Journal
TETRAHEDRON LETTERS
Volume 45, Issue 41, Pages 7679-7682Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2004.08.100
Keywords
regioselectivity; 1,5-diarylpyrazoles; 1D NOESY; LC-NMR
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The factors affecting regioselectivity during the formation of 1,5-diarylpyrazoles from aryl hydrazines and 1,3-diketones are identified and the regioisomers were characterized by 1D NOESY, LC-NMR and X-ray analyses. A simple alteration in the usual reaction conditions is reported, which allows the exclusive formation of 1,5-diarylpyrazoles. (C) 2004 Elsevier Ltd. All rights reserved.
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