An improved procedure for the preparation of 1-aryl-4-hydroxy-1 H-pyrazoles

C Lamberth

Index: Lamberth, Clemens Organic Preparations and Procedures International, 2002 , vol. 34, # 1 p. 98 - 102

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Abstract

All new compounds were characterized by standard spectroscopical and microanalytical methods.'H-NMR spectra were recorded on a Varian Gemini 300 spectrometer at 300 Mhz, using CDCI, or (CD,), SO as solvents and TMS as internal standard. Chemical shifts are reported in ppm downfield from the standard (6= 0.00). Elemental analyses were perfoxmed on a Heraeus CHN-Rapid Analyser. Melting points were determined on a Buchi 535 ...