
%0 Journal Article
%A O'Connell, MJ 
%A Ramsay, CG 
%A Steel, PJ 
%T 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
%J Australian Journal of Chemistry
%D 1985/03/01
%V 38
%N 3
%P 401-409
%K 
%R https://doi.org/10.1071/CH9850401
%U https://www.publish.csiro.au/paper/CH9850401 
%X 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. 
