cif-access (organic compounds)
In C10H11Cl2N3O (R1 = H, R2 = CH2OH), (I), and C22H29Cl2- N3O4 (R1 = COCHMe2, R2 = CH2OCOCHMe2), (II), the bonds connecting the phenyl and imidazolidine rings are shorter than that observed in clonidine, indicating increased double-bond character. The imidazolidine rings adopt a half-chair conformation in both structures and the dihedral angles between the imidazolidine and phenyl rings are 86.97(7) and 66.32(6)° in (I), and 62.4(1)° in (II).