N-methylated 2,3'-bipyridinium ion. First synthesis of the more sterically hindered isomer
摘要:
1-Methyl-2,3'-bipyridinium salts can be prepared by deprotection of diquaternized precursors. Protecting groups are eliminated from the 1'-position under basic conditions; they include either p-nitrostyrene or 1-methyl-2-vinylpyridinium ion. In DMSO-d6-CD3OD a nucleophile adds to 1,1'-dimethyl-2,3'-bipyridinium ion to generate a sigma-complex having a nucleophile bonded to the 6'-position.