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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on Diazo Compounds and Azides, L1). 7-Bromo-5-(diazomethyl)-5H-benzocycloheptatrienes - Syntheses by Electrophilic Diazoalkane Substitution and Transformation into 8-BromobenzocyclooctatetraenesThe benzotropylium bromide 4 undergoes electrophilic diazoalkane substitution with the silver (diazomethyl)phosphoryl compounds 5a-c in dichloromethane to give the 5-(diazomethyl)-5H-benzocycloheptatrienes 6a-c; formation of isomers (4→7) was not observed. Mercury-bis(diazomethylcarbonyl) compounds (8a-d) in benzene react analogously to the 5-(diazomethyl)-5H-benzocycloheptatrienes 9a-d. Copper(II)-acetylacetonate catalyzed decomposition of 6 and 9 in refluxing benzene leads to ring enlargement with exclusive formation of the benzocyclooctatetraenes 12a-f. There is no indication of the simultaneous generation of isomeric reaction products such as 13-16.
    Notes: Das Benzotropylium-bromid 4 geht mit den Silber-(diazomethyl)phosphorylverbindungen 5a-c in Dichlormethan elektrophile Diazoalkansubstitution zu den 5-(Diazomethyl)-5H-benzocycloheptatrienen 6a-c ein; Isomerenbildung (4→7) wurde nicht beobachtet. Quecksilber-bis(diazomethylcarbonyl)verbindungen (8a-d) in Benzol reagieren analog zu den 5-(Diazomethyl)-5H-benzocycloheptatrienen 9a-d. Die Kupfer(II)-acetylacetonat-katalysierte Zersetzung von 6 und 9 in siedendem Benzol führt unter Ringerweiterung ausschließlich zur Bildung der Benzocyclooctatetraene 12a-f. Es gibt keine Hinweise auf das gleichzeitige Entstehen isomerer Reaktionsprodukte wie 13-16.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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