APPLICATION OF 2-DIMENSIONAL NMR TO THE STRUCTURE DETERMINATION OF ANUNSYMMETRICAL MONOSUBSTITUTED BISPORPHYRIN

The complete assignment of H-1 and C-13 data of an unsymmetrical monos ubstitute bisporphyrin based on an extensive application of two-dimens ional H-1-H-1, H-1-C-13 and C-13-C-13 shift spectroscopy is described. The H-1-H-1 shift correlation through dipolar interaction (2D NOESY) was essential to prove the connection of the alkyl fragments and to di stinguish protons spatially close but belonging to different units. Th e additive structural increments method allowed the assignment of the quatenary carbons of tolyl residues.