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  • Analytical Chemistry and Spectroscopy  (5)
  • Inorganic Chemistry  (5)
  • Chemical Engineering  (2)
  • Wiley-Blackwell  (12)
  • Copernicus
  • 1
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 592-606 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The problem of synthesizing processing systems via simultaneous structural and parameter optimization is addressed in this paper. Based on a superstructure representation for embedding alternative configurations, a general mixed-integer nonlinear programming (MINLP) framework is presented for the synthesis problem. An efficient outer-approximation algorithm is described for the solution of the underlying optimization problem, which is characterized by linear binary variables and continuous variables that appear in nonlinear functions. The proposed algorithm is based on a bounding sequence that requires the analysis of few system configurations, and the solution of a master problem that identifies new candidate structures. Application of the proposed algorithm is illustrated with the optimal synthesis of gas pipelines.
    Additional Material: 11 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 123-138 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A procedure is proposed for simultaneously handling the problem of optimal heat integration while performing the optimization of process flow sheets. The method is based on including a set of constraints into the nonlinear process optimization problem so as to insure that the minimum utility target for heat recovery networks is featured. These heat integration constraints, which do not require temperature intervals for their definition, are based on a proposed representation for locating pinch points that can vary according to every set of process stream conditions (flow rates and temperatures) selected in the optimization path. The underlying mathematical formulations correspond to nondifferentiable optimization problems, and an efficient smooth approximation method is proposed for their solution. An example problem on a chemical process is presented to illustrate the economic savings that can be obtained with the proposed simultaneous approach. The method reduces to simple models for the case of fixed flow rates and temperatures.
    Additional Material: 13 Ill.
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  • 3
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A new compound, obtained during the isolation of oligosaccharides from the urine of two brothers affected with inherited β-mannosidase deficiency, has been investigated using fast atom bombardment ionization and MS/MS techniques. The compound could be characterized as an N-acetylglucosamine molecule linked to a hexose and a urea molecule.
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 76-78 
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Phosphohydroxylysine a compound found in the urine of two patients with a possible inborn error of hydroxylysine metabolism, and related phosphohydroxycompounds were investigated with fast-atom bombardment tandem mass spectrometry techniques. This resulted in a reliable and quick identification method for phospho amino acids in general.
    Additional Material: 2 Ill.
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  • 5
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Inter-proton long-range and ring couplings were measured in o-anisaldehyde and in seven disubstituted anisoles. In order to investigate the transmission mechanisms of long-range couplings with the methoxy group, partially restricted molecular orbital (PRMO) calculations were carried out within the FPT-INDO method on o-anisaldehyde. σ- and π-electron, and through-space transmitted components were separated. For the energetically favoured trans-OMe conformation a through-space component was found for the couplings of the methyl protons with the ortho-proton, and it was found that its sign, as well as its magnitude, depends on their relative positions. If free rotation, however, is assumed for the methyl group, the averaged value for this coupling constant is negative.
    Additional Material: 2 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 8 (1974), S. 413-414 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectrometry of substituted benzenesulfonylhydrazides (X.C6H4.SO2NHNH2) has been studied, with X = p-CH3, H, p-CH3O and p-Br. The intensities of [X—C6H4SO2]+ and [X—C6H4]+ follow the Hammett relationship [In(Z/Z0) =ρδp+] with ρ of 0.375 and 2.37, respectively.
    Additional Material: 1 Tab.
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  • 7
    ISSN: 0044-2313
    Keywords: Electrochemical synthesis ; nickel(II) complexes of Schiff bases ; 2,2′ bipyridine bis 2-(phenyl)-iminomethyl pyrrolato nickel(II) ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Elektrochemische Synthese von Nickel(II)-Komplexen mit Schiffschen Basen: Kristallstruktur von 2,2′-Bipyridin-bis{2-[(phenyl)iminomethyl]pyrrolato}nickel(II)Die elektrochemische Oxidation von anodischem Nickel in einer Acetonitril-Lösung mit einer aus H-pyrrole-2-carbaldehyd abgeleiteten Schiffschen Base, einem substituierten Anilin und einem Stickstoff-Liganden (1,10-Phenanthroline (phen), 2,2′-Bipyridin (bipy) oder Pyridin (py)) liefert die gemischten Komplexe NiL2 · phen, NiL2 · bipy bzw. NiL2 · (py)2. Die Kristallstruktur von 2,2′-Bipyridin bis{2-[(phenyl)iminomethyl]-pyrrolato}nickel(II) wurde röntgenographisch bestimmt. Der. Komplex kristallisiert triklin in der Raumgruppe P1, mit den Gitterkonstanten a = 12,316(1), b = 13,169(4), c = 17,251(3) Å, α = 82,67(3)°, β = 83,66(1)°, γ = 87,34(2)°, Z = 4; besteht aus monomeren Molekülen mit der zentralen NiN6-Einheit mit verzerrt oktaedrischer Geometrie.
    Notes: The electrochemical oxidation of anodic nickel in acetonitrile solution containing both (a) a Schiff base HL derived from H-pyrrole-2-carbaldehyde and a substituted aniline, and (b) a nitrogen ligand (1, 10-phenanthroline (phen), 2,2′-bipyridine (bipy) or pyridine (py)) yielded the mixed complexes NiL2 · phen, NiL2 · bipy and NiL2 · (py)2. The crystal structure of 2,2′-bipyridine bis{2-[(phenyl)iminomethyl]pyrrolato}nickel(II) was determined by X ray diffraction. Crystals are triclinic space group P1, with four molecules in the unit cell of dimensions a = 12.316(1), b = 13.169(4), c = 17.251(3) Å, α = 82.67(3)°, β = 83.66(1)° and γ = 87.34(2)°, and consist of monomeric molecules in which the central NiN6 unit has a distorted octahedral geometry.
    Additional Material: 1 Ill.
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  • 8
    ISSN: 0044-2313
    Keywords: Electrochemical synthesis ; Schiff bases metal complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Elektrochemische Synthese von Metall(II)-Komplexen mit Schiffschen Basen: Kristallstruktur von Bis{2-[(4-methylphenyl)iminomethyl]pyrrolato}kupfer(II)Die elektrochemische Oxidation von anodischem Metall (Nickel, Kupfer, Zink, Cadmium) in einer Acetonitril-Lösung mit einer aus H-pyrrol-2-carbaldehyd abgeleiteten Schiffschen Base eines substitutierten Anilins (HL) liefert die gemischten Komplexe ML2. Die Kristallstruktur von Bis{2-[(4-methylphenyl)iminomethyl]pyrrolato}kupfer(II) wurde röntgenographisch bestimmt. Der Komplex kristallisiert monoklin in der Raumgruppe P21/n, a = 9,356(2), b = 16,697(2), c = 14,145(2) A, β = 108,47(2)°, Z = 4, und er besteht aus monomeren Molekülen, von denen die zentrale CuN4-Einheit eine verzerrt-tetraedrische Geometrie besitzt mit einem Diederwinkel der Flächen von 25,8(3)°. Die IR, 1H-NMR und UV-VIS Spektren werden im Zusammenhang mit der Struktur diskutiert.
    Notes: The electrochemical oxidation of anodic nickel, copper, zinc or cadmium in acetonitrile solutions of Schiff bases (HL) derived from H-pyrrole-2-carbaldehyde and substituted anilines gives compounds of general formula ML2. The crystal structure of bis{2-[(4-methylphenyl)iminomethyl]pyrrolato}copper(II) has been determined by X-ray diffraction. The compound crystallizes in the monoclinic space group P21/n with a = 9.356(2), b = 16.697(2), c = 14.145(2) Å and β = 108.47(2)°. The crystal structure consists of monomeric molecules in which the central CuN4 unit has distorted square-planar geometry with a dihedral angle of 25.8(3)° between the coordination planes. The IR, 1H NMR and UV-visible spectra of the complexes are discussed and related to the structure.
    Additional Material: 2 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 556 (1988), S. 223-226 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Elektrochemische Synthese von Zink- bzw. Cadmium-Komplexen mit 2-(N-2-Pyridyl-formimidoyl)phenol und seinen MethylderivatenDurch elektrochemische Oxydation des Metals als Anode in einer nicht-wäßrigen Lösung des entsprechenden Liganden werden in guter Ausbeute ZnII- bzw. CdII-Komplexe mit den Anionen von Schiffschen Basen hergestellt. Die Basen sind durch Kondensation von Salicylaldehyd mit verschiedenen 2-Aminopyridinen synthetisiert worden. Die Komplexe wurden durch Elementaranalyse, IR und 1H-NMR charakterisiert.
    Notes: Complexes of ZnII and CdII with the anionic forms of the Schiff bases obtained from the condensation between salicyladehyde and several 2-aminopyridines have been synthesized in good yield by electrochemical oxidation of the appropriate sacrificial anode in nonaqueous solution of the corresponding ligand. The resultant compounds have been characterised by elemental analysis, I.R., and 1H-N.M.R.
    Additional Material: 3 Tab.
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  • 10
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The identification of (E)-2-methylglutaconic acid, a ‘new’ metabolite of isoleucine, is described. The substance was detected in urine samples from patients with propionic acidaemia, methylmalonic acidaemia and so-called β-ketothiolase deficiency; in the majority of cases together with N-tiglylglycine. (E)-2-Methylglutaconic acid is thought to be the end product of the 3-methylcrotonyl-CoA carboxylase-catalysed carboxylation of tiglyl-CoA. Prerequisites for the quantitative gas chromatographic analysis of the unstable 2- (and 3-) methylglutaconic acid ditrimethylsilyl ester are given.
    Additional Material: 3 Ill.
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