On April 30, 1980, Chen, Ming-Feng published a patent.HPLC of Formula: 52243-87-5 The title of the patent was 1,1′-Dialkyl-4,4′-bipyridylium dihalide. And the patent contained the following:
The title compounds I (R = C1-3 alkyl; X = Cl, Br) were obtained by quaternizing 4,4′-bipyridine (II) with haloalkanoic acid. Thus II was treated with ClCH2CO2H at 120° to give 99% I (R = Me, X = Cl). The experimental process involved the reaction of 1,1′-Dipropyl-[4,4′-bipyridine]-1,1′-diium bromide(cas: 52243-87-5).HPLC of Formula: 52243-87-5
The Article related to bipyridine quaternization haloalkanoate, dialkylbipyridinium halide, Heterocyclic Compounds (One Hetero Atom): Pyridines and other aspects.HPLC of Formula: 52243-87-5