Trapping of Zn-Complex with Bis(tetrazole) Ligand during the Demko-Sharpless' Tetrazole Synthesis

The reaction of malononitrile with Z nCl 2 and NaN 3 in the presence of 2,2'-bipyridine a nd water affords the first bis(tetrazole)Zn-complex intermediate,mono(2,2'-bipyridine)bis(tetrazolyl)methane aqua zinc*",[Zn(2,2' -bpy)(BTZ)(H 2 O)]·(H 2 O) 2 (1)which gives a clue for Demko-Sharple ss' tetrazole synthesis.Crystal data for1:C 13 H 18 N 10 O 4 Zn,M r =443.74,monoclinic,space group P2 1 /c,a=12.5705(18),b=16.078(2),c=9.1921(13)*!,β=95.010(3)°,V=1850.7(5)*! 3 ,Z =4.CCDC:197788.