organic compounds
Open access
The title compound, C35H35ClN4O3, resulted from a spirolactam ring closure of rhodamine B dye. The xanthene ring system is approximately planar [r.m.s. deviation = 0.050 (9) Å for the xanthene ring]. The dihedral angles formed by the spirolactam and 5-chloro-2-hydroxybenzene rings with the xanthene ring system are 87.9 (7) and 79.1 (7)°, respectively.
organic compounds
Open access
The title compound, C24H22N4O2·H2O, was synthesized by the trimethylchlorosilane-catalysed reaction between urea, benzaldehyde and acetophenone. The organic molecule comprises two fused tetrahydropyrimidinone rings with phenyl substituents at the 4- and 5-positions on the tetrahydropyrimidinone rings and a third phenyl substituent at the ring junction 8-position. The 4- and 5-substituted phenyl rings are inclined at a dihedral angle of 22.72 (11)° to one another and make angles of 47.95 (7) and 65.76 (7)° with the third phenyl substituent. In the crystal structure, intermolecular N—HO contacts link pyrimido[4,5-d]pyrimidine molecules into centrosymmetric dimers. Additional N—HO and O—HO hydrogen bonds involving the water molecule generate a three-dimensional network.