1975
DOI: 10.1002/cber.19751080528
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Darstellung von 2‐Alkyl‐2‐aryl‐1,3‐benzodioxan‐4‐onen durch Friedel‐Crafts‐Reaktion von O‐Acylsalicyloylchloriden mit Aromaten

Abstract: Die Friedel-Crafts-Reaktion von 0-Acylsalicyloylchloriden mit reaktiondahigen Aromaten und aromatischen Heterocyclen fuhrt unter dem katalytischen EinfluD von Zinn(IV)-chlorid zu 2-Alkyl-2-aryl-1,3-bcnzodioxan4onen (6). Durch Verfolgung der Reaktion mittels Protonenresonanzspektroskopie konnte das intermediar gebildete cyclische Acetoxonium-Ion 4 der Salicylsiiure nachgewiesen werden. Die Kinetik der Bildung dieses Ions aus 0-Acetylsalicyloylchlorid und Zinn(1V)-chlorid wurde auch in Abwesenheit eines nucleoph… Show more

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Cited by 3 publications
(1 citation statement)
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“…This is in accordance with a kinetic study [137] of the solvolysis of (39A) in aqueous dioxan. The formation of cyclic products was attributed [179] to the capability of O-acetylsalicylic acid chloride to form carbonium ion (40), confirmed by the isolation of the hexachloroantimonate (40, X = SbCI6) [180]. A similar behavior was also observed for a-acyloxycarboxylic acid chlorides [180,181].…”
Section: Acyl Chloridesmentioning
confidence: 70%
“…This is in accordance with a kinetic study [137] of the solvolysis of (39A) in aqueous dioxan. The formation of cyclic products was attributed [179] to the capability of O-acetylsalicylic acid chloride to form carbonium ion (40), confirmed by the isolation of the hexachloroantimonate (40, X = SbCI6) [180]. A similar behavior was also observed for a-acyloxycarboxylic acid chlorides [180,181].…”
Section: Acyl Chloridesmentioning
confidence: 70%