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3,5-Di­hydroxy-2-hydroxy­methyl-4H-pyran-4-one

✍ Scribed by Yao, Guang-Min ;Wang, Yu-Bo ;Wang, Li-Quan ;Qin, Guo-Wei


Publisher
International Union of Crystallography
Year
2005
Tongue
English
Weight
242 KB
Volume
61
Category
Article
ISSN
1600-5368

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The crystal structure of the racemic title compound, C~12~H~12~O~3~, allowed the determination of the relative configuration at the two stereogenic centers. For the __R,R__ isomer, the O—C—C—O and C—C—C—C torsion angles around the bond between the two methine C atoms are 62.38 (15) and −175.49 (13)°

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## Abstract Phenylhydrazine or hydrazine react with 3‐acetyl‐4‐hydroxy‐6‐methyl‐2__H__‐pyran‐2‐one (1) to give 4‐acetoacetyl‐3‐methylpyrazolin‐5‐ones 4. The synthesis of bipyrazoles and pyrazoloisoxazoles from 4 are reported.