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  • Articles  (20)
  • Physical Chemistry  (16)
  • Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry  (4)
  • Wiley-Blackwell  (20)
  • 1
    Electronic Resource
    Electronic Resource
    Generation of vinyl cations by nitrosation of N-silylated imines and enaminesPresented as a poster at the 10th IUPAC Conference on Physical Organic Chemistry at Technion, Haifa, Israel, August 5-10, 1990. (1993)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 6 (1993), S. 44-46 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The reaction of monosilylated imines and a disilylated enamine with nitrosyl salts in dichloromethane at -78°C is shown to proceed via intermediate vinyl diazonium salts and vinyl cations.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610060107
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  • 2
    Electronic Resource
    Electronic Resource
    Structure of 1,2,6-thiadiazine 1,1-dioxides (1990)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 3 (1990), S. 470-476 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Ab initio theoretical calculations were carried out on the three tautomers, NH, OH and CH, of 1,2,6-thiadiazine 1,1-dioxides. Different basis sets were employed in order to obtain an adequate description of these cyclic sulphamide derivatives. A coherent picture is obtained which includes relative stability of tautomers (NH 〉 CH 〉 OH), non-planarity of NH and CH tautomers and electronic distribution (Boys' localized orbitals).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610030709
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  • 3
    Electronic Resource
    Electronic Resource
    The search for the ethynylcation: Nitrosation of N,N-bis(trimethylsilyl)ynamines (1995)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 8 (1995), S. 191-194 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The reaction of bis-silylated ynamines with different nitrosyl reagents affords products derived from an electrophilic attack at the β-carbon atom and not the expected alkynyldiazonium salts.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610080310
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of vitellogenin in the ant, camponotus festinatus: Changes in hemolymph proteins and fat body development in workers (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 17 (1991), S. 143-155 
    Details
    ISSN: 0739-4462
    Keywords: reproduction ; vitellin ; Hymenoptera ; caste ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Vitellogenin has been identified in the ant Camponotus festinatus, both in queens and workers. In the workers, it is already present before adult eclosion in low concentrations (〈1 μg/μl hemolymph). Vitellogenin and vitellin are immunologically identical and are composed of a single type of apoprotein with an apparent Mr = 185,000. The molecular weight of the native molecules was estimated as ∼460,000 by pore limiting gradient electrophoresis. Vitellogenin was detected as a major protein in the hemolymph of young workers, both under queenright and queenless conditions. Thus, in spite of their sterility in the presence of the queen, C. festinatus workers are able to synthetize vitellogenin which is identical both in size and immunologically to the queen vitellogenin. About 6-7 weeks after adult eclosion, however, vitellogenin was usually undetectable in the hemolymph of queenright workers, particularly the minor workers, while it constituted about 30% of total protein in queenless workers. Protein concentration in the hemolymph of queenless insects increased up to 20-fold as compared to 1-day-old insects. Queenless workers also developed large amounts of perivisceral fat body, while queenright workers, particularly the minor workers, showed a dramatic fat body regression about 6 weeks after emergence.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/arch.940170208
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  • 5
    Electronic Resource
    Electronic Resource
    Stimulation of sex pheromone production by head extract in Spodoptera littoralis at different times of the photoperiod (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 9 (1988), S. 211-220 
    Details
    ISSN: 0739-4462
    Keywords: pheromone biosynthesis-activating neuropeptide ; calling behavior ; Lepidoptera ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Adult females of Spodoptera littoralis (Lepidoptera: Noctuidae) showed a cyclic pattern of sex pheromone production, and high titers of (Z,E)-9,11-tetradecadienyl acetate, the major component of its pheromone blend, were only detected during scotophase. Maximal amounts of pheromone were extracted approximately 2 h into second scotophase. Decapitation before the beginning of darkness inhibited normal production of pheromone, and no calling behavior was observed. Injection of brain-suboesophageal ganglion (Br-SOG) homogenate at the onset of scotophase restored pheromone production in decapitated females to the levels characteristic of second scotophase. Pheromone biosynthesis was also stimulated in decapitated females during photophase. The response to Br-SOG homogenate injection was dose-dependent. The pheromonotropic activity of Br-SOG extract was the same when females were injected during photophase or scotophase.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/arch.940090305
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  • 6
    Electronic Resource
    Electronic Resource
    Occurrence of three different binding sites for Bacillus thuringiensis δ-endotoxins in the midgut brush border membrane of the potato tuber moth, phthorimaea operculella (zeller) (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 26 (1994), S. 315-327 
    Details
    ISSN: 0739-4462
    Keywords: Bacillus thuringiensis ; Phthorimaea operculella ; insecticidal crystal protein ; receptors ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The potato tuber moth is susceptible to at least three insecticidal crystal proteins (ICPs) from Bacillus thuringiensis: CrylA(b), CrylB, and CrylC. To design useful combinations of toxin genes either in transgenic plants or in new genetically modified B. thuringiensis strains, it is necessary to determine the binding characteristics of the different ICPs so as not to combine a pair sharing the same binding site. This has been accomplished using two different techniques: 125I-labeling of the ICPs with further measurement of the radioactivity bound to brush border membrane vesicles, and microscopic visualization of the bound ICPs by enzyme-linked reagents such as antibodies or streptavidin using biotinylated ICPs. Our results show that CrylA(b), CrylB, and CrylC bind to different sites in the brush border membrane of midgut epithelial cells. Also, the affinity of the binding sites for the ICPs and their concentration in brush border membrane vesicles has been determined in a laboratory strain and a storage collected population. No significant differences were found between these two strains. © 1994 Wiley-Liss, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/arch.940260407
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  • 7
    Electronic Resource
    Electronic Resource
    A systematic nomenclature for the “peroxyacyl nitrates,” the functional and structural misnomers for anhydride derivatives of nitrogen oxo acids (1980)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 12 (1980), S. 771-775 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550121011
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  • 8
    Electronic Resource
    Electronic Resource
    Gas-phase thermolysis of sulfur compounds. Part VIII. Chloromethyl allyl, cyanomethyl allyl, 1-cyanoethyl allyl and neopentyl allyl sulfides (1986)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 18 (1986), S. 355-362 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pyrolyses of four alkyl allyl sulfides with substituents on the α—C atom of the alkyl moiety have been studied in a stirred-flow system over the temperature range 340-400°C and pressures between 2 and 12 torr. The only products formed are propene and thioaldehydes. The reactions showed first-order kinetics with the rate coefficients following the Arrhenius equations: Chloromethyl allyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{{\rm - 1}}) = 10^{10.74 \pm 0.23} \exp ( - 144 \pm 3){\rm kJ/mol}RT $$\end{document} Cyanomethyl allyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{{\rm - 1}}) = 10^{10.20 \pm 0.19} \exp ( - 129 \pm 2){\rm kJ/mol}RT $$\end{document} 1-cyanoethyl allyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{{\rm - 1}}) = 10^{11.09 \pm 0.18} \exp ( - 141.5 \pm 2.2){\rm kJ/mol}RT $$\end{document} Neopentyl allyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{{\rm - 1}}) = 10^{10.54 \pm 0.24} \exp ( - 144 \pm 3){\rm kJ/mol}RT $$\end{document}The effects of these and other substituents on the reactivity is discussed in relation with the stabilization of a polar six-centered transition state. The results support a non-concerted mechanism where the 1-5 α—H atom shift is assisted by its acidic character.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550180308
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  • 9
    Electronic Resource
    Electronic Resource
    Gas phase thermolysis of benzyl t-butyl sulfide, phenyl t-butyl sulfide, and phenyl t-butyl ether (1989)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 21 (1989), S. 193-206 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pyrolysis kinetics of the title compounds has been studied in a stirred-flow reactor over the temperature range 440-530°C and pressures between 5 and 14 torr. Benzyl t-butyl sulfide and phenyl t-butyl ether formed isobutene as product in over 98% yield, together with the corresponding benzyl thiol and phenol. The benzyl thiol decomposes to a large extent into hydrogen sulfide and bibenzyl. In the pyrolysis of phenyl t-butyl sulfide, the hydrocarbon products consisted of 80 ±5% isobutene plus 20% isobutane, while the sulfur containing products were thiophenol and diphenyl disulfide. Order one kinetics was observed for the consumption of the reactants. The first order rate coefficients, based on isobutene production, followed the Arrhenius equations: Benzyl t-butyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$k(s^{ - 1}) = 10^{13.82 \pm 0.41} \exp ( - 214 \pm 6{\rm kJ/mol }RT)$$\end{document} Phenyl t-butyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$k(s^{ - 1}) = 10^{12.03 \pm 0.39} \exp ( - 188 \pm 6{\rm kJ/mol }RT)$$\end{document} Phenyl t-butyl ether: \documentclass{article}\pagestyle{empty}\begin{document}$$k(s^{ - 1}) = 10^{14.30 \pm 0.21} \exp ( - 211 \pm 3{\rm kJ/mol }RT)$$\end{document}For benzyl t-butyl sulfide and phenyl t-butyl ether, the results suggest a unimolecular mechanism involving polar four center cyclic transition states. For phenyl t-butyl sulfide, the t-butyl-sulfur single bond fission mechanism is a parallel, less important process than the complex fission one.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550210305
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  • 10
    Electronic Resource
    Electronic Resource
    Substituent effects in the gas-phase thermolysis of aryl tert-butyl ethers and sulfides (1990)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 22 (1990), S. 1127-1136 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pyrolyses of p-nitrophenyl t-butyl ether, p-methoxyphenyl t-butyl ether, p-aminophenyl t-butyl ether, p-nitrophenyl t-butyl sulfide, and propargyl t-butyl sulfide have been studied in a stirred-flow reactor over the temperature range 430-530°C and pressures in the range 7-14 torr, using toluene as carrier gas. The reactions yielded between 90 and 99% isobutene plus the corresponding phenol, thiophenol, or thiol as products. The first order rate coefficients for reactant consumption, based on isobutene production, followed the Arrhenius equationsp-nitrophenyl t-butyl ether\documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{ - 1}) = 10^{12.79 \pm 0.24} {\rm exp}(- 179 \pm 3{\rm kJ/mol}RT) $$\end{document} p-methoxyphenyl t-butyl ether \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{ - 1}) = 10^{14.50 \pm 0.30} {\rm exp}(- 210 \pm 4{\rm kJ/mol}RT) $$\end{document} p-aminophenyl t-butyl ether: \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{ - 1}) = 10^{14.59 \pm 0.28} {\rm exp}(- 208 \pm 4{\rm kJ/mol}RT) $$\end{document} p-nitrophenyl t-butyl sulfide \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{ - 1}) = 10^{12.12 \pm 0.27} {\rm exp}(- 185 \pm 4{\rm kJ/mol}RT) $$\end{document} propargyl t--butyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{ - 1}) = 10^{13.79 \pm 0.24} {\rm exp}(- 204 \pm 3{\rm kJ/mol}RT) $$\end{document}The results support a unimolecular elimination of the isobutene involving polar, four-center cyclic transition states.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550221103
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