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  • Articles: DFG German National Licenses  (2)
  • 1,1,2-Trifluoro-2-chloroethylene, bromination  (1)
  • 2(2-Hydroxyphenyl)2H-benzotriazoles  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 121 (1990), S. 31-43 
    ISSN: 1434-4475
    Keywords: Fluorochlorobromoacetic acid ; 1,1,2-Trifluoro-2-chloroethylene, bromination ; 1,2-Difluoro-1-chloro-2-methoxyethylene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Fluorchlorbromessigsäure wurde aus 1,1,2-Trifluor-2-chlorethylen in vier Stufen mit einer Gesamtausbeute von ca. 25% hergestellt. 1,1,2-Trifluor-2-chlorethylen wurde zuerst mit Natriummethoxid zu 1,2-Difluor-1-chlor-2-methoxyethylen umgesetzt, das dann mit elementarem Brom bromiert wurde. Das Reaktionsprodukt daraus ergab nach Behandlung mit konzentrierter Schwefelsäure Methyl-fluorchlorbromacetat, das nach Hydrolyse mit verdünnter Natronlauge zur Zielverbindung führte.
    Notes: Abstract Fluorochlorobromoacetic acid was sythesized in the sequence of four steps from 1,1,2-trifluoro-2-chloroethylene in an overall yield of approximately 25%. 1,1,2-Trifluoro-2-chloroethylene was first allowed to react with sodium methoxide to form 1,2-difluoro-1-chloro-2-methoxyethylene, which was then brominated with elemental bromine and the reaction product treated with concentrated sulfuric acid to give methyl fluorochlorobromoacetate. This compound was hydrolized with a diluted sodium hydroxide solution to fluorochlorobromoacetic acid.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-4475
    Keywords: 2(2-Hydroxyphenyl)2H-benzotriazoles ; Ultraviolet absorbers ; Condensation copolymers ; Polyamides ; Polyesters ; Polycarbonates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden Carboxy- und Carbomethoxy-Derivate von Resorcin mit zwei Benzotriazol-Substituenten dargestellt. 2(2,4-Dihydroxyphenyl)2H-1,3-bis-(4-carboxybenzotriazol) [2,4-Bis(2H-4′-carboxybenzotriazol-2-yl)-1,3-dihydroxybenzol] (DCBDH) wurde über Azokupplung von 4-Carboxy-2-nitrobenzol-diazoniumchlorid mit Resorcin, gefolgt von reduktiver Cyclisierung, synthetisiert. 2(2,4-Dihydroxyphenyl)2H-1,3-bis-(4-carbomethoxybenzotriazol) [2,4-Bis-(2H-4′-carbomethoxybenzotriazol-2-yl)-1,3-dihydroxybenzol] (DCMBDH) erhielt man mittels Veresterung der freien Dicarbonsäure mit Methanol. Die Verbindungen wurden mittels Elementaranalysen und spektroskopisch charakterisiert (IR, UV,1H und13C NMR). Es wurden Copolymerisationen zur Inkorporierung vonDCBDH undDCMBDH in Polyamide und Polyester durchgeführt. Die Kondensationskopolymeren werden kurz charakterisiert.
    Notes: Abstract Carboxy- and carbomethoxy derivatives of resorcinols with two benzotriazole substituents have been synthesized. 2(2,4-Dihydroxyphenyl)2H-1,3-bis-(4-carboxybenzotriazole) [2,4-bis(2H-4′-carboxybenzotriazole-2-yl)-1,3-dihydroxybenzene] (DCBDH) was prepared by azo coupling of 4-carboxy-2-nitrobenzene diazonium chloride with resorcinol followed by reductive cyclization. 2(2,4-Dihydroxyphenyl)2H-1,3-bis(4-carbomethoxy-benzotriazole) [2,4-bis-(2H-4′-carbomethoxy-benzotriazole-2-yl)-1,3-dihydroxybenzene] (DCMBDH) was obtained by esterification of the free dicarboxylic acid with methanol. The compounds were characterized by their elemental analyses and melting points, and by their IR, UV,1H NMR, and13C NMR spectra. Copolycondensations were carried out to incorporateDCBDH orDCMBDH into polyamides or polyesters. The condensation copolymers were briefly characterized.
    Type of Medium: Electronic Resource
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