Journal of Organic Chemistry p. 1986 - 1993 (1990)
Update date:2022-08-30
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Morgan, Robert J.
Baker, A. David
An efficient preparation of 2,2':4,4'':4',4'''-quaterpyridyl (qpy) from 4,4'-bipyridine is described, using palladium on charcoal.Conditions are described for the selective methylation of the nitrogen atoms present.This has allowed the preparation of mono- and dimethylquaternary salts that retain an α-diimine site for complexation to a metal.These quarternary salts can be used to prepare complexes in which metal ions are coordinated to viologen-type ligands.Electrochemical and spectroscopic measurements of the diquarternary salt derived from qpy suggest that it behaves as two separate or weakly interacting monoquat moieties.
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