M. M. Kandeel

Arylidene Polymers. Ii. Synthesis and Characterization of Some New Polyesters of Diarylidenecyclopentanone

Abstract New polyesters formed by interfacial polycondensation of 2,5-bis(4-hydrox-ybenzylidene)cyclopentanone (I) and 2,5-bis(4-hydroxy-3-methoxybenzyli-dene)cyclopentanone (II) with 4,47prime;-diphenic, isophthaloyl, terephthaloyl, adi-poyl, suberoyl, and sebacoyl dichlorides were obtained. The yield and the values of the reduced viscosity of the produced polyesters were found to be affected by the type of organic phase, the quantitative ratio of organic to aqueous phase, the concentration of the hydrogen chloride acceptor, and the contribution of benzyltriethylammonium chloride as a catalyst. In order to characterize these polymers, the necessary model compounds were prepared from I, II, and benzoyl chloride. The resulting polyesters were confirmed by IR, elemental analysis, viscometry, DTA, DSC measurements, and thermogravi-metric analysis. The crystallinities of all polyesters were examined by x-ray analysis, and the electrical properties of the polyesters were tested.

Organic Selenium Compounds, Part IV: Synthesis and Applications of Some New Diaryl Selenides Containing Azomethine and Oxazole Moieties

3,3′-Diacetyloxy (2), 3,3′-dihydroxy (3), 4,4′-diamino (4), and 4-amino (5) diphenylselenide derivatives were prepared as new precursors for the title studies. Compound 6 was obtained by condensation of 4 with an appropriate aromatic aldehyde. Unsymmetrical diphenylselenides 7 and 8 were obtained by condensation of 4 and/or 5 with an aromatic aldehyde. Compound 7 undergoes facile condensation with the same aldehyde present in its arylidene moiety to yield 6, while condensation with another different aromatic aldehyde yielded unsymmetrical 4-arylideneamino diphenylselenide derivative 9. Oxidation of 6, 8, and 9 using lead tetra acetate and/or N-bromosuccinimide yielded symmetrical bis-(2-aryl benzoxazol-6-yl) (10), unsymmetrical 3′-hydroxy, 2-aryl benzoxazol-6-yl selenides (11), and 2-aryl benzoxazol-6-yl, 2′-aryl′ benzoxazol-6′-yl selenide derivatives (12), respectively. Compound 10 was prepared in one-pot unequivocal synthesis by fusion of 4 with the appropriate aromatic aldehyde, while 12 was prepared by fusion of 4 with two different aromatic aldehydes. In certain cases, 6 and 9 were heated on a direct flame until complete homogeneity afforded the corresponding 10 and 12. The structures of the synthesized compounds are based on physical data, IR, 1H NMR, 13C NMR, chemical means, and mass spectral data. Some of the synthesized compounds were biologically tested. Supplemental materials are available for this article. Go to the publishers online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.

BASE CATALYSED LOSSEN REARRANGEMENT OF N-SULPHONYLOXY-2,3-NORBORN-5-ENEDICARBOXIMIDE

Abstract N-Sulphonyloxy-2,3-norborn-5-enedicarboximide 1 underwent Lossen rearrangement with some nucleophilic reagents, but it failed to undergo Beckmann rearrangement.

The Utility of Diaryl Sulfides and Diaryl Sulfones in Heterocyclic Synthesis [1993–2003]

Abstract The present review selectively describes the work, generally, reflecting the recent current state of knowledge about the utility of diaryl sulfides and diaryl sulfones in heterocyclic synthesis while emphasizing important development methods, main reactions, and their applications.

COMPLEXING ABILITY OF SOME 2-PYRAZOLINE- 4-DITHIOCARBOXYLIC ACID DERIVATIVES

Abstract Substituted 2-pyrazoline-4-dithiocarboxylic acid complexes with Cu(II), Ni(II), Co(II), La(III), Ce(III), Th(IV) and UO2(II) have been isolated. The structures of the complexes are recognized by elemental analyses, thermal decomposition, electronic and IR spectral data as well as conductance measurements. The ligands are coordinated to the metal ions as monovalent bidentate ligand. Thermogravimetric studies indicate that these complexes are stable up to 180°C and undergo complete decomposition in the range 180–430°C resulting in the formation of stable metal oxides. In Th(IV), Ce(III), or La(III) nitrate complexes, nitrate ions are bidentately coordinated to the metal ion, resulting in the formation of six-coordinate nitrato complexes. The formula of the complexes suggests that, uranyl ion has a coordination number of six. This is achieved by coordination of two molecules of the bidentate title ligands in addition to the two water molecules which have already been bonded to the UO2(II) species. A...