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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 435-441 
    ISSN: 0170-2041
    Keywords: 1-Thiacyclooctyne ; Sulfur heterocycles ; Selenium heterocycles ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of 1-Thia-2-cyclooctyneStarting from 6-bromohexanoic acid (1) the title compound 14 is generated via the ketone 9 by application of the selenadiazole method. 14 possesses a strained and polarized triple bond provoking an unusually high reactivity. Besides the addition of water and ethanol leading to 9 and 29, respectively, the cycloaddition reactions with tetraphenylcyclopentadienone (14 → 16), with diazomethane (14 → 32, 33), and with carbon disulfide (14 → 35, 36) are discussed. 35 and 36 form the deep black complexes 37, 38 with TCNQ. The 1,4-diselenines 21, 22, the selenophenes 23-25, and the 1,3-diselenoles 27, 28 are obtained as sideproducts in the thermal selenadiazole fragmentation.
    Notes: Aus 6-Bromhexansäure (1) wird über das Keton 9 mit der Selenadiazol-Methode die Titelverbindung 14 hergestellt. 14 besitzt eine gespannte und polarisierte Dreifachbindung, was sich in einer ungewöhnlich hohen Reaktivität bemerkbar macht. Außer der Addition von Wasser und Ethanol zu 9 bzw. 29 werden die Cycloadditionen mit Tetraphenylcyclopentadienon zu 16, mit Diazomethan zu 32 und 33 und mit Schwefelkohlenstoff zu 35 und 36 besprochen. 35 und 36 bilden mit TCNQ die tiefschwarzen Komplexe 37, 38. Als Nebenprodukte werden bei der thermischen Selenadiazol-Fragmentierung die 1,4-Diselenine 21, 22, die Selenophene 23-25 und die 1,3-Diselenole 27, 28 erhalten.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 2035-2041 
    ISSN: 0009-2940
    Keywords: Alkynes ; Cycloalkynes ; Strain, steric ; Cycloaddition reactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The enthalpies of formation ΔHf and the ring strain energies Eg were calculated for the nine isomeric dithiacyclooctynes 1--9 by applying the MNDO method. Reaction Scheme 2 shows the synthesis of 1,4-dithia-2-cyclooctyne (1), which was the highest Eg value in this series. It dimerizes to 13 in the absence of reaction partners. Scheme 4 summarizes the preparation of 1,5-dithia-2-cyclooctyne (2) and its homologue 1,5-dithia-2-cyclononyne (23) and Scheme 6 the preparation of 1,4-dithia-6-cyclooctyne (6) and its homologue 1,5-dithia-7-cyclononyne (29). Depending on the position of the sulfur atoms, all three reaction sequences contain different steps for the introduction of the triple bonds.
    Additional Material: 2 Tab.
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  • 3
    Publication Date: 2013-02-01
    Print ISSN: 0018-019X
    Electronic ISSN: 1522-2675
    Topics: Chemistry and Pharmacology
    Published by Wiley
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