title: 3,6-Dichloro-4-[2-(4-thiamorpholino)ethanesulfanyl]pyridazine and 3,6-bis(pyrazol-1-yl)-4-[2-(4-thiamorpholino)ethanesulfanyl]pyridazine.
abstract: The trans-trans conformations adopted by the derivatized bis(bidentate) chelating N(4)-donor ligand 3,6-bis(pyrazol-1-yl)-4-[2-(4-thiamorpholino)ethanesulfanyl]pyridazine, C(16)H(19)N(7)S(2), and an intermediate in its formation, 3,6-dichloro-4-[2-(4-thiamorpholino)ethanesulfanyl]pyridazine, C(10)H(13)Cl(2)N(3)S(2), contrast with the cis-cis conformation found previously for 3,6-bis(thiophen-2-yl)pyridazine [Ackers, Blake, Hill & Hubberstey (2002). Acta Cryst. C58, o640-o641], which places all four heteroatoms on the same side of the molecule.
authors.affiliation: School of Chemistry, The University of Nottingham, University Park, Nottingham NG7 2RD, England. a.j.blake@nottingham.ac.uk
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Blake
authors.forename: Peter
authors.initials: P
authors.lastname: Hubberstey
authors.forename: Alexander D
authors.initials: AD
authors.lastname: Mackrell
authors.forename: Claire
authors.initials: C
authors.lastname: Wilson