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12.1.1.2.1.1.1.2 Variation 2: From 3,3-Dialkoxyalkan-1-ones and Hydrazines

DOI: 10.1055/sos-SD-012-00002

Stanovnik, B.; Svete, J.Science of Synthesis, (20021224.

The reaction of 3,3-dialkoxybutan-1-ones with substituted hydrazines can potentially give a mixture of 1,3- and 1,5-disubstituted pyrazoles; however, in the absence of an acid only one pyrazole is formed. In this case, the corresponding hydrazone 6 of the carbonyl group is initially formed as an intermediate and this is followed by cyclization to the 1,3-disubstituted pyrazole derivative 7 (Scheme 8).[‌78‌]

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