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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 3767-3773 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Allylidenephosphoranes, III. Novel Resonance-stabilized Phosphorus YlidesVia the simultaneous reaction of the α- and the γ-position, the allylidenephosphoranes 4 are converted by dicarboxylic acid dichlorides into five- and six-membered isocyclic phosphoranylidenediones 1, 2; by phenyl isothiocyanate into the dithioxo- or iminothioxophosphoranylidene-pyridines 8 and 9, 10, respectively. These systems are stabilized by charge delocalization. With monocarboxylic acid chlorides, acylation occurs at the α-position only, to yield the 2-phosphor-anylidene-3-buten-1-ones 5. Subsequent reductive removal of the phosphorane group of 5 leads to the β,γ-unsaturated ketones 6.
    Notes: Die Allylidenphosphorane 4 bilden durch α,γ-Reaktion mit Dicarbonsäuredichloriden fünf-und sechsgliedrige isocyclische Phosphoranylidendione 1, 2; mit Phenylisothiocyanat die Dithioxo- bzw. Iminothioxophosphoranylidenpyridine 8 bzw. 9, 10. Diese Systeme sind durch Ladungsdelokalisierung stabilisiert. Mit Monocarbonsäurechloriden erfolgt die Acylierung nur in der α-Stellung unter Bildung der 2-Phosphoranyliden-3-buten-1-one 5. Durch reduktiven Abbau der Phosphorangruppe werden diese in die β,γ-ungesättigten Ketone 6 übergeführt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2785-2789 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions with Allylidenephosphoranes, IV. An Easy Synthesis of Cyclopentadienones (Cyclones)The allylidenephosphoranes 2 react with α-ketocarbonyl chlorides 3 readily to afford the cyclopentadienones 4 and their Diels-Alder dimers 5. With an excess of 2a, 4a undergoes competitive Michael additions yielding a mixture of 4-allylidene-2-cyclopentenone 6 and 4-(1-propenyl)-2-cyclopentenone 7.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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