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Treatment of phenyl(4‐pyridazinyl)methanols 1a and 1b with p‐toluenesulfonic acid at elevated temperatures causes transformation into the C‐4 substituted pyrazole derivatives 8a and 8b. Limitations of this novel rearrangement reaction as well as mechanistic considerations are discussed. Furthermore, the preparation of hitherto unknown 4‐pyridazinylmethanols 1b, 3, and 7 is described.
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Heinisch et al. (1984) studied this question.
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