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(searched for: (10.5155/eurjchem.2.1.25-35.208))
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Salah Abdel-Ghaffar Abdel-Aziz, Tarik El-Sayed Ali, Kamilia Mohamed El-Mahdy, Somaia Mohamed Abdel-Karim
European Journal of Chemistry, Volume 2, pp 25-35; doi:10.5155/eurjchem.2.1.25-35.208

Abstract:
Vilsmeier-Haack reaction conditions were applied on some methyl ketone aryl phosphonicdihydrazones to yield some interesting bis-pyrazole derivatives containing a hydro-phosphoryl unit. Bis-{4-formyl-3-aryl-1H-pyrazol-1-yl}phosphine oxides (4a,b) were condensed with some nucleophiles such as aniline, phenacyltriphenylphosphonium bromide and 4-phenylthiosemicarbazide followed by treatment with thioglycolic acid, diethyl phosphite and/or acetic anhydride to yield a novel class of bis-pyrazoles containing sulfur and phosphorus derivatives. Most of the newly synthesized compounds were evaluated for their in vitro antimicrobial activities.
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