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Nucleophilic Reactions (nucleophilic + reaction)
Selected AbstractsNucleophilic Reactions in the N-Nitrooxazolidine Series.CHEMINFORM, Issue 9 2007A. S. Ermakov Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] ChemInform Abstract: Synthesis and Nucleophilic Reactions of N-(1-Naphthyl)-3,4-methylenedioxybenzylidinehomophthalisoimidium Perchlorate.CHEMINFORM, Issue 26 2002M. E. Azab Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Nucleophilic Reactions with ,-Trifluoromethyl Imine and N,O-Disubstituted Aminal: Synthesis of ,-Trifluoromethyl ,-Anilino Esters.CHEMINFORM, Issue 20 2002Yuefa Gong Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Some Nucleophilic Reactions with 6-Benzoyl-2,3-dichloroquinoxaline: Synthesis of Tetrazolo[1,5-a]quinoxaline, 2-Methylidene-1,3-dithiolo[4,5-b]quinoxalines, Quinoxalino[2,3-b]quinoxalines and Pyrazolo[1,,5,:1,2]imidazolo[4,5-b]quinoxalines.CHEMINFORM, Issue 26 2001M. S. A. El-Gaby Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Nucleophilic Substitution Reactions of meso -5,10,15-Tris(pentafluorophenyl)corrole; Synthesis of ABC-Type Corroles and Corrole-Based OrganogelsEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 12 2010Takaaki Hori Abstract Nucleophilic substitution reactions of 5,10,15-tris(pentafluorophenyl)corrole (1) with amines were examined as a post-modification route to functional corroles. Reaction of 1 with an excess of amine nucleophiles led to exclusive formation of 5,10,15-tris(4-amino-2,3,5,6-tetrafluorophenyl)-substituted corroles. In this nucleophilic reaction, 5- and 15-pentafluorophenyl substituents were found to be more reactive than the substituent at the 10-position. This substitution reaction was applied for the preparation of ABC-type corroles and corrole-based organogels. The latter exhibited a blue-shifted Soret band and small fluorescence quantum yields in nonpolar hydrocarbon solvents due to the formation of H-type aggregates. [source] Spiro-heterocycles from substituted pyridines, pyrans and thiopyransJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 6 2004Venkatapuram Padmavathi A new class of spiro-pyrimidines, pyrazoles and isoxazoles are prepared by nucleophilic reaction of 3,5-diaroyl-2,6-diaryl-piperidine-4,4-dicarbonitrile (1), 3,5-diaroyl-2,6-diaryl-tetrahydropyran-4,4-dicarbonitrile (2) and 3,5-diaroyl-2,6-diaryl-tetrahydrothiopyran-4,4-dicarbonitrile (3) with urea, N,N'-dimethyl urea, thiourea, hydrazine hydrate and hydroxylamine hydrochloride. [source] Preparation of new membranes based on sulfonated aromatic copolyimidesPOLYMERS FOR ADVANCED TECHNOLOGIES, Issue 5 2008Ahmad Rabiee Abstract New sulfonated aromatic copolyimides with controlled degree of sulfonation were prepared via polycondensation reactions of a sulfonated diamine and two unsulfonated diamines with 1,4,5,8-naphthalene tetracarboxylic dianhydride (NDA). The sulfonated diamine 3,3,-disulfonic acid- bis[4-(5-amino-1-naphthoxy)phenyl]sulfone (DANPS) was synthesized through nucleophilic substitution reaction of 5-amino-1-naphthol with disodium-3,3,-disulfonate-4,4,-dichlorodiphenysulfone (SDCDPS) and subsequent acidification. Two unsulfonated diamines 4,4,-(5-amino-1-naphthoxy)diphenylsulfone (ANDS) and 4,4,-(4-aminophenoxy)diphenylsulfone (APDS) were prepared by nucleophilic reaction of 5-amino-1-naphthol and 4-aminophenol with 4,4,-dichlorodiphenylsulfone in the presence of potassium carbonate, respectively. After characterization of the monomers and polymers with common methods, the physical properties of the polymers including thermal behavior and stability, viscosity, molecular weight, and ion exchange capacity (IEC) were studied. The polymers showed high thermal stability and ion exchange capacity which were the basic requirements for application as fuel cell membranes. Copyright © 2008 John Wiley & Sons, Ltd. [source] Ion chemistry of chloroethanes in air at atmospheric pressureRAPID COMMUNICATIONS IN MASS SPECTROMETRY, Issue 20 2001Anna Nicoletti Ion chemistry at atmospheric pressure is of major relevance to novel methods for the abatement of volatile organic compounds (VOCs) that employ non-thermal plasmas. For this reason, positive and negative APCI (atmospheric pressure chemical ionization) mass spectra of all six di-, tri- and tetrachloroethanes diluted in air (500,1500,ppm) at atmospheric pressure were investigated at 30,°C and at 300,°C. Spectral changes due to collisional activation of the ions achieved by increasing ,V, the potential difference between sampling and skimmer cones, are informative of structures and ion-molecule reactions. Positive ion chemistry of the chloroethanes (M) can, in general, be ascribed to C-C and C-Cl cleavages of the molecular ion, M+·, never detected but likely formed via exothermic charge exchange from primary ions of the APCI plasma. Exceptions to this characteristic pattern were observed for 1,1-dichloroethane and 1,1,2,2-tetrachloroethane, which give [M,,,H]+ and [M,,,HCl]+· species, respectively. It is suggested that both such species are due to ionization via hydride transfer. Upon increasing ,V, the [M,,,HCl]+· ion formed from 1,1,2,2-tetrachloroethane undergoes the same fragmentation and ion-molecule reactions previously reported for trichloroethene. A nucleophilic reaction of water within the [C2H4Cl+](H2O)n ionic complexes to displace HCl is postulated to account for the [C2H5O+](H2O)m species observed in the positive APCI spectra of the dichloroethanes. Negative ion spectra are, for all investigated chloroethanes, dominated by Cl, and its ion-neutral complexes with one, two and, in some cases, three molecules of the neutral precursor and/or water. Another common feature is the formation of species (X,)(M)n where X, is a background ion of the APCI plasma, namely O2,,O3, and, in some cases, (NO)2,. Peculiar to 1,1,1-trichloroethane are species attributed to Cl, complexes with phosgene, (Cl,)(Cl2C=O)n(n,=,1,2). Such complexes, which were not observed for either the isomeric 1,1,2-trichloroethane or for the tetrachloroethanes, are of interest as oxidation intermediates in the corona-induced decomposition process. No conclusions can be drawn in the case of the dichloroethanes, since, for these compounds, the ions (Cl,)(Cl2C=O)n and (Cl,)(M)n happen to be isobaric. Copyright © 2001 John Wiley & Sons, Ltd. [source] | ||||||||||