Synthesis and structure of [2-oxo(thioxo)tetrahydropyrimidin-4-yl]calix[4]arenes

Crystal structure of methyl 4-(4-hydroxyphenyl)-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate monohydrate

“…These structures include four 2-hydroxyphenyl-substituted DHPM molecules, one 3-hydroxy-substituted and eleven 4-hydroxyphenyl-substituted DHPM molecules. It is interesting to note that five of the 4-hydroxyphenyl-substituted DHPM molecules prefer to crystallize in a hydrated form (ZOHFIN: Vishnevskii et al 2014;VOJDOO: Das et al, 2008;VOJDOO01: Nayak et al, 2009;POWXIJ: Thenmozhi et al, 2009;XISMES: Liu et al, 2008). However, of these only ethyl 4-(4-hydroxyphenyl)-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5 carboxylate (VOJDOO: Das et al, 2008) crystallizes with a higher formula unit (Z 0 > 1), i.e.…”