Cushman, Darby & Cushman
Manufacture of 1,1'-dialkyl-4,4'-bipyridylium salts
 A 1,1'-dialkyl-4,4'-bipyridylium salt is prepared from the corresponding 4,4'-bipyridyl using an alkylsulphate salt as the quaternizing agent. 
Imperial Chemical Industries Limited
C
C07D
inventional
John Reginald Geoffrey James
Case Moore