96017-19-5

Upstream product

• 41933-33-9 2-benzyl-4,5-dichloro-3(2H)-pyridazinone 

Downstream Products

• 59026-56-1 2-benzyl-5-benzylidene-hydrazino-4-chloro-3(2H)-pyridazinone 
• 96017-21-9 2-Benzyl-4-chloro-5-{N'-[1-(2-methoxy-phenyl)-meth-(E)-ylidene]-hydrazino}-2H-pyridazin-3-one 
• 59026-45-8 5-benzyl-1-methyl-3-phenyl-1H-pyrazolo<3,4-d>pyridazin-4(5H)-one 
• 59026-51-6 2-Benzyl-4-chloro-5-{N-methyl-N'-[1-phenyl-meth-(E)-ylidene]-hydrazino}-2H-pyridazin-3-one 
• 96017-41-3 1,5-Dibenzyl-3-(2-methoxy-phenyl)-1,5-dihydro-pyrazolo[3,4-d]pyridazin-4-one 
• 96017-31-1 2-Benzyl-5-{N-benzyl-N'-[1-(2-methoxy-phenyl)-meth-(E)-ylidene]-hydrazino}-4-chloro-2H-pyridazin-3-one 

Relevant academic research and scientific papers

SYNTHESIS OF PYRAZOLOPYRIDAZINE DERIVATIVES- TWO COMPARABLE APPROACHES, RING CONTRACTION THROUGH EXTRUSION OF SULPHUR AND PHOTOCHEMICAL CYCLISATION

Ring contraction of 7-substituted 2-phenyl-4H-pyridazinothiadiazin-8(7H)-ones (5a-d) to 5-substituted 3-phenyl-1H-pyrazolopyridazin-4(5H)-ones (7a-d), through base-induced extrusion of sulphur, is described.Similar reactions proceed, not only on the 4-acetyl derivatives (4a-d) in basic media, but on 5a and the 4-methyl derivative (6a) thermally.Probable mechanism of these reactions are discussed.A comparable approach to the ring contraction, photochemical cyclisation of 2-substituted 5-(1-alkyl-2-benzylidenehydrazino)-4-chloro-3(2H)-pyridazinones (9a-e) to the corresponding 1-alkylpyrazolo-pyridazinone derivatives (8a-e) is also performed.