Synthesis and Crystal Structure of 2-tert-Butyl-5-（4-tert-butylbenzylthio）- 4-chloropyridazin-3 （2H） -one

The title compound, 2-ten-butyl-6 （4-ten -butylbenzylthio） -4-chloropyridazin-3 （ 2H ） -one, was synthesized from 1 -ten-butylhydrazine, （ Z ） -2,3 -dichloro-3 -formylacrylic acid and （ 4 -tert -butylphenyl ） methanethiol in several steps. It crystallized in an orthorhombic space group Pnma with Mr = 364. 93 （ C19H25 ClN2OS）, a = 1. 0091 （2） nm, b = 0.7076（2） nm, c=2. 8103（5） nm, V=2.0066（6） nm^3, Z=4, Dc =1. 192 g/cm^3, F（000） =765, μ=0.301 mm , final R1 = 0. 0665, and wR = 0. 1913 for 1927 unique reflections. Inter- and intramolecular hydrogen bond C-H…O interactions stabilize the structure.