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Halogenation of 1-Ethoxy-1-oxophosphindolin-3-one, a Potential Phosphaindigo Precursor

✍ Scribed by Vollbrecht, Sebastian ;Ruthe, Frank ;Jones, Peter G. ;Mont, Wolf-Walther Du ;Grahn, Walter

Book ID: 102790395
Publisher: Wiley (John Wiley & Sons)
Year: 1997
Tongue: English
Weight: 564 KB
Volume: 130
Category: Article
ISSN: 0009-2940
DOI: 10.1002/cber.19971301210

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## Abstract In contrast to previous reports, 4‐ethoxy‐1,1,1‐trifluoro‐3‐buten‐2‐one (**1**) was observed to react with methylhydrazine (**2**) in refluxing ethanol to yield 1‐methyl‐3‐(trifluoromethyl)pyrazole (**6**) and 4,5‐dihydro‐1‐methyl‐5‐(trifluoromethyl)pyrazol‐5‐ol (**4**). The later compo