
%0 Journal Article
%A Clezy, PS 
%A Liepa, AJ 
%T The chemistry of pyrrolic compounds. XVI. &#946;-Electronegatively substituted dipyrrylmethines
%J Australian Journal of Chemistry
%D 1971/09/01
%V 24
%N 9
%P 1933-1948
%K 
%R https://doi.org/10.1071/CH9711933
%U https://www.publish.csiro.au/paper/CH9711933 
%X The chemistry of dipyrrylmethines bearing &#946;-electronegative substituents is reported. The presence of these electrophilic groups makes the preparation of &#945;-bromomethyl derivatives difficult and this imposes certain limitations on the type of porphyrin which can be prepared by way of these intermediates. Acetyl groups located in the 3- position readily cyclize with one of the pyrrolic nitrogen atoms to give the tricyclic pyrroloindolizine system. 
