Recommanded Product: 6-Hydroxy-2-methylpyrimidin-4(3H)-one. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 6-Hydroxy-2-methylpyrimidin-4(3H)-one, is researched, Molecular C5H6N2O2, CAS is 1194-22-5, about Investigation of FOX-7 Polymorphs: new polymorphs – ε and ζ. Author is Kushtaev, Alexander A.; Yudin, Nikolay V.; Kondakova, Natalia N.; Ilicheva, Natalia N.; Vu, Tuan Q.; Zbarskiy, Vitold L..
Polymorphism of 1,1-diamino-2,2-dinitroethene (FOX-7, DADNE) has investigated by X-ray powder diffraction (XRD), differential scanning calorimetry (DSC), thermo gravimetric anal. (TGA), IR-spectroscopy. Two previously unknown polymorph modifications of FOX-7 – ε and ζ were discovered. ε-FOX-7 has prepared by hydrolysis of 2-(dinitromethylene)-5,5-dinitropyrimidine-4,6(1H,3H,5H)-dione in a media with pH up 7-8 to Ho≈-3 and 2-(dinitromethylene)imidazolidine-4,5-dione in aqueous ammonia. Ε-FOX-7 is a stable and exists in temperature range 273-378 K. ζ-polymorph of FOX-7 can be obtained at ε-FOX-7 heating to 378-380 K. ζ→ε polymorph transition is a reversible and occurs at 361.7±3.1 K. At 433-453 K ζ-FOX-7 transforms to γ-polymorph. ζ→γ phase transition temperature range was determined using IR-spectroscopy because it is invisible on DSC curves. IR-spectra of ε and ζ polymorphs are significantly distinct from α-, β- and γ-FOX-7. ε-FOX-7, in contrast to monoclinic α-polymorph, has orthorhombic type of crystal system (space group P212121). Based on received data, new scheme of FOX-7 polymorph transition is proposed.
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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem