Abstract
Condensation of diazotizedo-nitroaniline with 3-ethylphenol or with 2-ethylphenol followed by reduction of the resulting azo compound with zinc dust in sodium hydroxide solution gave 2-(2-ethyl-4-hydroxyphenyl)2H-benzotriazole and 2(3-ethyl-4-hydroxyphenyl)2H-benzotriazole, respectively. The individual compounds were acetylated, brominated withN-bromosuccinimide to the corresponding 1-bromoethyl compounds which were then dehydrobrominated with triethyl amine in acetonitrile and hydrolyzed to 2(2-vinyl-4-hydroxyphenyl)2H-benzotriazole or 2(3-vinyl-4-hydroxyphenyl)2H-benzotriazole. The two monomers could be polymerized and copolymerized with styrene and methyl methacrylate. The ethyl as well as the vinyl compounds and the corresponding polymers, when tested, are ineffective as ultraviolet absorbers as they have structures of 4-hydroxyphenyl rather than 2-hydroxyphenyl compounds with respect to the benzotriazole ring. A careful NMR analysis for the correct structural assignment is also described.
Zusammenfassung
Diazotierteso-Nitroanilin wurde mit 3-Ethylphenol bzw. mit 2-Ethylphenol kondensiert. Reduktion der Diazoverbindung mit Zinkstaub in Natriumhydroxid ergab 2-(2-Ethyl-4-hydroylphenyl)2H-benzotriazol, bzw. 2-(3-Ethyl-4-hydroxyphenyl)2H-benzotriazol. Nach Acetylierung der freien Phenolgruppe wurden diese Verbindungen mitN-Bromsuccinimid zu den entsprechenden1-Bromethylverbindungen umgewandelt und daraufhin in Acetonitril mit Triethylamin dehydrobromiert. Darauf folgende Hydrolyse führte zu 2(2-Vinyl-4-hydroxyphenyl)2H-benzotriazol bzw. zu 2(3-Vinyl-4-hydroxyphenyl)2H-benzotriazol. Beide monomeren Verbindungen wurden sowohl homopolymerisiert als auch mit Styrol oder mit Methylmethacrylat copolymerisiert. Weder die Ethyl- noch die Vinylverbindungen oder deren Polymere erwiesen sich als UV-Stabilisatoren, eine Eigenschaft die den 2(2-Hydroxyphenyl)2H-Benzotriazolen eigen ist. Eine Methode der Strukturbestimmung mit Hilfe einer detaillierten NMR-Analyse wird ebenfalls beschrieben.
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This paper is dedicated to ProfessorGeorge Butler on the occasion of his 65th birthday, with best personal wishes.
Part XI:S. Yoshida andO. Vogl, Makromol. Chem., in press.
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Yoshida, S., Lillya, C.P. & Vogl, O. Functional polymers. XII: Synthesis and polymerization of 2(2-vinyl-4-hydroxyphenyl)2H-benzotriazole and 2(3-vinyl-4-hydroxyphenyl)2H-benzotriazole. Monatsh Chem 113, 603–622 (1982). https://doi.org/10.1007/BF00800267
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DOI: https://doi.org/10.1007/BF00800267