Analysis of XRD Structural Parameters of Glycoluril and Its Derivatives

Dimroth-type N/S-interchange of N-aminothioglycolurils in the synthesis of 2-hydrazonoimidazo[4,5-d]thiazolones

“…Other diastereomer with the trans arrangement of hydrogen atoms or other substituents at the bridged C(3a) and C(6a) atoms has never been observed. 10,11,15 A plausible rearrangement mechanism is depicted in Scheme 6. Probably, rearrangement is a result of imidazolidinethione ring opening of compound 8 upon treatment with acid and recyclization of the thiazolidine ring involving other nucleophilic center, sulfur atom.…”

N-Nitrosation of Glycolurils Catalyzed by 1-Hydroxyethylidene-1,1-diphosphonic Acid

“…Having the developed H-bond network [15], 1,5-dimethylglycoluryl (1b) is poorly soluble in water and to dissolve it, requires heating under refl ux together with HEDP for 30 min. After the dissolution of compound 1b, the resulting solution is rapidly cooled to 0°C, and then sodium nitrite is added.…”