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- W2007994889 abstract "Synthesis of Substituted 2-Nitrophenylhydrazones of 2-Oxodicarboxylic Acid Esters and Investigation of Their Tautomerism and Absorption Behaviour 32 Substituted 2-nitrophenylhydrazones of diethyl oxalacetate, 2-oxoglutaric acid and its 1-mono- and 1,5-dialkyl esters, resp., have been synthesized from substituted 2-nitrophenylhydrazines and 4,6-dinitro-1,3-dihydrazinobenzene and the carbonyl compounds named above. 1H-n.m.r. spectra prove all products to have the constitution of hydrazones and not that of azo compounds or enhydrazines and also allow the assignation of the E- and Z-configuration, resp., to the hydrazone diastereomers. The absorption behaviour of all hydrazones is discussed with comparison of the different substitution patterns. Unexpectedly, the 4,6-dinitro-1,3-bishydrazones 27 – 32 show very high lg ϵmax values (at about 4.8) due to their crossed two chromophoric systems." @default.
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- W2007994889 date "1992-01-01" @default.
- W2007994889 modified "2023-09-27" @default.
- W2007994889 title "Synthese substituierter 2-Nitrophenylhydrazone von 2-Oxodicarbons�ureestern und Untersuchung ihres Tautomerie- und Absorptionsverhaltens" @default.
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- W2007994889 doi "https://doi.org/10.1002/prac.19923340311" @default.
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