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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 956-964 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: SelenoimidatesThe new selenoimidates 3a-f were prepared and compared with imidates and thioimidates concerning their E/Z isomerism and barriers to isomerization.
    Notes: Die neuen Selenoimidsäureester 3a-f wurden dargestellt und hinsichtlich ihrer E/z-Isomerie und Isomerisierungsbarrieren mit Imidsäure- und Thioimidsäureestern verglichen.
    Additional Material: 2 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 661-672 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloaddition Reactions of Heterocumulenes, XI: Reactions of Monomeric and Dimeric tert-Butylcyanoketene with AzomethinesOf the possible 2:1 adducts 4-7 of the ketene 1 and the azomethines 2a-d the 1,3-oxazinones 4 are obtained, whereas the dimeric ketene 15 reacts to give compounds of the type 5 or 6 (19). The cyclic azomethine 12 reacts with 1 to yield the 2:1 adduct 13. β-Lactames 9 can be obtained by pyrolysis of 4 (9a), addition of 1 to 2d (9b), or starting from the sterically hindered imine 2e (9c). The stereochemistry of the cycloadducts is discussed.
    Notes: Von den möglichen 2:1-Addukten 4-7 aus dem Keten 1 und den Azomethinen 2a-d werden die 1,3-Oxazinone 4 erhalten, während das dimere Keten 15 zu Verbindungen des Typs 5 oder 6 (19) reagiert. Das cyclische Azomethin 12 gibt mit 1 das 2:1-Addukt 13. β-Lactame 9 sind durch Pyrolyse von 4 (9a), Zugabe von 1 zu 2d (9b) oder aus dem sterisch gehinderten Imin 2e (9c) zugänglich. Die Stereochemie der Cycloaddukte wird diskutiert.
    Additional Material: 1 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 334-340 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloaddition Reactions of Heterocumulenes, XVIII.  -  Reactions of tert-Butylcyanoketene with Cyclic ThioimidatesThe reactions of the ketene 1 with the thiazine 2b and the 2-phenyl substituted heterocycles 2c or d lead to the [1:1]-cycloadducts 4 with the penam or cepham framework, respectively. All the products have the same configuration 4A. The reaction with the thiazolines 2a and 7 gives no β-lactams but, instead, the [2:1]-cycloadducts 5, 8 and the [1:2]-cycloadducts 6, 9 in yields depending upon the reaction conditions.
    Notes: Die Reaktion des Ketens 1 mit dem Thiazin 2b und den 2-Phenyl-substituierten Heterocyclen 2c oder d führt zu [1:1]-Cycloaddukten 4 mit dem Penam- bzw. Cepham-Gerüst. Die Produkte liegen stereochemisch einheitlich in der Konfiguration 4A vor. Aus der Umsetzung mit den Thiazolinen 2a und 7 werden keine β-Lactame, sondern in Abhängigkeit von den Reaktionsbedingungen die [2:1]-Cycloaddukte 5, 8 und die [1:2]-Cycloaddukte 6, 9 isoliert.
    Additional Material: 2 Tab.
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  • 4
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thioketene Syntheses, IV1). - Thioketenes from 5-Alkyl- or 5-Heterosubstituted 1,2,3-Thiadiazoles; Indications for the Participation of ThiirenesThe flash thermolysis of the thiadiazoles 3a-i yields the thioketenes 7a-f which can be characterized spectroscopically. However, the cyanothioketenes 7g, h can only be detected by the trapping reaction to give the thioamides 8. Irregularities in the migratory aptitudes of R2 in the Wolfftype rearrangement of the primary fragments 4 indicate that thiirenes 5 participate in the formation of the thioketenes 7.
    Notes: Die Blitzthermolyse der Thiadiazole 3a-i führt zu den Thioketenen 7a-f, die sich spektroskopisch charakterisieren lassen. Die Cyanthioketene 7g, h lassen sich dagegen nur durch die Abfangreaktion zu den Thioamiden 8 nachweisen. Unregelmäßigkeiten in der Wanderungstendenz von R2 in der Wolff-analogen Umlagerung der Primärfragmente 4 deuten auf die Beteiligung von Thiirenen 5 an der Thioketenbildung.
    Additional Material: 1 Ill.
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