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  • Chemistry  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 1563-1566 
    ISSN: 0947-3440
    Keywords: 1-Hydroxypyrazoles ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The oxidation of sodium pyrazolate with dibenzoyl peroxide is the first direct route to 1-hydroxypyrazole (2a). The reaction may be also applied to substituted pyrazoles.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Asymmetric Synthesis of Both Enantiomers of (E)-4,6-Dimethyl-6-octen-3-one- Defensive Substance of “Daddy Longlegs” Leiobunum vittatum and L. calcar (Opiliones)The acyclic enone (E)-4,6-dimethyl-6-octen-3-one (1) is the major component of the defensive secretion of “daddy longlegs” Leiobunum vittatum and L. calcar (Opiliones). Both antiomers [(S)-1 and (R)-1] as well as racemic 1 are conveniently synthesized from diethyl ketone 2 and the bromide 3 by employing the hydrazone method. It is shown by LIS-NMR technique that the acyclic ketone alkylation occurs with virtually complete asymmetric induction ≥ 97%).
    Notes: Das acyclische Enon (E)-4,6-Dimethyl-6-octen-3-on (1) ist die Hauptkomponente Abwehrsekrets der Weberknechte Leiobunum vittatum und L. calcar (Opiliones). Beide Enantiomere [(S)-1 und (R)-1] sowie racemisches 1 werden bequem aus Diethylketon 2 und dem Bromid 3 unter Verwendung der Hydrazon-Methode synthetisiert. Durch LIS-NMR-Technik gezeigt, daß die acyclische Ketonalkylierung mit praktisch vollständiger asymmetrische? On erfolgt (ee ≥ 97%).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 235-240 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Facile Synthesis of Ketene O,N-Acetals and Ketene O,O-Acetals by Tosylate EliminationReaction of the alcohols 4 and 5 with p -toluenesulfonyl chloride leads to the sulfonic esters 6 and 7, respectively, which on treatment with potassium tert-butylate easily react to give the ketene O,N-acetals 8 and O,O-acetals 9, respectively. The (E/Z) isomers 8 arising from the elimination reaction of 7 were identified by their 1H-NMR data after X-ray analysis of one of the isomers of 8e. On one example it is shown that the elimination reaction proceeds stereoselectively „anti“.
    Notes: Durch Reaktion der Alkohole 4 und 5 mit p-Toluolsulfonylchlorid erhält man die Sulfonsäureester 6 und 7, die mit Kalium-tert-butylat unter Eliminierung leicht zu den Keten-O,N-acetalen 8 bzw. -O,O-acetalen 9 reagieren. Die aus 6 entstehenden (E/Z)-Isomere 8 konnten nach Röntgenstrukturanalyse eines der Isomeren von 8e auch 1H-NMR-spektroskopisch identifiziert werden. An einem Beispiel wurde gezeigt, daß die Tosylat-Eliminierung stereoselektiv „anti“ abläuft.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0170-2041
    Keywords: Ketene O,N-acetals ; Antifungal agents ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Facile and Selective Synthesis of (Z)-tert-Butylketene O,N-AcetalsMelting the ketene O,O-acetals 1 with azoles in the presence of a catalytic amount of a proton acid yields the ketene O,N-acetals 2. The products of this phenol-azol substitution reaction are obtained as their (E/Z)-mixtures with the (Z)-isomers highly predominating. The (E)-isomers are easily converted into the (Z)-isomers by a proton acid catalysed isomerisation reaction.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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