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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.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 1012-1022 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Syntheses with diazodiketones, VI. Cyclic S-OxidesThe S-oxides 4 of 3,4-dihydro-1,2,3-oxathiazines and 5 of 1,2-oxazetidines are prepared a) by thermolyzing diazodiketones 1 with N-Sulfinylamines 3; b) by condensing the 2-acylacetamides 6 which are readily accessible from 1, with thionyl chloride in the presence of a basic catalyst. From 6, the aminoacrylamides 7 are obtained. These react with thionyl chloride according to the base employed, to afford either the monocyclic 3,6-dihydro-1,2,6-thiadiazine-S-osides 10 or the 4-amino-quinolines 8, presumably via the intermediacy of an imine 9. - The introduction of the SO group into (hetero)cyclic iminocarboxamides, diamines or aminophenols give rise to the S-oxides 13 of condensed thiadieazines, 15a-c of benzothiadiazole, or 15d of benzoxathiazole, respectively.
    Notes: Die 3,4-Dihydro-1,2,3-oxathiazin- 4 und 1,2-Oxazetidin-S-oxide 5 werden a) durch Thermolyse der Diazodiketone 1 mit N-Sulfinylaminen 3 b) durch basenkatalysierte Kondensation der aus 1 leicht zugänglichen 2-Acylacetamide 6 mit Thionylchlorid hergestellt. Aus 6 weden die Aminoacrylamide 7 erhalten. Diese reagieren mit Thionylchlorid je nach der verwendeten Base entweder zu monocyclischen 3,6-Dihydro-1,2,6-thiadiazin-S-oxiden 10 oder über eine Imidoylketenimin Zwischenstufe 9 zu den 4-Aminochinolinen 8. - Der SO-Einbau mittels Thionylchlorid in (hetero)-cyclische Iminocarboxamide, Diamine und Aminophenole führt zu den S-oxiden 13 kondensierter Thiadiazine, 15a-c des Benzothiadiazols bzw. 15d des Benzoxathiazols.
    Additional Material: 1 Tab.
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 80-86 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Allylidenephosphoranes with Heterocumulenes, I. - VinylketeniminesAccording to their α-substituent the allylidenephosphoranes 4 are converted by isocyanates either via Wittig reaction into the hitherto little known vinylketenimines 7 or by carbamoylation and ring closure into the pyrrolone 5 or the 3-pyridylidenephosphoranes 9, a new stable ylide series. 7 reacts with electron deficient dienophils in a [4 + 2] cycloaddition to yield 10 or 11, respectively.
    Notes: Die Allylidenphosphorane 4 bilden mit Isocyanaten in Abhängigkeit des α-Substituenten entweder durch Wittig-Reaktion die wenig bekannten Vinylketenimine 7 oder durch Carbamoylierung und Ringschluß das Pyrrolon 5 bzw. die 3-Pyridylidenphosphorane 9, eine neue stabile Ylidreihe. 7 geht mit elektronenarmen Dienophilen [4 + 2]-Cycloaddition zu 10 bzw. 11 ein.
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