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- W1997950072 abstract "1,2,3-Triazabutadienes. XIV. Investigations into the Acidic Cleavage of the Z-E-Isomeric 1-Aryl-3-[3-methylbenzthiazolinyliden-(2)]- and 1-Aryl-3-[1,3-dimethylbenzimidazolinyliden-(2)]-triazenes The rate of the acid cleavage of the Z-E-isomeric 1-aryl-3-[3-methylbenzthiazolinyliden-(2)]- and 1-aryl-3-[1,3-dimethyl-benzimidazolinyliden-(2)]-triazenes 1–5 is investigated in dependence on the substituents in the aryl and benzo residue. The Z-isomeric triazabutadienes are cleft 103 to 105 times faster than the E-isomers. The ρ-values are significantly smaller than the ρ-values of the cleavage of other triazen derivatives. This is explained by an opposite influence of substituents regarding the cleavage of the N2-N3-bond and the equilibrium of protonation of the triazabutadienes. Triazabutadienes with a pronounced polymethine like structure decompose more rapidly than is conformable to their σ-values. For the E-isomers a V-shape of the Hammett-correlation is found. The considerable differences in the rate of heterolysis of the Z-E-isomers can be used for a negatively working diazo material which is sensitive to visible light." @default.
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- W1997950072 title "1, 2, 3-Triazabutadiene. XIV. Untersuchungen zur sauren Spaltung Z-E-isomerer 1-Aryl-3-[3-methylbenzthiazolinyliden-(2)]- und 1-Aryl-3-[1,3-dimethylbenzimidazolinyliden-(2)]-triazene" @default.
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- W1997950072 doi "https://doi.org/10.1002/prac.19813230210" @default.
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