Abstract
4,5-Bis(diphenylphosphino)-1-phenylpyridazin-6-one reacts with ethyl iodide, 1,2-dichloroethane, 1,2-dibromomehtane, and o-dibromobenzene to give the corresponding bis-phosphonium salts which, depend- ing on the halogen derivative, can undergo further transformations involving cleavage of the PAC bond in the β-position with respect to the carbonyl group.
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