Synthesis and crystal structure of N-tert-butyl-N '-(2,4-dichlorobenzoyl)-N-[1-(4-chlorophenyl)-1, 4-dihydro-6-methylpyridazine-4-oxo-3-carbonyl] hydrazine

The title compound N-tert-butyl-N'-(2,4-dichlorobenzoyl)-N-[l-(4-chlorophen yl)1,4-dihydro-6-methylpyridazine-4-oxo-3-carbonyl]hydrazine [(C23H21N4O3Cl 3)(2).1.5H(2)O, M-r = 1042.60] was prepared by the reaction of 1-(4-chlorop henyl)-1,4-dihydro-4-oxo-6-methylpyridazine-3-carboxylic acid with chlorofo rmate ethyl ester, then with N-tert-butyl-N-(2,4-dichlorobenzoyl) hydrazine in the present of triethylamine. The crystal structure has been determined by X-ray diffraction. The crystal belongs to Monoclinic, space group P2(1) /c, with unit cell constants a =11.4948(9), b=12.7495(10), c=35.854(3) Angs trom,beta =92.964(2)degrees, Z=4, V=5247.6(7) Angstrom (3), D-c= 1.320 Mg/m (3), F(000) = 2156, mu (MoK alpha)= 0.385, R = 0.0661, wR = 0.1875, for 915 1 observed reflections(I >2 sigma (I)). The structure is a dimer linked by intermolecular hydrogen bond which can be observed between N(1)-H . . .O(6) , N(5)-H . . .O(3). The distances are 2.068 and 2.027 Angstrom respectively .