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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 3904-3907 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of Allylidenephosphoranes with Heterocumulenes, II. New Syntheses of 1,2,4-Pentatrienes and 2-Pentene-1,5-dionesCinnamylidenetriphenylphosphorane (2a) undergoes Wittig reaction with ketenes to afford monomeric and dimeric 1,2,4-pentatrienes 4 and 5, resp. 4b reacts further with an excess of ketene via a [2 + 2]-cycloaddition, whereby the 3-styryl-1-naphthyl diphenylacetate 12 is formed. In contrast, with the α-phenylsubstituted phosphorane 2b, instead of the Wittig reaction addition of ketene takes place at both the α- and the γ-positions. The 1,3-diacyl-3-triphenylphosphonio-1-propen-3-enolate 6 readily hydrolyzes to the 2-pentene-1,5-dione 9.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 938-943 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α-Ketodicarboxylic Acid Chloride Imide Chlorides in the Synthesis of Heterocycles, II: New Condensed and Spiro RingsThe 5-imino-2,4-pyrrolidinediones 3 and the 3-imino-2-aza-, 3-imino-2,8-diaza-, and 3-imino-2,5,8-triaza-1,4(2H,3H)-naphthalenediones 13 readily afford new condensed heterocyclic systems and heterocyclic spiro compounds via cyclocondensation, [4 + 2] cycloaddition, or 1,3-dipolar cycloaddition.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 183-187 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Syntheses with α-Acylketenimines and α-AcylketenesThe title compounds, which to a great extent are readily obtained from 2-diazo-1,3-diketones, are used as starting materials for new syntheses of polysubstituted pyrans, oxazines, oxathiins, thiazines, thioxopyrimidinones, pyrazoles, and thiolanes. These compounds are not yet described in the present substitution pattern.
    Notes: Die größtenteils aus 2-Diazo-1,3-diketonen leicht zugänglichen Titelverbindungen dienen als Ausgangsstoffe neuer Synthesen polysubstituierter Pyrane, Oxazine, Oxathiine, Thiazine, Thiopyrimidinone, Pyrazole und Thiolane. Diese sind in der vorliegenden Substitution noch nicht beschrieben.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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