Received 28 September 2013
aFaculty of Technology and Chemical Engineering, University of Technology and Life Sciences, Seminaryjna 3, PL-85-326 Bydgoszcz, Poland,bDepartment of Chemistrycv5431, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland, and cStructural Chemistry and Crystallography Group, University of Lodz, Pomorska 163/165, PL-90-236 Lódz, Poland
Correspondence e-mail: firstname.lastname@example.org
The asymmetric unit of the title compound, C14H22N4O2·0.25C6H14·0.5H2O, contains two independent molecules of 2,4-bis(pivaloylamino)pyrimidine (M) with similar conformations, one water molecule and one-half n-hexane solvent molecule situated on an inversion center. In one independent M molecule, one of the two tert-butyl groups is rotationally disordered between two orientations in a 3:2 ratio. The n-hexane solvent molecule is disordered between two conformations in the same ratio. The water molecule bridges two independent M molecules via O-HO, N-HO and O-HN hydrogen bonds into a 2M·H2O unit, and these units are further linked by N-HN hydrogen bonds into chains running in the  direction. Weak C-HO interactions are observed between the adjacent chains.
For the related structures of 2,4-bis(acyloamino)pyrimidines in the solid state and in solution, see: Osmialowski et al. (2012). For the related structures of 2,6-bis(acyloamino)pyridines, see: Osmialowski et al. (2010); Crane (2003).
Data collection: COLLECT (Bruker, 2008); cell refinement: DENZO-SMN (Otwinowski & Minor, 1997); data reduction: DENZO-SMN; program(s) used to solve structure: SIR2004 (Burla et al., 2005); program(s) used to refine structure: SHELXL2013 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL2013 and publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: CV5431 ).
The financial support from the National Science Centre in Kraków (grant No. NCN204 356840) is gratefully acknowledged. Academy Professor Kari Rissanen is also gratefully acknowledged for financial support (Academy of Finland grant Nos. 122350, 140718, 265328 and 263256).
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