Synthese und Charakterisierung von Epoxidharzen aus Bisphenol A,Cyanursäuure und Epichlorhydrin

Epoxy resins of Bisphenol A, cyanuric acid, and their mixtures were synthetized with epichlorohydrin. The obtained products were characterized by gel permeation chromatography, FT-IR-spectroscopy, ¹H-NMR-, ¹³C-NMR-spectroscopy and DSC-analysis. During the syntheses besides the glycidyl-derivatives of Bisphenol A and cyanuric acid also biuret-derivatives were formed as a result of cracking the isocyanurate-ring. The formed resins of Bisphenol A-cyanuric acid mixtures can be crosslinked by heat without additional curing agents.     

Ultraschall-induzierte Synthese von Trlmethylsilylessigsäuresilylestern

Ultrasound-induced Synthesis of Trimethylsilylacetic Acid Trimethylsilylester . The reaction of bromoacetic acid trimethylsilylester with zinc in presence of chlorotrimethylsilane is promoted by sono-waves. The trimethylsilylacetic acid trimethylsilylester could be obtained in high yield. Different products are observed in presence of dichloro dimethylsilane. Mechanical aspects are discussed.     

Gezielte Synthese von Dimerfettsäuren

Selective Synthesis of Dimer Fatty Acids Dimer fatty acids are aliphatic C₃₆-dicarboxylic acids, and are important raw materials for the manufacture of polyamides, polyesters, heavy duty lubrication oils and plasticizers. They are made by condensation of two unsaturated fatty acids in the presence of a catalyst. Because of the complicated reaction mechanism a complex mixture is obtained. Therefore only insufficient information in regard to the structure has been obtained. We report the synthesis of single isomers of linear and branched C₃₆-dicarboxylic acids. Characteristic spectroscopic and GC-data of the structural types are reported.     

Elektrocyclische Synthese von aromatischen Aldehyden aus kettenförmigen Polymethinfarbstoffen

Electrocyclic Synthesis of Aromatic Aldehydes from Chain-shaped Polymethine Dyes Chain-shaped heptamethines form benzaldehyde by an electrocyclic reaction whereas nonamethines give cinnamic aldehyde. The Eyring parameters and the yields of the reaction are determined in dependence on the concentration of hydrogen ions.     

Synthese von 4-Arylazo-isoxazoliumsalzen

Synthesis of 4-Arylazo-isoxazolium Salts 4-Arylazo-isoxazolium salts ( 3, 4 ), a new class of cationic dyes, are now available by alkylating the isoxazoles 5 and by reacting 1,3-dicarbonyl compounds of the type 1 with N-alkyl-hydroxylamines, respectively. In contrast to the isothiazole system the alkylation of isoxazoles 5 at the ring nitrogen atom does not cause a significant bathochromic shift. 4-Arylazo-5-methoxy-isoxazolium salts ( 8 ) can be prepared by alkylating 4-arylazo-isoxazolin-5-ones ( 6 or 11 ) with dimethyl sulfate. The analogous reaction with 4-arylazo-5-alkylthio-isoxazolines ( 12, 13 ) failed, however, the expected 4-arylazo-5-alkylthio-isoxazolium salts (e. g. 14 ) can be obtained from 12 and trialkyloxonium fluoborate.     

Beiträge zur Synthese von Orthocarbonsäureamiden

The formamidinium salts 11a, c as well as the nitrile 12 react with sodiumhydride/dimethylamine in the presence of trimethylborate to give the ortho formic acid amide 3a . The orthoamides 6a and 16 can be prepared from the iminium salts 15 and 14 , resp. by the same procedure. Treatment of the azavinylogous formamidinium salt 15 with sodiumhydride and piperidine or morpholine in the presence of trime‐thylborate affords the orthoamides 6c and 6d , resp. By transamination of the azavinylogous aminalester 5a are accessible the orthoamides 6b—d . The vinylogous orthocarbonic acid derivative 17 can be obtained from the salt 14 and sodium alcoholates. The action of sodiumhydride, dimethylamine and trimethylborate on the iminium salt 18 produces a mixture of the orthocarbonic acid derivatives 7a, 8a, 9a . When the guanidinium salt 20 is treated with the same reagents the ortho‐amides 3a and 10a are obtained. The reduction of the salt 20 with sodiumhydride in the presence of several activating reagents (e.g. tetrabutyl orthotitanate, aluminiumisopropylate, trimethylborate) affords the orthoamide 3a . The reduction of the iminium salts 18 and 24 does not proceed clean, giving mixtures of various orthoformic acid derivatives. The form‐amidine 25 can be prepared by reduction of the salt 15 with sodiumhydride/trimethylborate with good yields. By the action of the corresponding carbanions on the guanidinium salt 20 can be obtained the carboxylic acid orthoamides 26—33 . By the same procedure the orthoamides of alkyne carboxylic acids 36a—h, j—n are accessible.     

Synthese von N-Maleoyl-aminosäuren und -peptiden

Synthesis of N-Maleoyl-aminoacids and -peptides N-Maleoyl-aminoacid-N′-hydroxysuccinimidesters 3 or N-maleoyl-aminobenzoic acids 5 are synthesized from N-maleyl-aminoacids 1 on different ways. N-maleoyl-aminobenzoic-4-nitro-phenyl-,-2-nitro-phenyl-or 2,4-dinitro-phenylesters 6 , 7 and 8 will be obtained from 1 or 5 . o-Mercapto-aniline, thiourea or cysteine react with 5 to benzothiazines 9 , thiazolidines 10 and 1,4-thiazines 11 . from 5 the peptides 12 are yielded. The pentapeptide 13 are formed from 12 by addition of glutathione.     

Mischpolymer-Latices aus Vinylacetat-Vinylestern von aus Tetrapropylen Hergestellten Carbonsäuren

Copolymer Latices Based on Vinyl Acetate and Vinyl Esters of Carboxylic Acids Derived from Propylene Tetramer Vinyl esters of carboxylic acids prepared from propylene tetramer were obtained by interesterification with vinyl acetate and the parameters for the copolymerization with vinyl acetate were determined. The properties of latices and coating films were evaluated with reference to the composition of the copolymer. Compared to other types of latices, coating films based on the above copolymers exhibit good properties. Especially, the resistance towards diluted alkali is excellent.