17825-86-4Relevant academic research and scientific papers
A new maturity indicator of sedimentary organic matter based on thermal fission of allylic bond in porphyrins
Nomoto, Shinya,Kozono, Masaki,Mita, Hajime,Shimoyama, Akira
, p. 1174 - 1175 (2001)
A 3-ethyl-4-methylpyrrole unit in etioporphyrin was shown to be converted to a 3,4-dimethylpyrrole unit by the action of heat, which was proved to be catalyzed by Na-montmorillonite. Time courses of the reaction could be followed by analyzing 2-ethyl-3-me
The first experimental demonstration of side chain extension of geoporphyrins in sediments
Asahina, Kenta,Asano, Junya,Kumagai, Gen,Satou, Mitsuru,Nomoto, Kouichi,Kashiyama, Yuichiro,Mita, Hajime,Nomoto, Shinya
body text, p. 1267 - 1269 (2011/02/16)
To investigate the formation process of high carbon number (>C 32) sedimentary porphyrins, heating experiments of several porphyrins were performed. Chromic acid oxidation of the heating products of protoporphyrin IX dimethyl ester afforded 2-methyl-3-npropylmaleimide as the predominant product among the side-chain extension products formed. On the other hand, saturated substituents of etioporphyrin were also extended on heating to slowly form normal and branched homologs. These results may suggest that the transalkylation of porphyrin side chains proceeds mainly by a regioselective mechanism involving alkyl radical addition to a vinyl group of chlorophylls or their diagenetic products.
Fragmentation of Nitro Derivatives of Pyrrole Pigments and its Relationship to the Gmelin Reaction
Ribo, Josep,Trull, Francesc
, p. 1 - 7 (2007/10/02)
The 5-(arylnitromethylene)-3-pyrrolin-2-ones 1-5, the 5-nitrobilin-1,19-diones 7,8, and the 5-nitropyrromethenone 6 are shown to decompose in acidic media to yield maleimides according to fragmentation reactions of nitronic acids.This fragmentation reacti
