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  • 1
    Electronic Resource
    Electronic Resource
    Unexpected Hydroxyspirolactone Formation upon Baeyer-Villiger Oxidation of a trans-α-decalone (trans-octahydronaphthalen-1(2H)-one) and X-ray structure of the product (1995)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 78 (1995), S. 887-890 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: trans-4,4,10-Trimethyl-9-decalone ( = trans-5,5,8a-trimethyl-octahydronaphthalen-1(2H)-one; 1), when treated with trifluoroperacetic acid, gave the unexpected hydroxyspirolactone 7-hydroxy-7,11,11-trimethyl-1-oxaspiro[5.5]undecan-2-one (6), in which the two new O-atoms were introduced in a 1,2-trans relationship. The structure of this compound was conclusively proven by X-ray crystallography. The process involves the intermediacy of 7-membered lactone 2, the expected Baeyer-Villiger product, which could also be successfully prepared under controlled conditions at 0° in a buffered medium containing Na2HPO4.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19950780411
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Dimethylol Urea as a Flame Retardant Formulation on Some Cellulosic Fabric Materials (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 20 (1996), S. 155-157 
    Details
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Samples of unscoured, scoured, bleached and mercerized cellulosic fabrics were treated with dimethylol urea (DMU). It was observed that this treatment imparted to the fabrics flame retardant (FR) characteristics. These observations were interpreted in terms of the fact that DMU reacts bifunctionally with glucopyronosyl hydroxyls in such a way that a three-dimensional (hence more stable) structure develops in addition to the possibility of release of acid residues within the flaming zone.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Ammonium Hydrogen Carbonate and Sodium Bromide on the Flammability of Hardboard (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 20 (1996), S. 297-299 
    Details
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The fire retardancy properties of hardboard treated with ammonium hydrogen carbonate (AHC) and sodium bromide were investigated by measuring their ignition time and flame temperature. An increase in ignition time and lowered flame temperature were observed with increased flame retardant (FR) concentration. AHC was found to be less effective as a fire retardant for this material. © 1996 by John Wiley & Sons, Ltd.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Note: Effect of some halogenated flame retardants on the thermal characteristcs of selected tropical construction materials (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 19 (1995), S. 191-195 
    Details
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effects of some halogenated flame retradants (FR), sodium bromide and ammonium cupric chloride dihydrate (ACCD) on the thermal behaviour of roofing palm (Borassus aethiopun) and rattan palm (calamus deeratus) were studied. Their ignition time, flame propagation rate and afterglow time were investigated. No ignition occurred on the materials treated with 0.4M ACCD and no ignition was observed on roofing palm treated with 0.8M sodium bromide. Flame propagation rate and afterglow time were drastically reduced. Gravimetric analysis showed that these retardants acted by vapour phase and condensed phase mechanisms. An increase in char formation was also noted as a result of this treatment in all cases.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fam.810190405
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of draw ratio on the structure of aromatic copolyimide fibers of random monomer sequence (1995)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 46 (1995), S. 261-266 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: X-ray methods have been used to investigate the structure of fibers of aromatic copolyimides prepared from 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), o-tolidine (OTOL) and p-phenylene diamine (PPD). We have shown previously that the non-periodic layer lines in the X-ray fiber diagrams of these copolymers are indicative of a random comonomer sequence. In the present paper, we analyze the shifts in the layer line positions that occur with increasing draw ratio. These changes are to be understood primarily in terms of increases in the correlation lengths for the stiff chain conformation. At high draw ratios there is also evidence for the development of a more extended chain conformation, probably due to torsional variation changes in the torsion angles. It is shown that the data are sufficiently sensitive to allow quantitative analysis of these separate effects, and their dependence on comonomer ratio.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1995.010460308
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  • 6
    Electronic Resource
    Electronic Resource
    Entwicklungen zur Abscheidung flüssiger Schlacketropfen aus heißen Rauchgasströmen unter Druck (1997)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 69 (1997), S. 1238-1239 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330690934
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Struktur und Konstitution von Dichloro(tetraalkylcyclobutadien)platin(II)-Komplexen (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1421-1425 
    Details
    ISSN: 0044-2313
    Keywords: Platinum complexes ; cyclobutadiene complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure and Constitution of Dichloro(tetraalkylcyclobutadiene)platinum(II) ComplexesHexachloroplatinic acid reacts in n-butanol with alkylsubstituted acetylenes RC≡CR (R = Me, Et) to give [PtCl2(C4R4)] (R = Me (1), R = Et (2)). The X-ray structure analysis of 1 (C2/m; a = 1 370.3(2), b = 1 128.3(1), c = 691.21(7) pm, β = 96.10(1)α; Z = 4) shows that 1 is monomeric and not dimeric as was described in the literature. Furthermore, 1 and 2 were extensively studied by i.r., Raman, and n.m.r. spectroscopical investigations.
    Notes: Hexachloroplatin(IV)-säure reagiert in n-Butanol mit alkylsubstituierten Acetylenen RC≡CR (R = Me, Et) zu Platincyclobutadien-Komplexen [PtCl2(C4R4)] (R = Me (1), R = Et (2)). Die Röntgeneinkristallstrukturanalyse von 1 (C2/m; a = 1 370,3(2), b = 1 128,3(1), c = 691,21(7) pm, β = 96 10(1)°; Z = 4) belegt, daß 1 monomer und nicht - wie bisher beschrieben - dimer aufgebaut ist. Desweiteren sind 1 und 2 umfassend durch IR-, Raman- und NMR-spektroskopische Untersuchungen charakterisiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210823
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  • 8
    Electronic Resource
    Electronic Resource
    Überprüfung von FE-Berechnungen für offene und geschlossene Zylinder unter Innen- und Außendruck durch Vergleich mit Berechnungen auf der Basis von analytischen Formeln (1995)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 26 (1995), S. 147-147 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19950260308
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  • 9
    Electronic Resource
    Electronic Resource
    Collisional activation spectra of organic ionsMetastable Ion Characteristics. XXII. Part XXI: D. J. McAdoo, F. W. McLafferty, and T. E. Parks, J. Amer. Chem. Soc., 94, 1601 (1972).A portion of this work was reported in a preliminary communication: F. W. McLafferty and H. D. R. Schuddemage, J. Amer. Chem. Soc., 91, 1866 (1969) (b) Further details are given in the Cornell University Ph.D. theses of R. K., 1971, and S.-C. T., 1972. (c) Postdoctoral Fellow, 1969-1970. (d) We are grateful to the National Institutes of Health (GM 16575 and 16609) and the Army Research Office (D31-124-G1117) for generous support of this work. (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 797-806 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Collision with neutral molecules is shown to provide a convenient method of adding internal energy to ions in a field-free drift region of the mass spectrometer. The effects on this process of ion accelerating potential, target gas pressure and identity, and precursor ion internal energy and mass have been investigated to optimize experimental conditions. Such collisions cause ion decompositions whose activation energies cover a broad range; for a particular ion such decompositions can be viewed as its “collisional activation (CA) spectrum.” CA spectra, which can be obtained for each ion in the normal mass spectrum, and which appear to follow the predictions of the quasi equilibrium theory, show many more of the possible unimolecular ion decomposition reactions for an ion than do unimolecular metastables, and thus provide valuable information for ion reaction mechanisms and molecular structure determination. Collisional activation can sometimes yield ion energies which are relatively inaccessible by electron impact. The precursor ion internal energy has a negligible effect on the ion's CA spectrum except for product ions formed through the processes of lowest activation energy. Thus, CA spectra should also be valuable for the characterization of ion structures.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190300604
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  • 10
    Electronic Resource
    Electronic Resource
    Ion source for electrohydrodynamic mass spectrometry (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 324-332 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Early in the development of electrohydrodynamic mass spectrometry (EH-MS), it was realized that ion source performance improved when the sample liquid was supplied discontinuously to the capillary emitter. Based on this realization, an ion source was designed that operates without an external sample supply system. Its essential part is a metal capillary that serves both as the liquid reservoir and the field anode and is mounted exchangeably on a pushrod. As the liquid flow is field induced, the flow rates are extremely low, in the range of 0.2 nl min-1. Thus, in spite of high analyte concentrations needed, sample consumption is only a few picomoles per mass scan. Moreover, the emission of larger droplets is avoided, which contributes to the stability of the ion signal. As the capillary emitter is mounted on a standard emitter carrier known from field desorption (FD) MS, the new ion source is compatible with conventional FD ion sources. EH mass spectra of analytes could be obtained from substances whose solubility in glycerol was〉0.5 mol l-1. The substances investigated with the new ion source include sugars, amino acids, peptides and an antibiotic. The general characteristics of the mass spectra are essentially the same as those known from other EH ion sources. Besides abundant solvent cluster ions, only cationated or protonated molecules of the analytes could be detected, frequently with one or more solvent molecules attached to the ions. Fragment ions were not observed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190300215
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