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  • 1985-1989  (7)
  • 1970-1974
  • 1988  (7)
  • 1
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The absorption spectra of 2(2-hydroxyphenyl)2H-benzotriazoles derivatives substituted with electron-donating and withdrawing groups in various positions on the phenyl ring allowed to estimate the relative stability of the hydrogen-bonded structures as evidenced by the ɛ 340 nm/ɛ300 nm ratio. Photodegradation studies of poly-cis-1,4-butadiene-1,3 with and without 2(2-hydroxyphenyl) benzotriazole absorbers with various substituents show that compounds with R=H are better photostabilizers than those with R≠H.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Introduction of a second benzotriazole unit into 2(2-hydroxyphenyl)2H-benzotriazole structures causes a significant hyperchromic effect on the absorption spectra, the addition of a second hydrogen bonding hydroxyl group causes a small bathochromic shift, but a significant effect on the fluorescence spectrum.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The absorption spectra of 2 [2-hydroxy-5-(meth) acryloxyphenyl] 2H-benzotriazoles, their homoand copolymers were studied. The immediate environment (next monomer units in copolymers) determine the details of the spectral characteristics. Copolymers are more efficient in photostabilizing poly-cis-1, 4-butadiene-1, 3 in solution than the monomer or the homopolymer.
    Type of Medium: Electronic Resource
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  • 4
    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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  • 5
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polymerizable 2(2-hydroxyphenyl)2H-benzotriazole ultraviolet absorbers have the normal hydrogen bonded λ maximum at 340 nm. When more than one ortho-hydroxy group capable of hygen bonding is present in the molecule the extinction coefficient increases dramatically; the fluorescence spectra are also affected. It is expected that these compounds are very effective ultraviolet stabilizers.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 657-675 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A number of derivatives of ω-alkenoates were synthesized in preparation for the synthesis of functional polymers based on α-olefins. For the preparation of most of the methyl esters, the regular esterification of ω-alkenoic acids, specifically 10-undecenoic acid with methanol and sulfuric acid as the catalyst, was most effective. For the preparation of the tert-butyl- and 2-ethylhexyl esters of 10-undecenoic acid, the acid chloride route was found to be most convenient, whereas for the preparation of the corresponding esters of 5-hexenoic acid, our method of choice was the synthesis via the imidazolyl derivative of the acid. 2,2,2-Trifluoroethyl 10-undecenoate and the 2,2-dimethyloxazolidine derivative of 10-undecenoic acid were prepared from the acid and 2,2,2-trifluoroethanol or 2-amino-2-methyl-propanol with p-toluene sulfonic acid as the catalyst. Esters of phenol, 2,6-dimethylphenol, and 2,6-diphenylphenol were synthesized from 3-butenoic and 10-undecenoic acid with trifluoroacetic anhydride.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 677-700 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Esters of ω-alkenoic acids have been homopolymerized with transition metal initiating systems. The key to the successful polymerization was the complexation of the monomer prior to its addition to the initiating system. Titanium trichloride, aluminum activated, was found to be best as the transition metal part of the initiator systems, with diethyl-, or better, diisobutylaluminum chloride as the reducing agents and n-hexane or toluene as the solvents. Best results for polymerizations were obtained with 2,6-dimethylphenyl esters of the functional α-olefin monomers; however, other phenyl esters also polymerized well. Attempts to polymerize methyl 10-undecenoate gave the corresponding polymer in only low yields. Polymers of the 2,6-dimethylphenyl esters, obtained in high molecular weight, were characterized. Polymers were also obtained from 2,6-dimethylphenyl 7-octenoate, but not from ω-alkenoates with less than three methylene units between the ester group and the terminal olefin group.Poly(2,6-dimethylphenyl 10-undecenoate) was hydrolyzed in an aqueous sodium hydroxide/1,4-dioxane solution to poly(sodium 10-undecenoate) that in turn was neutralized with acetic acid to poly(10-undecenoic acid).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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