
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p. 1747 - 1752
(2007/10/02)
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