El-Saied A. Aly

Preparation of poly(methyl methacrylate) based resins with bound chromium (VI) reagents and their use as oxidizing agents

Abstract Insoluble polymeric dichromate and chlorochromate reagents were prepared by modification of poly(methyl methacrylate-co-divinylbenzene) beads with ethylene diamine followed by treatment of the resulting resin with excess methyl iodide and subsequent reaction with aqueous chromium trioxide or chromium trioxide and benzyltriethylammonium chloride respectively. These polymeric reagents were found selectively to oxidize alcohols to the corresponding carbonyl compounds. In addition to easy work-up of the reaction mixture, the resulting polymeric by-product could be simply regenerated and re-used.

REACTION OF THIOPHENE DICARBOXALDEHYDES WITH p-AMINOACETOPHENONE: A NEW SYNTHESIS OF THIENOPYRROLE DERIVATIVES

Abstract The thiophene 3,4- and 2,3-dicarboxaldehydes react with p-aminoacetophenone in xylene to give N-(4-acetyl phenyl)-5,6-dihydro-4-oxo-4H-thieno[3,4-c] and [2,3-c]pyrroles. On the reaction of thiophene 2,3-dicarboxaldehyde in the presence of 2-mercaptoethanol, N-(4-acetyl phenyl)-2-thioalkyl-thieno[2,3-c]pyrrole and N-(4-acetyl phenyl)-2,5-dithioalkylthieno-[2,3-c]pyrrole are obtained, and characterized by 1H nmr and mass spectroscopy.