
%0 Journal Article
%A Chakraborty, S 
%A Clezy, PS 
%A Sternhell, S 
%A van, Thuc L 
%T The chemistry of pyrrolic compounds. LII. The preferred pathway of electron delocalization in metalloporphyrins
%J Australian Journal of Chemistry
%D 1982/11/01
%V 35
%N 11
%P 2315-2323
%K 
%R https://doi.org/10.1071/CH9822315
%U https://www.publish.csiro.au/paper/CH9822315 
%X Measurement of the proton coupling constant in the allylic unit, CH3-C=C-H, of the zinc(II), nickel(II) and magnesium(II) chelates of the deuteroporphyrin isomer (3a) points in each case to the double bond of this system having a significantly diminished bond order. Similar data have been obtained for the dication derivative of (3a). These findings are in accord with the view that the &#960;-electron delocalization pathway in porphyrin dications and metalloporphyrins involves the periphery of the molecule as was previously shown for the metal-free porphyrin. New synthetic approaches to the porphyrin (3a) have been studied. 
