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- W2012127824 abstract "Über die Silbersalze des Pyrazols und der 3- oder 4-Halogen-pyrazole läßt sich eine stufenweise Halogenierung durchführen. So entstehen aus dem Silbersalz 1 des Pyrazols die 4-Halogen-pyrazole und aus den Silbersalzen 5a –c bzw. 7 die 3(5).4-Dihalogen-pyrazole. Trihalogen-pyrazole werden entweder aus 5a – c mit 2 Moläquivalenten Halogen oder aus dem Silbersalz 9 eines 3(5).4-Dihalogen-pyrazols bereitet. Bei der Chlorierung entstehen Kondensationsprodukte aus mehreren Pyrazolmolekülen als Nebenprodukte. Aus 1 erhält man 4.4′-Dichlor-bipyrazolyl-(1.3′(5′)) (3), aus 5a neben 3 ein Trichlor-terpyrazolyl der Struktur4. Syntheses with Silver or Sodium Pyrazoles, I. Preparation of Mono- and Polyhalopyrazoles A stepwise chlorination of pyrazole and of 3- or 4-halopyrazoles can be carried out via their silver salts. The silver salt 1 of pyrazol yields 4-halopyrazoles and the silver salts 5a –c of halopyrazoles yield 3(5),4-dihalopyrazoles. Trihalopyrazoles are prepared either from 5a –c with 2 moles of halogen or from the silver salt 9 of a 3(5),4-dihalopyrazole. In addition chlorination produces side products formed by the condensation of several pyrazole molecules. 4,4′-Dichloro-1,3′(5′)-bipyrazolyl (3) is obtained from 1 and a trichloroterpyrazolyl having structure 4 is obtained from 5a together with 3." @default.
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- W2012127824 title "Synthesen mit Silber‐ bzw. Natrium‐pyrazolen, I. Darstellung von Mono‐ und Polyhalogen‐pyrazolen" @default.
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- W2012127824 doi "https://doi.org/10.1002/cber.19701030633" @default.
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