BACKGROUND Some novel substituted pyrazolone, pyrazolo[3,4-c]pyridazine, pyrazolo[3,4-d]pyrimidine, pyrazolo[3,4-d]thiazolo[3,2-a]pyrimidinone, thieno[3,2-c]pyrazole and pyrazolo[3',4':4,5]thieno[2,3-d]pyrimidine derivatives have been reported to possess various pharmacological activities like antimicrobial, antitumor and anti-inflammatory. RESULTS A novel series of azoles and azines were des...

In the title compound, C(5)H(8)N(3)O(+)·ClO(4) (-)·C(5)H(7)N(3)O·H(2)O, each perchlorate anion is paired with a protonated cationic 2-amino-6-methyl-pyrimidin-4(1H)-one and another non-protonated entity of the same organic pyrimidinone. The crystal structure is stabilized by N-H⋯O(org), N-H⋯O(water), N-H⋯O(ClO4), O-H⋯O(ClO4), N-H⋯N and C-H⋯O(ClO4) hydrogen bonds between the anions, organic enti...

Monomers of allopurinol and 9-methylhypoxanthine were studied using the matrix isolation technique combined with Fourier transform infrared spectroscopy. The oxo tautomeric forms of both compounds were found to dominate in freshly deposited low-temperature argon matrices. For 9-methylhypoxanthine, a small amount of the hydroxy tautomer was also detected in an Ar matrix before any irradiation. U...

Herein, we investigate the influence of spacer length on the homoassociation and heteroassociation of endfunctionalized hydrogen-bonding polymers based on poly(nbutyl acrylate). Two monofunctional ureido-pyrimidinone (UPy) end-functionalized polymers were prepared by atom transfer radical polymerization using self-complementary UPyfunctional initiators that differ in the spacer length between t...

In the title compound, C(20)H(21)N(5)O(4), the ring system containing the three fused rings is essentially planar (r.m.s. deviation for all 12 non-H atoms = 0.041 Å). The phenyl ring makes a dihedral angle of 54.41 (6)° with this ring system. The isopropyl group is disordered over two positions, with site-occupancy factors of 0.753 (9) and 0.247 (9). The structure is mainly stabilized by weak i...

The reversible and dynamic nature of non-covalent interactions between the constituting building blocks renders many supramolecular polymers stimuli-responsive. This was previously exploited to create thermally and optically healable polymers, but it proved challenging to achieve high stiffness and good healability. Here we present a glass-forming supramolecular material that is based on a trif...