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  • 1
    Publication Date: 1974-01-01
    Print ISSN: 0040-4039
    Electronic ISSN: 1873-3581
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 88 (1955), S. 268-270 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Darstellung und Eigenschaften des Diphenylen-phenyl-jods werden beschrieben.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 561-592 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Aldehydes and Ketones with Chloro- and Fluorosulfonyl IsocyanateAt low temperatures, chloro- and fluorosulfonyl isocyanate (la or b) react with aldehydes at a molar ratio of 1:2, to give derivatives of dioxazinone 2, and with s-trioxane and 1,3,5,7- tetroxocane, to give tetraoxaazacyclodecanones 6. With ketones the reaction course depends upon their structure; in special cases it results in the formation of methyleneaminosulfohalides 9. Usually N-sulfohalides of F-keto carboxamides such as 11 are formed by substitution in the a-position. a,P-Unsaturated ketones yield oxazinones 13 by a (4 + 2)-cycloaddition reaction including participation of the C=C bond. - At low temperatures, the halosulfonyl isocyanates 1 a and b add to the oxygen of P-diketones forming 17, whereas at room tempera- ture they react at the z-carbon atom forming 18. In an analogous way, reaction with P-keto- carboxylic acid derivatives leads to formation of the isobutanetriones 28.
    Notes: Chlor- und Fluorsulfonylisocyanat (1 a bzw. b) reagieren bei tiefer Temperatur mit Aldehyden im Molverhältnis 1 :2 zu den Dioxazinonen 2, mit s-Trioxan und 1,3,5,7-Tetroxocan zum Tetraoxaazacyclodecanon 6. Die Reaktion mit Ketonen verläuft je nach deren Struktur verschiedenartig. In Sonderfällen entstehen Methylenaminosulfohalogenide wie 9. Meist bilden sich unter α-Substitution N-(Halogensulfonyl)-β-ketocarbonsäureamide wie 11. α,β-Ungesättigte Ketone liefern in einer (4 + 2)-Cycloaddition unter Einbeziehung der C =C- Bindung Oxazinone 13. - β-Diketone addieren die Halogensulfonylisocyanate 1 a und b bei tiefer Temperatur am Sauerstoff'zu 17, bei Raumtemperatur werden sie am α-Kohlenstoff zu 18 substituiert. Analog erhält man aus β-Ketocarbonsäuren die Isobutantrione 28.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 593 (1955), S. 127-156 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 28 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 722 (1969), S. 122-131 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Chlorosulfonyl Isocyanate with 1,3-DienesThe reaction of chlorosulfonyl isocyanate with 1,3-butadiene leads to a stable N-chlorosulfonyl-β-lactam 2 and, after hydrolysis, to 4-vinyl-2-azetidinone (3). On the other hand a number of alkyl-substituted 1,3-butadienes yield N-chlorosulfonyl-azetidinones, which are unstable in the presence of polar solvents and undergo rearrangement to 6-chlorosulfonyl-imino-δ3-dihydropyrans 7 as well as varying amounts of unsaturated N-chlorosulfonyl-δ-lactams 9 and/or unsaturated N-chlorosulfonyl carboxamides 8. Since the chlorosulfonyl group can be readily removed by hydrolysis, this reaction affords an easy route for the preparation of β-alkenyl-β-lactams and unsaturated δ-lactones.
    Notes: Die Umsetzung von N-Carbonyl-sulfamidsäurechlorid (1) mit Butadien-(1.3) führt zu einem stabilen β-Lactam-N-sulfochlorid 2 und nach der Verseifung zum 4-Vinyl-azetidinon-(2) (3). Im Gegensatz hierzu ergeben eine Reihe Alkyl-substituierter Butadiene-(1.3) umlagerungsfähige Azetidinon-N-sulfochloride, die in Gegenwart polarer Lösungsmittel instabil sind und eine Umlagerung zu 6-Chlorsulfonylimino-δ3-dihydropyranen 7 neben wechselnden Mengen ungesättigter δ-Lactam-N-sulfochloride 9 und/oder ungesättigter Carbonamid-N-sulfochloride 8 erfahren. Da die Sulfochlorid-Gruppe hydrolytisch leicht entfernt werden kann, eröffnet diese Reaktion einen präparativ einfachen Weg zu β-Alkenyl-β-lactamen und ungesättigten δ-Lactonen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 722 (1969), S. 110-121 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Chlorosulfonyl Isocyanate with OlefinsThe specific reaction rates k2 for the cycloaddition of activated sulfonyl isocyanates X-SO2-NCO (1, X = Cl, F) to olefins affording β-lactam derivatives are determined by infrared spectroscopy. The influences of the nature of the olefin, the substituent X and the polarity of the solvents on the rate of reaction are discussed. - The thermolabile N-chlorosulfonyl-azetidinones 9 and 13 synthesized from camphene and α-methylstyrene are described.
    Notes: Die Reaktionsgeschwindigkeitskonstanten k2 der Cycloaddition aktivierter Sulfonylisocyanate X-SO2-N=C=O (1, X = Cl, F) an Olefine zu β-Lactam-Verbindungen werden aus IR-Messungen ermittelt. Die Einflüsse des Olefin-Typs, des Substituenten X und der Lösungsmittelpolarität auf die Reaktionsgeschwindigkeit werden diskutiert. - Die thermisch empfindlichen Azetidinonsulfochloride 9 und 13 aus Camphen und α-Methylstyrol werden hergestellt.
    Additional Material: 13 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 539-560 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: β-Lactams Bearing Substituents Bonded via Hetero Atoms4-(Acyloxy)azetidin-2-ones are prepared by reaction of vinyl esters with chlorosulfonyl isocyanate. The nucleophilic displacement of the acyloxy group from C-4 occurs readily yielding 4-thio-, 4-(aryloxy)-, 4-(alkyloxy)-, 4-(arylsulfony1)-, 4-(alkylsulfonyl)-, 4-azido-, and 4-phthalimido-P-lactams. Under certain reaction conditions, the substituents bound to N, 0, or S in position 4 can readily be exchanged; this occurs with racemization.
    Notes: 4-(Acyloxy)azetidin-2-one sind aus Vinylestern und Chlorsulfonylisocyanat zugänglich. Die glatt ablaufende nucleophile Verdrängung der Acyloxygruppe am C-4 liefert 4-Thio-, 4- (Aryloxy)-, 4-(Alkyloxy); 4-(Arylsulfonyl)-, 4-(Alkylsulfonyl)-, 4-Azido- und 4-Phthalimido- P-lactame. Die über N,O oder S gebundenen Substituenten in 4-Stellung sind unter bestimmten Bedingungen erneut austauschbar. Dieser Austausch erfolgt unter Racemisierung.
    Additional Material: 11 Tab.
    Type of Medium: Electronic Resource
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