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  • Articles  (25)
  • Organic Chemistry  (18)
  • Industrial Chemistry and Chemical Engineering  (7)
  • Wiley-Blackwell  (25)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 239-241 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 19 (1996), S. 410-419 
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: General simple criteria to predict and analyze the influence on trickle-bed reactors behavior of three phenomena, namely, plug flow deviations, external wetting efficiency and external mass transfer resistance, are developed. Criteria predictions are compared with results arising from a comprehensive mathematical model widely employed to describe trickle-bed reactors behavior and with other particular criteria reported in the literature. Present criteria applications to different sets of experimental data exemplify their practical utility for various actual situations and verify their validity. Besides, they constitute simple tools to diagnose detrimental on trickle-bed reactors operation.
    Additional Material: 4 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 16 (1993), S. 35-39 
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Experimental data are reported for ion exchange equilibria of binary systems on Amberlite IR-120 resin, at different temperatures and total ionic concentrations in aqueous solutions. These systems exhibit non-ideal behaviour in both phases, and the equilibrium characterization has been based on the law of mass action, using Wilson and Meisssner, and Kusik equations to correlate the activity coefficients in the resin and aqueous solutions, respectively. Equilibrium constants, standard thermodynamic properties (Gibbs free enthalpy changes, enthalpy and entropy) and Wilson binary parameters were obtained as functions of temperature.
    Additional Material: 4 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 17 (1994), S. 210-215 
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The kinetics of the pseudohomogeneous liquid phase synthesis of a high molecular weight ester in a stirred tank reactor using cobalt chloride as catalyst has been studied at various temperatures, catalyst concentrations, and acid/alcohol molar ratios. A kinetic model has been determined that predicts the experimental results quite well.
    Additional Material: 7 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 8 (1996), S. 311-315 
    ISSN: 0899-0042
    Keywords: virtual triligand chiral center ; chirality of saturated heterocycles with six-membered ring ; rules for the specification of the configuration ; desymmetrization of adamantane ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chirality of the title heterocycles is discussed considering their genesis by desymmetrization of the corresponding adamantanes. Some rules for the specification of the absolute configurations of the enantiomers (R or S) for this type of compounds are proposed. © 1996 Wiley-Liss, Inc.
    Additional Material: 10 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1994 (1994), S. 629-631 
    ISSN: 0170-2041
    Keywords: Pyrazino[2,3-c][1,2,6]thiadiazine ; Triamterene, sulfur dioxide analog of ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis and X-ray analysis of a sulfur dioxide analog of the diuretic agent triamterene, namely 4,7-diamino-1-methyl-6-phenylpyrazino[2,3-c][1,2,6]thiadiazine 2,2-dioxide (2b), is reported. The compound is devoid of the diuretic properties found in other related pyrazino[2,3-c][1,2,6]thiadiazines.
    Additional Material: 1 Ill.
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  • 7
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Glycosylierungen von Pyrazino[2,3-c]-1,2,6-thiadiazin-2,2-dioxiden zu Schwefeldioxid-Analogen von Pteridin-NucleosidenDie Pyrazino[2,3-c]-1,2,6-thiadiazin-2,2-dioxide 1, 2 und 3 werden als Trimethylsilyl-Derivate mit 1-O-Acetylribose-Derivaten glycosyliert. 1 liefert ein Gemisch der N-1- und N-8-Monoriboside sowie das N-1,4-N-Diribosid, wobei die Produktverteilung von den Reaktionsbedingungen abhängt. Mit den 6,7-disubstituierten Pyrazino[2,3-c]-1,2,6-thiadiazinen 2 und 3 werden lediglich die N-1-Monoriboside gebildet. Die Strukturen der neu synthetisierten Verbindungen werden auf der Basis der UV-, 1H-NMR- und 2D-NMR-Spektren diskutiert und gesichert.
    Notes: Pyrazino[2,3-c]-1,2,6-thiadiazine 2,2-dioxides 1, 2, and 3 have been glycosylated as their trimethylsilyl derivatives with 1-O-acetyl derivatives of ribose. 1 leads to mixtures of N-1 and N-8 monoribosides and N-1,4-N diribosides, the relative proportions depending on the reaction conditions used. However, in the case of 6,7-disubstituted pyrazinothiadiazines 2 and 3 only the N-1 monoribosides have been obtained. The structures of the newly synthesized compounds are discussed on the basis of UV, 1H NMR and 2D homonuclear NMR data.
    Additional Material: 2 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 801-804 
    ISSN: 0170-2041
    Keywords: Cinnamamides, α-acetyl ; Malononitrile ; 4H-Pyrans ; Michael additions ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of α-acetylcinnamamides 7a-e with malononitrile using piperidine as the catalyst is described. When one or two equivalents of malononitrile are used, the 2-amino-4H-pyran 6a or the polyfunctionalized carbocycles 9b-e, respectively, can be isolated as major products, depending on the experimental conditions. Compounds 9b-e apparently arise from a sequential Michael plus Knoevenagel addition of two molecules of malononitrile followed by Thorpe cyclization. The structure of 9b was determined by an X-ray crystallographic analysis, which revealed a twisted cyclohexadiene ring with a characteristic crystal packing.
    Additional Material: 1 Ill.
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  • 9
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Einfluß der Enol-Acetylierung auf die Photo-Fries-Umlagerung eines Benzoesäure-ortho-acylarylestersDas Enolacetat 1b erleidet bei Bestrahlung Spaltung der Benzoyl-Sauerstoff-Bindung, wobei eine Mischung der Benzophenone 4 und 5 resultiert. Die primär entstehenden Photo-Fries-Produkte 2 und 3 konnten infolge einer schnellen intramolekularen Umacetylierung nicht isoliert werden. Das Acetophenon 6 lagert sich unter den gleichen experimentellen Bedingungen zu den Benzophenonen 7 und 8 um, jedoch sind die Ausbeuten bemerkenswert niedriger als im obigen Fall. Die Verbindungen 7 und 8 werden durch Acetanhydrid in Gegenwart von Pyridin in die jeweiligen Essigsäureester 4 und 5 übergeführt.
    Notes: The enol acetate 1b undergoes benzoyl-oxygen bond rupture upon irradiation, giving a mixture of benzophenones 4 and 5. The primary photo-Fries products 2 and 3 could not be isolated, due to a rapid intramolecular transacetylation. The acetophenone 6 rearranges to give the benzophenones 7 and 8 under the same conditions, but the yields are significantly lower than in the former case. Compounds 7 and 8 are separately correlated with 4 and 5 by treatment with acetic anhydride in the presence of pyridine.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 14 (1991), S. 105-108 
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A turntable dynamometer has been constructed for the accurate measurement of power input and mixing applications in bench stirred tank reactors. The main feature of this device is a pneumatic bearing with complementary conical parts. The conical pneumatic bearing permitted to apply eccentric loads without affecting its stability. The static friction torque in the pneumatic bearing was very small, 4 × 10-4 Nm, and can be neglected in the experimental ranges of measured torques, i.e. from 5 × 10-3 to 2.21 Nm. In accordance with the instrumentation used, the deviations obtained with the apparatus are less than 10% at low torque readings. At moderate torques, deviations lower than 1% are routinely obtained. Several power input measurements show that the obtained data scatter is lower than 2.5%. The power input response in the turbulent regime is in agreement with dimensional analysis: the power input depends on the cube of the impeller speed. In addition, data obtained with a turbine impeller under ungassed conditions agree with the predictions of a published correlation, which takes into account several geometrical parameters.
    Additional Material: 4 Ill.
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