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  • Chemistry  (24)
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  • 1
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Silyl-Komplexe, 44. Darstellung der zweikernigen Silyl-Komplexe (CO)3(R3Si)Fe(μ-PR′R′′)Pt(PPh3)2 durch oxidative Addition von (CO)3(R′R′′HP)Fe(H)SiR3 an (C2H4)Pt(PPh3)2 (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 17-21 
    Details
    ISSN: 0009-2940
    Keywords: Dinuclear complexes ; Iron complexes ; Platinum complexes ; Silyl complexes ; Phosphide bridges ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition Metal Silyl Complexes, 44.  -  Preparation of the Binuclear Silyl Complexes (CO)3(R3Si)Fe(μ-PR′R′′)Pt(PPh3)2 by Oxidative Addition of (CO)3(R′R′′HP)Fe(H)SiR3 to (C2H4)Pt(PPh3)2The complexes (CO)3(R′R′′HP)Fe(H)SiR3 (1) [PHR′R′′ = PHPh2, PH2Ph, PH2Cy; SiR3 = SiPh3, SiPh2Me, SiPhMe2, Si(OMe)3] react with Pt(C2H4)(PPh3)2 to give the dinuclear, silyl-substituted complexes (CO)3(R3Si)Fe(μ-PR′R′′)Pt(PPh3)2 (2) in high yields. Upon reaction of 2 (R = R′ R′′ = Ph) with CO, the PPh3 ligand at Pt being trans to the PPh2 bridge is exchanged, and (CO)3(Ph3Si)Fe(μ-PPh2)Pt(PPh3)CO (3) is formed. Complex 3 is characterized by an X-ray structure analysis. The rather short Fe  -  Si distance [233.9(2) pm] and the infrared spectrum of 3 indicate that the Fe  -  Pt bond is quite polar.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260104
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  • 2
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Silyl-Komplexe, 48. Synthese neuartiger heteronuklearer Silyl-Zweikernkomplexe (OC)3(R3Si)Fe(μ-PR′R″)Pt(1,5-COD)(Fe-Pt), Phosphan-Austauschreaktionen an (OC)3 (R3Si)Fe(μ-PR′R″)Pt(PPh3)2(Fe - Pt) und Darstellung der Dihydrido-Komplexe [(OC)3Fe(μ-PPh2)(μ-H)2Pt(PR3)2][BF4](Fe - Pt) (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 295-304 
    Details
    ISSN: 0009-2940
    Keywords: Heterobimetallic complexes ; Iron complexes ; Platinum complexes ; Silyl complexes ; Phosphido bridges ; Hydrido complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition Metal Silyl Complexes, 48[1]. - Synthesis of the New Heterobimetallic Dinuclear Silyl Complexes (OC)3(R3Si)-Fe(μ-PR′R″)Pt(1,5-COD)(Fe-Pt), Phosphane Exchange Reactions of (OC)3(R3Si)Fe(μ-PR′R″)Pt(PPh3)2(Fe-Pt), and Preparation of the Dihydrido complexes [(OC)3Fe(μ-PPh2)(μ-H)2Pt(PR3)2][BF4](Fe-Pt)The dinuclear, silyl-substituted complexes (OC)3(R3Si)Fe(μ-PR′r″)Pt(1,5-COD) (1) [μ-PR′R″ = PPh2, PCY2, PHPh; SiR3 = SiPh3, Si(OMe)3] were prepared in high yields by the oxidative addition of the hydrido complexes (OC)3(PHR′R″)Fe(H)-SiR3 to Pt(1,5-COD)2. Upon reaction of (OC)3(R3Si)Fe(μ-PR′R″)Pt(PPh3)2 [μ-PR′R″ = PPh2, PHCy; SiR3 = SiPh3, SiPh2Me, SiPhMeCl, Si(OMe)3] with two equivalents of PR‴3 (PMe3, PBu3, PEt3) or with one equivalent of chelating di-phosphanes (vdpp, dppe, dppm) both PPh3 ligands are displaced, and (OC)3(R3Si)Fe(μ-PR′R″)Pt(PR‴3)2 or (OC)3(R3Si)-Fe(μ-PR′R″)Pt[(PPh2)2X] (X = C=CH2, C2H4, CH2) are formed, respectively. When one equivalent of PMe3 is used, only the PPh3 ligand trans to the μ-PPh2 bridge is substituted, and (OC)3(Ph3Si)Fe(μ-PPh2)Pt(PPh3)(PMe3 is formed. The 1,5-COD ligand in 1 is displaced by P(OR)3 to give (OC)3-(Ph3Si)Fe(μ-PPh2)Pt[P(OR)3]2 (R = Me, Ph). The complexes (OC)3(Ph3Si)Fe(μ-PPh2)Pt(PMe3)2and (OC)3(Ph3Si)Fe(μ-PPh2)Pt[(PPh2)2C=CH2] were characterized by X-ray structure analysis. The short Fe-Si distances [233.0(2) and 235.6(3) pm] and the infrared v(CO) absorptions indicate that the Fe-Pt bonds are quite polar. Protonation of (OC)3(Me2-PhSi)Fe(μPPh2)Pt(PPh3)2 with CF3COOH gives the hydrido-bridged complex [(OC)3(Me2PhSi)Fe(μ-PPh2)(μ-H)Pt-(PPh3)2][O2CCF3]. Upon addition of an excess of HBF4 · Et2O to (OC)3(R3Si)Fe(μ-PPh2)Pt(PPh3)2 (R = Ph, OMe), (OC)3-Si)Fe(μ-PPh2)Pt[Pt[P(OMe)3]2 or (OC)3(Ph2MeSi)Fe(μ-PPh2)-Pt(dppe) R3SiF is split, and the corresponding μ-dihydrido complexes [(OC)3Fe(μ-PPh2)(μ-H)2Pt(PR3)2][BF4] are obtained.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270204
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetics of Dimerization of Amines by hydrogen peroxide in the presence of ferrous sulphate as catalyst (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 23-28 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kinetik der Dimerisierung von Aminen durch Wasserstoffperoxid in Gegenwart von Fe(II)SO4 als KatalysatorDie Kinetik der Dimerisierung von Diethyl, n-Butyl- und tert.-Butylamin durch Wasserstoffperoxid in Gegenwart von Fe(II)-Ionen wurde untersucht. Die Reaktion ist bezüglich Fe(II)-Ionen und der Amine 1. Ordnung und 0. Ordnung betreffs Wasserstoffperoxid. Produkte der Dimerisierungsreaktionen sowie einige ihrer kristallinen Derivate wurden erhalten und identifiziert. Die Aktivierungsenergien für Diethyl-, n-Butyl- und tert.-Butylamin betragen 153, 130 bzw. 105 KJ mol-1. Ein Reaktionsmechanismus wurde aufgrund der experimentellen Beobachtungen vorgeschlagen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260104
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  • 4
    Electronic Resource
    Electronic Resource
    Strontium sulfate precipitation from electrolyte solutions (1994)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 40 (1994), S. 1422-1425 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690400815
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  • 5
    Electronic Resource
    Electronic Resource
    Biomass ethanol as a chemical feedstock in the United States (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 22 (1980), S. 677-679 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260220318
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  • 6
    Electronic Resource
    Electronic Resource
    Design and operation of a simple continuous-culture apparatus (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 8 (1966), S. 183-188 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A versatile and simple continuous-culture apparatus is described. With this apparatus, independent control of limiting growth factors and other nutrilites is possible and the conditions of each experiment are reproducible. In view of the synchronized speed of the feeder syringes, flow variation troubles are not encountered. The device allows the performance of growth experiments at different dilution rates simultaneously in a single run which makes the comparison of the results more reliable. The operation of the device has been tested successfully with a study of adenine deaminase induction in yeast.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260080115
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  • 7
    Electronic Resource
    Electronic Resource
    Enantioselective separation of enantiomeric amides on three amylose-based chiral stationary phases: Effects of backbone and carbamate side chain chiralities (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 9 (1997), S. 173-177 
    Details
    ISSN: 0899-0042
    Keywords: chiral high-performance liquid chromatography ; polysaccharides ; structure-retention relationships ; amides ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of enantiomeric amides have been chromatographed on three amylose-based chiral stationary phases (CSPs): amylose tris(3,5-dimethylphenylcarbamate) (AD-CSP), amylose tris (S-phenylethylcarbamate) (AS-CSP), and amylose tris(R-phenylethyl-carbamate) (AR-CSP). The relative retentions and enantioselectives of the solutes on the three CSPs were compared and basic structure-retention relationships developed to describe the chromatographic results. The data indicate that for these solutes the observed elution order was a function of the chirality of the amylose backbone, while the magnitude of the enantioselective separations was affected by the chirality of the carbamate side chain. Chirality 9:173-177, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 1 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Odour evaluation, fraction collection and preparative scale separations with glass capillary columns (1980)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 3 (1980), S. 107-114 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Two-dimensional GC ; Odour evaluation ; Fraction collection, heart-cutting and enrichment ; Applications, essential oil analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple but effective GC approach to odour evaluation and fraction collection with capillary columns is described. An allglass device splits the column effluent, with one splitter arm going to an FID. For odour evaluation, the other splitter arm is led via teflon tubing to the nose. Off-line heart-cutting is carried out by collecting the split effluent on a glass capillary microtrap, the inner walls of which are coated with OV-101. This allows recovery of nanogram amounts of material. Multipass operation or repeated collection leads to preparative capillary GC for further spectroscopic investigation. These techniques do not involve sophisticated equipment or valves. Applications of this type of smell analysis, heart-cutting and enrichment in the analysis of Rhododendron fragrantissimum essential oil, black pepper essential oil and hop essential oil, illustrating the versatility of the systems, are presented.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240030302
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  • 9
    Electronic Resource
    Electronic Resource
    Evidence of absorption rate dependency of ibuprofen inversion in the ratPresented at the Eighth Annual Metting of the American Association of Pharmaceutical Scientists, November 14-18, 1993, Orlando, FL, USA. (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 6 (1994), S. 435-439 
    Details
    ISSN: 0899-0042
    Keywords: Ibuprofen ; nonsteroidal antiinflammatory drug (NSAID) ; chiral inversion ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ibuprofen (IB) is a chiral 2-arylpropionic acid derivative used as a nonsteroidal antiinflammatory drug (NSAID). It undergoes substantial R to S chiral inversion in humans and rats. In addition to systemic inversion, presystemic chiral inversion has been suggested for IB in humans but only after administration of formulations with slow absorption rates. In search for a suitable animal model, the absorption rate dependency of the extent of inversion was examined in male Sprague-Dawley rats given 20 mg/kg of racemic IB in aqueous solution (Tmax, 0.6 h), suspension (Tmax, 1 h) or as sustained release granules (Tmax, 2.3 h). In addition, (R)-IB (5 mg/liter) was incubated in the presence of everted rat gut segments in an organ bath at 37°. After sustained release granules, the S:R AUC ratios (7.3 ± 1.5) were significantly higher than suspension (3.6 ± 1.1) and solution (3.5 ± 0.2). Accordingly, AUCS and AUCR, as percent of the total AUC (S + R), significantly increased and decreased, respectively, after administration of the sustained released granules as compared with the solution and suspension. A significant positive linear correlation was found between the S:R AUC ratios and the corresponding Tmax for (R)-IB (r = 0.82). In vitro, (R)-IB was inverted by everted jejunum (12.2 ± 1.6%), ileum (14.2 ± 2.0%), and colon (4.4 ± 0.6%) segments. IB was also glucuronidated in the presence of the intestinal segments. Therefore, similar to earlier observations made in humans, in the rat, the S:R AUC ratio was positively and significantly correlated with the absorption rate from the dosage form. Rat small intestine was capable of inverting and conjugating (R)-IB. Hence, rat is a suitable model for studying the chiral inversion of IB. © 1994 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530060512
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  • 10
    Electronic Resource
    Electronic Resource
    Dual substrate limitations in upflow packed-bed biofilm reactors  -  a theoretical study (1997)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 20 (1997), S. 10-16 
    Details
    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 performance of an upflow packed-bed biofilm reactor has been analyzed under dual substrate limitation conditions. The numerical solution of the proposed equations defining the system has been obtained for a wide range of operating conditions for a case of practical significance involving glucose and oxygen as dual substrates. The results show that the inlet glucose concentration defines the limiting substrate at a position near the inlet of the reactor. For inlet glucose concentrations up to 300 mg/l, glucose acts as the limiting substrate. However, for inlet concentrations of 400 mg/l of glucose or higher, oxygen assumes the role of the limiting substrate at that position. For all other positions in the reactor, glucose acts as the limiting substrate, irrespective of its inlet concentration. Extensive computations were performed in order to define regions where glucose, oxygen or both are limiting. The predicted results have been found to be in agreement with the theoretical criteria, proposed in the literature, of determining the limiting substrate.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270200103
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