
TY  - JOUR
A1  - O'Connell, MJ 
A1  - Ramsay, CG 
A1  - Steel, PJ 
T1  - Heterocyclic Tautomerism. II. 4-Acylpyrazolones. X-Ray Crystal Structures of 4-Benzoyl-5-methyl-2-phenylpyrazol-3(2<i>H</i>)-one and 4-Acetoacetyl-3-methyl-1-phenylpyrazol-5-ol
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1985
VL  - 38
IS  - 3
SP  - 401
EP  - 409
KW  - 
UR  - https://doi.org/10.1071/CH9850401 
N2  - The colourless crystalline form of the benzoylpyrazolone (2) has molecules with the NH structure (2c) stabilized by intermolecular hydrogen bonds. At room temperature crystals are monoclinic: P21/c, a 13.508(5), b 9.124(4), c 11.451(3)&#506;, &#946; 90.80(3)&#176;, Z4; the structure was refined to R 0.059, Rw 0.048. The acetoacetylpyrazolone (3) has the OH structure (3c) with two intramolecular hydrogen bonds. At 193 K crystals are triclinic: P&#299; , a 7.142(2), b 13.704(8), c 14.699(7)&#506;, &#945; 117.36(3), &#946; 96.87(3), &#947; 93.73(3)&#176;, Z 4; the structure was refined to R 0.049, Rw 0.054. 
ER  -

