Cushman, Darby & Cushman
Manufacture of 1,1'-dialkyl-4,4'-bipyridylium salts
 A 1,1'-dialkyl-4,4'-bipyridylium salt is prepared by reacting the corresponding 4,4'-bipyridyl with a diloweralkylsulphate in the presence of a mineral acid. 
Imperial Chemical Industries Limited
C C
C07D C07D
inventional inventional
John Reginald Geoffrey James
Case Moore