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  • 1
    Publication Date: 2015-11-11
    Description: Recent studies establish that cortical oscillations track naturalistic speech in a remarkably faithful way. Here, we test whether such neural activity, particularly low-frequency (
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 2
    Publication Date: 2000-09-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 2999-3003 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Based on first principles, a hypothesis was made on the potential correlation between entropy and degradation of machinery components in an earlier investigation of stochastic characterization of degradation dynamics. This paper reports on an experimental study in which degradation in the form of wear of model machinery component pairs was made on an accelerated testing basis. Concomitant measurement of entropy flow was made by means of a simple calorimeter. Results show a strong correlation between the referenced wear and the production of entropy flow. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 98 (1967), S. 852-873 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract The formation of benzotropolone compounds from catechol and pyrogallol derivatives depends upon the type, size, and position of the substituents in the reactants. Electrophilic substituents can be installed only in the 5-position of pyrogallol without loosing the capability of forming benzotropolones. This behavior is explained by the symmetrical electronic structure of the anion acting as 1.3-dipole. Pyrogallols, substituted in the 4- and 6-position by either methyl-, ethyl- or phenyl-groups, yield benzotropolones with 3-methoxy-o-benzoquinone. Isopropyl- andtert. butyl-groups in the same positions hinder benzotropolone formation because of steric hindrance. It was attempted to clarify the effect of the factors on the reaction mechanism by analysis of mixtures of benzotropolones, formed by oxidative coupling of catechol derivatives with pyrogallol-derivatives. On account of deficient yields this could not be done.
    Notes: Zusammenfassung Die Benzotropolonbildung aus Brenzcatechin- und Pyrogallolderivaten hängt von Art, Größe und Stellung der Substituenten in den Reaktionspartnern ab. Nur in die 5-Stellung des Pyrogallols können elektrophile Substituenten eingebaut werden, ohne daß die Fähigkeit zur Benzotropolonbildung verlorengeht. Dieses Verhalten wird durch die Symmetrie der elektronischen Struktur des als 1,3-Dipol wirkenden Anions erklärt. In 4- und 6-Stellung durch Methyl-, Äthyl- und Phenylgruppen substituierte Pyrogallole liefern mit 3-Methoxy-o-benzochinon Benzotropolone; Isopropyl- undtert. Butylgruppen in den gleichen Positionen verhindern aus sterischen Gründen die Benzotropolonbildung. Es wird versucht, aus der Produktanalyse von Benzotropolongemischen, die durch oxydative Verknüpfung von Brenzcatechinderivaten mit Pyrogallolderivaten hervorgegangen sind, Einblick in die den Mechanismus bestimmenden Faktoren zu erhalten. Verbindliche Aussagen hierüber werden durch die mangelhaften Stoffbildungen unmöglich gemacht.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 643-654 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid Crystal ThiazolesThe synthesis of 2,4- and 2,5-disubstituted thiazoles is described and their melting and clearing points are investigated. The influence of the thiazole ring system on the formation of crystalline-liquid phases is discussed.
    Additional Material: 5 Ill.
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  • 6
    ISSN: 0044-2313
    Keywords: Hydrostannation ; ethyl 3-(triorganostannyl)-N-acetylalaninates ; ethyl 3-(phenylhalogenostannyl)-N-acetylalaninates ; X-ray, IR, NMR data ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Reactivity of 3-Triorganostannylsubstituted Alanine Derivatives. Crystal Structure of Ethyl 3-(diphenylchlorostannyl)-N-acetyl alaninateC-Stannylated alanine derivatives of the type R3SnCH2—CH(NHCOMe) COOEt (1-4) are synthesized by hydrostannation of ethyl N-acetyl-α, β-dehydroalaninate with triorganotin hydrides or by reaction of potassium triphenylstannide with ethyl N-acetyl-3-chloroalaninate, respectively. The halogenation of 1 yields the halostannylsubstituted compounds Ph3 - nXnSnCH2CH(NHCOMe)COOEt 5-7 (n = 1, 2; X = Cl, Br). IR, NMR data and the determination of the crystal structure of Ph2Sn(Cl)CH2—CH(NHCOMe)COOEt (5) reveal for 5-7 an intramolecular coordination of the amide-CO group at the tin atom.
    Notes: C-stannylierte Alaninderivate des Typs R3SnCH2—CH(NHCOMe) COOEt (1-4) werden durch Hydrostannierung von N-Acetyl-α, β-dehydroalaninethylester mit Triorganozinnhydriden oder durch Umsetzung von Kalium-triphenylstannid mit N-Acetyl-3-chloroalaninethylester dargestellt. Die Halogenierung von 1 liefert die halogenostannylsubstituierten Verbindungen Ph3 - nXnSnCH2CH(NHCOMe)COOEt 5-7 (n = 1, 2; X = Cl, Br). IR-, NMR-Daten und die Bestimmung der Kristallstruktur von Ph2Sn(Cl)CH2—CH(NHCOMe)COOEt (5) beweisen für 5-7 eine intramolekulare Koordination der Amid-CO-Gruppe an das Zinnatom.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 63-71 
    ISSN: 0044-2313
    Keywords: diethyl triorganostannylmethyl N-acyl aminomalonates ; ethyl 3-(trimethylstannyl)-N-acyl alaninates ; 1,2-oxastannolane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: C-Stannylmethylated N-Acetyl- and N-Formyl-aminomalonic Acid DerivativesTin compounds of the type Me3SnCH2C(NHCOR) · (COOEt)2 (1: R = CH3; 2: R = H) are synthesized by reaction of acylaminomalonates with iodomethyl trimethylstannane. The halogenation of 1 and 2 yields the halostannylsubstituted compounds Me3-nXnSnCH2C(NHCOR)(COOEt)2 3-6 (R = Me, H; n = 1, 2; X = Cl, Br). The decarbethoxylation (KRAPCHO reaction) of 1 and 2 gives ethyl 3-(trimethylstannyl)-N-acyl alaninates (7 and 8). With one equivalent KOH 1 and 2 are transformed into the monoethyl malonates of the type Me3SnCH2C(NHCOR)(COOH)(COOEt) (9: R = CH3), which convert simultaneously under decarboxylation into 7 and 8 and by cyclisation under elimination of methane into the 1,2-oxastannolane derivatives 10 and 11. IR, NMR data and the determination of the crystal structure reveal for MeBr2SnCH2C(NHCOCH3)(COOEt)2 (5) hexacoordinated tin by intramolecular coordination of the amide-CO and one of the ester-CO groups.
    Notes: Zinnverbindungen des Typs Me3SnCH2C(NHCOR)(COOEt)2 (1: R = CH3; 2: R = H) werden durch Umsetzung von Acylaminomalonsäureestern mit Iodomethyltrimethylstannan dargestellt. Die Halogenierung von 1 und 2 liefert die halogenostannylsubstituierten Verbindungen Me3-nXnSnCH2C(NHCOR)(COOEt)2 3-6 (R = Me, H; n = 1, 2; X = Cl, Br). Die Decarbethoxylierung (KRAPCHO-Reaktion) von 1 und 2 führt zu 3-(Trimethylstannyl)-N-acyl-alaninethylestern (7 und 8). Mit einem Äquivalent KOH werden 1 und 2 in die Monoethylester des Typs Me3SnCH2C(NHCOR)(COOH)(COOEt) (9: R = CH3) überführt, die sich in Folgereaktionen sowohl unter Decarboxylierung zu 7 bzw. 8 als auch durch Cyclisierung unter Methanabspaltung zu den 1,2-Oxastannolanderivaten 10 bzw. 11 umwandeln. IR-, NMR-Daten und die Bestimmung der Kristallstruktur beweisen für MeBr2SnCH2C(NHCOCH3)(COOEt)2 (5) hexakoordiniertes Zinn durch intramolekulare Koordination der Amid-CO- sowie einer Ester-CO-Gruppe.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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