Other
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38.1745c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 38, Issue 12, pp.1745-1758
Other
1
Scientific paper
Crude oils generally contain at least one symmetrical homologous series of porphyrins, which is usually centered at m / e 476 (DPEP) or m / e 478 (etioporphyrin). Simulated geochemical conditions in the present study resulted in decarboxylations and alkylations which ultimately led to the synthesis of homologous porphyrins from a single porphyrin. In several series of closed tube experiments, mesoporphyrin IX dimethylester (MPDME) was mixed with a variety of constituents including benzene, acetic acid, propionic acid, water and clay; the experiments were performed at temperatures between 135°C and 400°C at time intervals up to 80 days. Dealkylation, alkylation, hydrolysis, decarboxylation and metallation products were observed. An unsymmetrical homologous series of porphyrins was produced from MPDME. The dominant mass was m / e 478 (corresponding to a double deoarboxylation). Dealkylation products in multiples of 14 amu below the m / e 478 peak comprised the other members of the series. Cu-MPDME also produced homologous porphyrins. These, however, exhibited symmetry about the dominant members, similar to the symmetry found for the porphyrins of most petroleums and oil shales.
Casagrande Daniel J.
Hodgson Gordon W.
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