| 摘要 |
1,242,711. Manufacture of 1,1<SP>1</SP>-substituted bipyridylium salts. IMPERIAL CHEMICAL INDUSTRIES Ltd. 19 March, 1969 [5 April, 1968; 29 May, 1968], Nos. 16474/68 and 25774/68. Heading C2C. A process for the manufacture of 1,1<SP>1</SP>-disubstituted - 4,4<SP>1</SP> - bipyridylium salts or 1,1<SP>1</SP> -<SP> </SP>disubstituted - 2,2<SP>1</SP> - bipyridylium salts comprises treating the corresponding 1,1<SP>1</SP>-disubstituted - 1,1<SP>1</SP>,4,4<SP>1</SP> - (or - 1,1<SP>1</SP>,2,2<SP>1</SP> -) tetrahydro- 4,4<SP>1</SP>- (or -2,2<SP>1</SP>-) bipyridyl with an inorganic oxyacid anhydride or a salt of a metal capable of existing in at least two valency states wherein the metal is in a higher valency state, the redox potential in water of the anhydride or the metal salt between different valency states of the metal being more positive than - 1À48 volts as compared with the saturated calomel electrode. |
