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- W2143260069 abstract "1,3-Disubstituted 1H-pyrazole-4-carbaldehyde-N,N-dimethylhydrazones 1 reacted with the Vilsmeier-Haack reagent, corresponding to the aza-enamine concept, in an electrophilic substitution reaction at the azomethine C-atom yielding the 1,4,5-triaza-pentadienium salts 2. These were hydrolysed to give 2-hydrazono-2-(1H-pyrazole-4-yl)ethanals 3. The electrophilic attack did not take place at the vinylogous position 5′ of the pyrazoles." @default.
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- W2143260069 date "2003-01-01" @default.
- W2143260069 modified "2023-09-27" @default.
- W2143260069 title "Aza-enamines X:Formylation of Pyrazole-4-carbaldehydeHydrazones at the Hydrazonoazomethine C-Atom" @default.
- W2143260069 doi "https://doi.org/10.1055/s-2003-40527" @default.
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