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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Aquatic Toxicology 28 (1994), S. 65-78 
    ISSN: 0166-445X
    Keywords: 4-Chloroaniline ; Bioconcentration ; Biotransformation ; Guppy ; Kinetics
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2072
    Keywords: Key words Cyamemazine ; Anxiety ; Serotonin ; 5-HT3-receptor ; 5-HT2C-receptor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Rationale: Cyamemazine is a neuroleptic compound which possesses anxiolytic properties in humans. On the other hand, 5-HT3- and 5-HT2C-receptors have been implicated in anxiety disorders and a previous binding study has shown that cyamemazine possesses high affinity for both serotonin receptor types. Objective: The present study was undertaken to establish whether cyamemazine antagonizes 5-HT3- and/or 5-HT2C-mediated responses, and whether it compares with reference compounds. Methods: Cyamemazine was tested for its ability to antagonize: (i) 5-HT3-dependent contraction of the isolated guinea-pig ileum and bradycardic responses in the rat and (ii) 5-HT2C-dependent phospholipase C (PLC) stimulation in rat brain membranes. Results: In isolated guinea-pig ileum, cyamemazine potently and competitively antagonized 5-HT-dependent contractions (pA2=7.52±0.08; n=5). In this test, cyamemazine was 5–7 times more potent (pIC50=6.75±0.13) than tropisetron (pIC50=6.02±0.04). In rats, cyamemazine i.v. antagonized 5-HT-dependent bradycardic responses with ID50%=3.2±1.5 mg/kg (n=4). Finally, in rat brain membranes cyamemazine antagonized 5-HT2C-dependent PLC stimulation with Ki=424 nM (mianserin exhibits a Ki=113 nM). Conclusions: Cyamemazine behaves as an antagonist at both 5-HT3- and 5-HT2C-receptors, which compares well with reference compounds. These 5-HT3- and 5-HT2C-antagonistic actions of cyamemazine can be involved, at least in part, in its beneficial therapeutic actions in anxiety disorders.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 37-41 
    ISSN: 0009-2940
    Keywords: Diphosphane, tetra-tert-butyl- ; Diselenide, bis(di-tert-butylselenophosphinyl) ; Phosphinic and phosphinous anhydrides ; Selenation ; Telluration ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Telluration and Selenation of Tetra-tert-butyldiphosphaneTetra-tert-butyldiphosphane (1) reacts with tellurium in boiling toluene to provide di-tert-butyltellurophosphinous anhydride (2) in high yield. Similarly, selenium inserts into the P—P bond of 1, but subsequently di-tert-butylselenophosphinous anhydride (3) adds another selenium atom with formation of a P=Se bond in tBu2PSeP(=Se)tBu2 (4). Pure 3 is obtained from di-tert-butylchlorophosphane and sodium selenide at 100°C. Oxidation of 3 provides the μ-selenophosphinic anhydride [tBu2P(=O)]2Se (7), which was characterized by an X-ray structure analysis. Reaction of 1 with three equivalents of selenium or reaction of 4 with one equivalent of selenium leads to mixtures that contain 4, [tBu2P(=Se)]2Se (5), and [tBu2P(=Se)]2Se2 (6). With excess of selenium, 6 was obtained in high yield. The course of telluration and selenation reactions and the structures of 2-7 were confirmed with help of 1H- and 31P-NMR and mass spectra.
    Notes: Tetra-tert-butyldiphosphan (1) wird durch Erhitzen mit elementarem Tellur in hoher Ausbeute in Di-tert-butyltellurophosphinigsäureanhydrid (2) übergeführt. Bei der Umsetzung von 1 mit Selen schließt sich der Selen-Einschiebung in die P—P-Bindung die Selenierung einer Phosphingruppe in Di-tert-butylselenophosphinigsäureanhydrid (3) zur Selenophosphinylfunktion in tBu2PSeP(=Se)tBu2 (4) an. Reines 3 erhält man durch Einwirkung von Di-tert-butylchlorphosphan auf Natriumselenid bei 100°C. Bei der Oxidation von 3 entsteht das μ-Selenophosphinsäureanhydrid-Derivat [tBu2P(=O)]2Se (7), dessen Struktur röntgenographisch bestimmt wurde. Umsetzung von 1 mit drei Äquivalenten Selen oder Umsetzung von 4 mit einem Äquivalent Selen in siedendem Ether führt zu Gemischen von 4, [tBu2P(=Se)]2Se (6). Verwendet man vier oder mehr Äquivalente Selen, so entsteht 6 in hoher Ausbeute. Reaktionsabläufe und die Konstitution der Verbindungen 2-7 werden insbesondere durch 1H- und 31P-NMR- und Massenspektren gesichert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Properties of Te—Te Bonds. IV. Dismutation Reactions of Di-p-tolylditelluride with Tetra-tert-butyldiphosphane and Tetra-isopropyldiphosphaneDi-p-tolylditelluride reacts with tetra-tert-butyldiphosphane and tetra-isopropyldiphosphane (prepared from the corresponding chlorophosphanes with potassium in toluene) with formation of new tellurophosphinous acid esters p-CH3C6H4TePR2 (R = t-C4H9, i-C3H7). Distillation leads to pure yellow liquids that have been characterized by 1H-, 13C-, 31P-, and 125Te-NMR, by elemental analysis and by mass spectroscopy.
    Notes: Di-p-tolylditellurid reagiert mit Tetra-tert-butyldiphosphan und Tetraisopropyldiphosphan, welche aus den entsprechenden Chlorphosphanen mit Kalium in Toluol hergestellt wurden, unter Dismutation zu den neuen Tellurophosphinigsäureestern p-CH3C6H4TePR2 (R = t-C4H9, i-C3H7). Die durch Destillation rein isolierten Verbindungen werden durch 1H-, 13C-, 31P- sowie 125Te-NMR-Spektren sowie durch EI-Massenspektren und Elementaranalysen charakterisiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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