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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 755 (1972), S. 40-50 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dihalocarbenes from Trihalomethylcarbonyl CompoundsCleavage of chloral (1a), bromal (1b) or ω.ω.ω-trihaloacetophenones 1c-1g by dry alkali alcoholates affords alkyl formates or benzoates 2 and dihalocarbenes which are added to olefins giving dihalocyclopropanes 3-5. In the reactions of 1a and b with sodium methoxide the alcoholates 6a and b of the methyl hemiacetals are formed at first.
    Notes: Die Spaltung von Chloral (1a), Bromal (1b) oder ω.ω.ω-Trihalogen-acetophenonen 1c-1g mit trockenen Alkali-alkoholaten ergibt Ameisensäure- bzw. Benzoesäureester 2 und Dihalogencarbene, die an Olefine zu Dihalogencyclopropanen 3-5 addiert werden. Bei den Reaktionen von 1a und b mit Natrium-methylat werden zunächst die Alkoholate 6a und 6b der Methyl-halbacetale gebildet.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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