| 摘要 |
A 4,41-bipyridylium salt is separated from a solution containing it by a method comprising treating the solution with amsonic acid (4,41-diamino - stilbene - 2,21 - disulphonic acid) so that the 4,41-bipyridylium salt of amsonic acid is precipitated. The amsonic acid salt of 4,41-bipyridyl is claimed per se. The process is applicable to the separation of salts of 4,41-bipyridyl and also of N,N1-dialkyl-4,41-bipyridyls. The amsonic acid salts may be separated and treated with an aqueous solution of an acid, e.g. sulphuric, hydrochloric, phosphoric, oxalic, tartaric or citric acid, to give the corresponding salts.
|
