Synthese und Charakterisierung von Polychlorisobutenen

Synthesis and Characterization of Polychlorinated Isobutenes The preparation of polychlorinated methallylic chlorides by continuous chlorination of isobutene with different ratios of chlorine and following HCl-elimination is described. The structure is proved by reaction of the polychlorinated isobutenes with sodium thiolacetate and potassium thiocyanate and by spectroscopic methods.     

Synthese und spektrale Charakterisierung von blauen Benzenazofarbstoffen

Synthesis and Spectral Characterization of Blue Azo Dyes of the Benzene Series 53 Donor-acceptor substituted azo dyes of the benzene series were prepared by diazonium-coupling reactions ( 1 a–s ) or halogen-cyanide exchange (→ 2 a–x, 3 a–j ). Described are the preparation of the amines 4 a–m and the coupling compounds 5 a–t and the procedure of diazotizing and coupling. The colouristic and spectroscopic data show that compounds of the general formula 1 are excellent brilliant blue azo dyes useful for dyeing polyester material.     

Synthese und Charakterisierung von Poly(dimethylsilylen-co-phenylmethylidenen)

Synthesis and Characterization of Poly(dimethylsilylene-co-phenylmethylidenes) The synthesis of a series different poly(dimethylsilylene-co-phenylmethylidenes) D-PMBz was afforded by the reaction of α,α-dichlorotoluene and dimethyldichlorosilane with sodium as reductive agent at molar ratios Me₂SiCl₂:Cl₂CHPh = 9; 4; 2,3; 1,5; 1; 0,7; (D-PMBz 1-6 ) respectively. The reduced reactivity of the carbosilane bridge builder α,α-dichlorotoluene and dimethyldichlorosilane led to a variety of side reactions like parasilylation of phenyl groups and the insertion of the solvent xylene. The synthesized D-PMBz, obtained in solid unsoluble and viscous soluble fractions, were investigated by IR-, ¹H-, ¹³C- and ²⁹Si-NMR-spectroscopy. Furthermore the average molecular weights were measured by gelpermeation chromatography. The thermolysis to 1130°C gave the ceramic residues of the soluble poly(dimethylsilylene-co-phenylmethylidenes).     

Synthese und Charakterisierung von Stilbazoliumfarbstoffen mit mesoionischer 1,2-Diaziniumstruktur

Synthesis and Characterization of Stilbazolium Dyes with Mesoionic 1,2-Diazinium Structure Pyridazinium salts of typ 1 react with substituted aromatic and heteroaromatic aldehydes 2a , e–h , 8a–c and trans-p-dimethylamino-cinnamaldehyde 3a to the charge transfer dyes 4a–h , 5a–d , 9a–c . They absorb in the range between 380 and 660°nm. The dehydratisation of the aldoxime group in 4, 5 to the nitril group under formation of 6 , 7a–d causes a bathochromic shift of the absorption band up to 110 nm. The UV-VIS data are discussed dependent on the structure of the dyes.     

Synthese und Charakterisierung von Bisphenyl- und Biscyclohexyl-4,4′-bibenzyldicarboxylaten

Syntheses and Characterisation of Bisphenyl- and Biscyclohexyl-4,4′-bibenzyldicarboxylates A one pot syntheses gives bisphenyl-4,4′-bibenzyldicarboxylates ( 2 ) or biscyclohexyl-4,4′-bibenzyldicarboxylates ( 3 ) from bibenzyl ( 4 ) and phenols ( 5 ) or cyclohexanols ( 6 ). 20 compounds 2 and 3 with substituents in the p-position of the peripheric rings have been synthesized; liquid crystalline data are given.     

Siloxanylpyrroline und -pyrrolinium Derivate. Synthese und Charakterisierung

The synthesis of the title compounds was carried out by hydrosilylation of 1,4-dichlorobut-2-yne ( 1 ) with defined siloxanes ( 2a-c ) using a platinum catalyst, followed by the reaction of the received 1,4-dichloro-2-siloxanyl-but-2-enes ( 3a-c ) with primary, secondary and tertiary amines, respectively. N-Alkyl-3-(siloxanyl)pyrrolines ( 4,5,6 ) were reacted with alkyl bromides and sultones, respectively. The products were characterized by elemental analysis and ¹³C-n.m.r.-spectroscopy and posses remarkable surface activity. The X-ray crystal structure of N-ethyl-3-(1,1,1,3,5,5,5-heptamethyltrisiloxan-3-yl)pyrroline hydrochloride was determined.     

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.     

Synthese und Charakterisierung photochromer 2,2′-Dinitro-diphenylmethane

Synthesis and Characterization of Photochromic 2,2′-Dinitrodiphenylmethanes Photochromic methyl-, amino-, nitro- and formyl-derivatives of 2,2′-dinitro-diphenylmethane 1 are synthesized by nitration of the substituted diphenylmethanes. They react with aromatic aldehydes or activated benzylcompounds respectively to the photochromic compounds 6a, 6b and 5c–5f containing phenyl-vinylen and phenyl-azavinylen units. Condensations with corresponding bifunctional compounds yield oligomers, the Knoevenagel-product is soluble and photochromic. The synthesized 2,2′-dinitro-diphenylmethanes are photochromic in solution. The thermal back reaction is described by first order kinetics. Methyl groups decrease and, on the other hand, nitro functions increase the lifetime of the coloured polymethinform.