
TY  - JOUR
A1  - Clezy, PS 
A1  - Fookes, CJR 
A1  - Prashar, JK 
T1  - The Chemistry of Pyrrolic Compounds. LXI. Petroporphyrins From the Julia Creek Oil Shale: Further Evidence for the Derivation of Etiotype Petroporphyrins From Chlorophyll
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1989
VL  - 42
IS  - 6
SP  - 775
EP  - 786
KW  - 
UR  - https://doi.org/10.1071/CH9890775 
N2  - The synthesis of the porphyrins (2c-j) has been achieved by the oxidative cyclization of appropriately substituted biladienes-ac. The availability of authentic material has allowed the finalization of the structure of a series of aetiotype fossil porphyrins which vary in substitution pattern at positions 3 and 13. All combinations of H, Me and Et at these positions have now been isolated from natural sources. This points to a common precursor, possibly a divinylporphyrin, and strengthens the belief that the chlorophylls are the prime source of the petroporphyrins. A vinyl group, or a close derivative, is found at position 3 of all chlorophylls while fragmentation of the ubiquitous isocyclic ring of the chlorophylls could yield the vinyl group at position 13. 
ER  -

