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- W2131608120 abstract "Abstract Durch Umsetzung von Acetylendicarbonsäure‐ dimethylester mit Hydrazinen oder Alkyl‐hydrazonen erhält man die 1‐Alkyl‐3‐hydroxy‐5‐pyrazolcarbonsäure‐methylester 9 und 13a – e , durch Verseifung und Decarboxylierung hieraus die 1‐Alkyl‐3‐hydroxypyrazole 11 und 15a – e . Die Cyclisierung von 13f zum Lacton 19a ist strukturbeweisend. Bei Verwendung von Benzaldehyd‐hydrazonen entstehen hauptsächlich 2‐Pyrazolin‐4,5‐ dicarbonsäureester." @default.
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- W2131608120 date "1974-04-01" @default.
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- W2131608120 title "Enhydrazine, 9. 1‐Alkyl‐3‐hydroxypyrazole aus Hydrazonen oder Hydrazinen" @default.
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- W2131608120 doi "https://doi.org/10.1002/cber.19741070428" @default.
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