On November 26, 1976, there was a patent about herbicides.Category: pyridine-derivatives The title of the patent was Herbicidal quaternary bipyridylium salts. And the patent contained the following:
The salts I (R, R1 = alkyl, alkenyl, alkynyl, substituted alkyl; X, X1 = Cl, Br, iodo, 4-MeC6H4SO3) (104 compounds) were prepared by quaternization. Thus 4,4′-bipyridine was treated with EtI and 4-(4-pyridyl)pyridinium ethiodide treated with CH2:CMeCH2I to give I (R = Et, R1 = CH2CMe:CH2, X = X1 = iodo). At 1 kg/ha I (R = Et, R1 = CH2CMe:CH2, X = X1 = iodo) post emergence gave ∼80% control of Avena fatua. The experimental process involved the reaction of 1,1′-Dipropyl-[4,4′-bipyridine]-1,1′-diium bromide(cas: 52243-87-5).Category: pyridine-derivatives
The Article related to bipyridinium salt, quaternary bipyridinium salt, herbicide bipyridinium salt, Heterocyclic Compounds (One Hetero Atom): Pyridines and other aspects.Category: pyridine-derivatives