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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 22 (1971), S. 309-311 
    ISSN: 0947-5117
    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
    Description / Table of Contents: Pitting corrosion under hydrogen bubbles, adherent to the surface of zincInvestigation zinc alloys in acid solutions, it could be determined that under hydrogen bubbles which has adhered on the surface, annuker pitting corrosion took place. The types of corrosion attack were examined under a microscope during and after the corrosion test and in some cases under scanning electron microscope. The formation of the annular pittings can be interpreted as an impoverishment of hydrogen ions in the boundary layer between the hydrogen bubble and the surface of the specimen.
    Notes: Bei Korrosionsuntersuchungen an Zinklegierungen im sauren Korrosionsmedium konnte festgestellt werden, daß an Stellen anhaftender Wasserstoffblasen auf der Probenoberfläche ringförmiger Lochfraß entsteht. Diese Korrosionserscheinungen wurden während und nach dem Korrosionsversuch mit dem Lichtmikroskop und dem Rasterelektronenmikroskop untersucht. Das Entstehen dieser ringförmigen Lochfraßnarben kann durch die Verarmung von Wasserstoffionen in der Grenzschicht zwischen Wasserstoffblase und Probenoberfläche erklärt werden.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 190 (1930), S. 270-276 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Neben den1 Chlor-1-fluorid besteht auch ein Chlor-3-fluorid, welches durch Erhitzen von CI2 oder CIF mit überschüssigem F2 dar- gestellt wird. Die umkehrbare Reaktion CIF + F2 ⇆ CIF3 führt zu einem Gleichgewicht, in dem bei 250° Zahl der CIF-Moleküle ein Mehrfaches der CIF3-Moleküle ist. Die Zusammensetzung des neuen Fluorids is durch Analysen und Dichtebestimmungen sichergestellt. Seine physikalischen und chemischen Eigenschaften werden mit - geteilt.Besonders bemerkenswert ist die Lebhaftigkeit und die Mannigfaltigkeit der Reaktionen des CIF3.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0899-0042
    Keywords: chromatographic resolution of stereoisomers ; molecular modelling ; conformation ; κ-opiate receptor ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The four stereoisomers of the two peripherally selective κ-opioid agonists EMD 60 400 and EMD 61 753 were synthesized, tested for stereoisomeric purity, and examined for affinity to the κ opioid receptor. The relationships between the configuration of these molecules and their biological activity are discussed. © 1994 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 291-300 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Directed Synthesis of Sulfinato-O and -S Complex of Transition Metals, XI. Linkage Isomerism in Sulfinato Complexes of Zinc(II)Starting from the sulfinato-O, O′ complexes (RSO2)2Zn(OH2)2(1a, b) the mono-, bis-, and tris(2, 2′-bipyridyl) complexes 2a, b, 3a, b, and 4a, b are produced according to equation (1) by stepwise addition of 2, 2′-bipyridyl. In the case of the bis(2, 2′-bipyridyl) complexes 3a, b the linkage-isomeric sulfinato-O and -S complexes 3aO, 3bO, and 3aS, 3bS are obtained. From 4a, b 1 mole of 2, 2′-bipyridyl can be eliminated reversibly with acetone according to equation (7) with formation of 3aO and 3aO. The newly prepared compounds were characterized on the basis of their i. r. spectra. In the case of 4a, b DTA, TG, and DTG measurements were carried out.
    Notes: Gemäß Gl. (1) gelingt, ausgehend von den Sulfinato-O, O′-Komplexen (RSO2)2zn(OH2)2 (1a, b), die schrittweise Addition von 2,2′-Bipyridyl, wobei die Mono-, Bis-und Tris(2,2′-bipyridyl)-Komplexe 2a, b, 3a, b und 4a, b entstehen. Im Falle der Bis(2,2′-bipyridyl)-Komplexe 3a, b wurden die bindungsisomeren Sulfinato-O-und-S-Komplexe 3aO, 3bO und 3aS, 3bs erhalten. Aus 4a, b läβt sich mit Aceton reversibel ein mol 2, 2′-Bipyridyl gemäß Gl. (7) unter Bildung von 3aO und 3bO abspalten /die neu dargestellten Verbindungen werden IR-spektroskopisch charakterisiert. Im Falle von 4a, b sind DTA-, TG- und DTG-Messungen durchgeführt worden.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 370-380 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Boron Complexes of Malonamides and MalonamidinesN,N,N′,N′-Tetramethylmalonamide (4) reacts with triethyloxonium tetrafluoroborate in boiling tetrachloroethane or with diethyl ether  -  boron trifluoride at room temperature to form the tetrafluoroborate 6a which was deprotonated with triethylamine to give 4,6-bis(dimethylamino)-2,2-difluoro-3-oxa-1-oxonia-2-borata-4,6-cyclohexadiene (7). With 4 and boron trichloride in CCl4 the neutral complex 9 is obtained, in CH2Cl2 the chelate complex 10. Similar to diethyl ether  -  boron trifluoride (2-aminoethoxy)diphenylborane (12) and triethylborane (15) condense with 4 to yield the salts 13 and 17, respectively, and the neutral complexes 14 and 16, respectively. N,N,N″,N″- Tetramethylmalonamidine (20) reacts with triethylborane (21a), ethoxydiphenylborane (21b) and trimethoxyborane (21c) to give the neutral complexes 22a-c which partly can be protonated with HBF4 to form the salts 23a, b.
    Notes: N,N,N′,N′-Tetramethylmalonsäurediamid (4) bildet mit Triethyloxonium-tetrafluoroborat in siedendem Tetrachlorethan oder mit Diethylether  -  Bortrifluorid bei Raumtemperatur das Tetrafluoroborat 6a, das sich mit Triethylamin zum 4,6-Bis(dimethylamino)-2,2-difluor-3-oxa-1-oxonia-2-borata-4,6-cyclohexadien (7) deprotonieren läßt. Bortrichlorid liefert mit 4 in CCl4 den Neutralkomplex 9, in CH2Cl2 den Chelatkomplex 10. Ähnlich wie Diethylether  -  Bortrifluorid kondensieren auch (2-Aminoethoxy)diphenylboran (12) und Triethylboran (15) mit 4 zu den Salzen 13 bzw. 17 und zu den Neutralkomplexen 14 bzw. 16. N,N,N″N″-Tetramethylmalonamidin (20) bildet mit Triethylboran (21a), Ethoxydiphenylboran (21b) und Trimethoxyboran (21c) die Neutralkomplexe 22a-c, die sich mit HBF4 teilweise zu den Salzen 23a,b protonieren lassen.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0268-2605
    Keywords: Organolead ; organomercury ; organotin ; toxicity ; lipid metabolism ; arachidonic acid ; Lands cycle ; cell culture ; HL-60 cells ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The concentration of free fatty acids within cells is mainly dependent upon the following enzyme activities: liberation by phospholipase A2 (PLA2), activation of free acids by acyl-CoA-synthetase and re-esterification by lysophospholipid acyltransferase (LAT). In many cell types, especially those of the haematopeotic system, this deacylation-reacylation cycle (‘Lands cycle’) plays an important role in the regulation of free fatty acid concentration, above all that of arachidonic acid.We have shown here that heavy-metal compounds affect this cycle mainly at two points and thereby lead to an increase of free fatty acids. On the one hand, organometals cause an inhibition of the reacylation of lysophospholipids; and on the other, the induction of PLA2 activity produces the same result. All compounds investigated such as methylmercury chloride (MeHgCl), diethyltriethyl-, and trimethyl-lead chloride (Et2PbCl2, Et3PbCl, Me3PbCl) as well as trimethyltin chloride (Et3SnCl) and di-t-butyltin dichloride (t-Bu2SnCl2) show at least one of these effects. In the case of Et3PbCl, the use of PLA2-inhibitors or pertussis toxin causes a drastic decrease in the amount of arachidonic acid liberated. These experiments demonstrate that the organometallic compounds inhibit the reacylation and/or stimulate the deacylation of fatty acids that are involved in many important biological or pathological mechanisms. The results suggest that in differentiated HL-60 cells the organometal compounds stimulate the Lands cycle by increasing the activity of the PLA2, possibly via a signal-transduction mechanism, and this effect is intensified via an inhibition of reesterification.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 71 (1999), S. 1029-1029 
    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
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 794-794 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 69 (1997), S. 1287-1288 
    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
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 70 (1998), S. 711-713 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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