Application of 1698-53-9, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1698-53-9, Name is 4,5-Dichloro-2-phenylpyridazin-3(2H)-one, molecular formula is C10H6Cl2N2O. In a Article，once mentioned of 1698-53-9
A novel ring contraction for the conversion of 2,7-disubstituted 10H-dipyridazino<4,5-b:4',5'-e><1,4>thiazine-1,6-(2H,7H)-diones (4’a-c) into the corresponding 2,6-disubstituted 9H-dipyridazino<4,5-b:4',5'-d>pyrrole-1,5(2H,6H)-diones (7’a-c), through a base-induced extrusion of sulfur, is described.Heating of 4’a-c in dimethylformamide in the presence of potassium carbonate smoothly afforded 7’a-c, respectively, in good yields, although neither 2,8-dimethyl-10H-dipyridazino<4,5-b:4',5'-e><1,4>thiazine-1,9(2H,8H)-dione (5’a), nor 3,7-dimethyl-10H-dipyridazino<4,5-b:4'5'-e><1,4>thiazine-4,6(3H,7H)-dione (6’a) was susceptible to similar reaction conditions.The mechanism of the ring contraction, which may involve an intermediate (anion, C-) containing a thiirane ring, is also discussed.Keywords – pyridazine; dipyridazino<1,4>thiazine; dipyridazino<4,5-b:4'5'-d>pyrrole; sulfur extrusion; ring contraction; Smiles rearrangement; photochemical cyclization.
We’ll also look at important developments in the pharmaceutical industry because understanding organic chemistry is important in understanding health, medicine, the role of 1698-53-9, and how the biochemistry of the body works.Application of 1698-53-9
Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N3098 – PubChem