
%0 Journal Article
%A Calder, IC 
%A Sasse, WHF 
%T Aromatic nitrogen bridgehead compounds. II. The synthesis of 1-Acylmethyl-2-(2-pyridyl)pyridinium salts and their cyclization to 6-substituted Dipyrido[1,2-c:2',1'-e]imidazolium salts
%J Australian Journal of Chemistry
%D 1968/04/01
%V 21
%N 4
%P 1023-1036
%K 
%R https://doi.org/10.1071/CH9681023
%U https://www.publish.csiro.au/paper/CH9681023 
%X The interaction of 2,2'-bipyridyl, 4,4'-dimethyl-2,2'-bipyridyl, 5,5'-dimethyl- 2,2'-bipyridyl, or l,l0-phenanthroline with aromatic or aliphatic &#945;-haloketones, or with ethyl bromoacetate, gives high yields of 1-acylmethyl-2-(pyridyl)pyridinium salts. These salts can be converted in good yields into 6-substituted dipyrido-[1,2-c:2',1?-e]imidazolium salts by treatment with either bromine and pyridine or p-toluenesulphonyl chloride and pyridine. The mechanisms of these cyclizations are considered. 
