title: Tetraaquabis[5-(4-pyridyl N-oxide)tetrazolato-kappaN(2)]cadmium: the intermediate in the synthesis of a tetrazole from a nitrile and an azide.
abstract: The intermediate [Cd(4-PTZ)(2)(H(2)O)(4)] [4-PTZ is 5-(4-pyridyl N-oxide)tetrazolate, C(6)H(4)N(5)O], (I), in the synthesis of 4-HPTZ, (II), from the cycloaddition reaction of 4-cyanopyridine N-oxide with NaN(3) in water using CdCl(2) as catalyst, was structurally characterized. The unique Cd atom lies on a twofold axis and the coordination geometry of the Cd atom is that of a slightly distorted octahedron, involving four water molecules and two tetrazolate ligands. The catalytic role of the Cd(2+) ion in the tetrazole generation reaction stems from the formation of (I). In acidic solution, (I) can be disassociated and the free ligand, (II), can be released.
authors.affiliation: Department of Chemistry, Tongji University, Siping Rd, Shanghai 200092, People's Republic of China.
authors.forename: Zhao Xiang
authors.initials: ZX
authors.lastname: Yu
authors.forename: Xiao Ping
authors.initials: XP
authors.lastname: Wang
authors.forename: Yaoyu
authors.initials: Y
authors.lastname: Feng