20189-42-8Relevant articles and documents
PETROPORPHYRINS-III. CHARACTERISATION OF A C32 AETIOPORPHYRIN FROM GILSONITE AS THE BISMERCURY(II) COMPLEX. ORIGIN AND SIGNIFICANCE
Quirke, J. Martin E.,Maxwell, James R.
, p. 3453 - 3458 (1980)
A C32 aetio porphyrin isolated from Gilsonite bitumen (ca. 60 million yr) was assigned unambiguously as aetioporphyrin-III by 1H NMR analysis of its bismercury(II) complex and by comparison with an authentic sample.The occurrence of this compound provides the first direct evidence that the petroporphyrins of Gilsonite are the product of reductive degradation of naturally-occurring chlorophylls, and conversion of the chlorin to the porphyrin system.
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Brockmann Jr.,Knobloch
, p. 267 (1970)
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Comprehensive determination of chlorophyll derivatives by chromic acid oxidation
Satoh, Yuhi,Nomoto, Shinya,Hama, Takeo
, p. 571 - 573 (2012)
It is difficult to measure the total amount of chlorophyll derivatives due to their variety. We applied a new method for comprehensive determination of all derivatives by ethylmethylmaleimide (EMMi) derived from chlorin which is a ring structure of chloropigments. Relationships between the amount of applied chloropigments and the yield of EMMi through the chromic acid oxidation were examined for three species of chloropigments. The yield of EMMi from chloropigments was almost constant regardless of the amount or pigment species, indicating the applicability of this method for comprehensive deterimination of chlorophyll derivatives.
Preparation method of 2-methyl-3-ethyl maleic amide
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Page/Page column 0080-0081; 0092-093; 0104-105; 0116-0117; 0128, (2017/08/29)
The invention relates to a preparation method of 2-methyl-3-ethyl maleic amide. The method comprises the following steps: preparing dimethyl maleic anhydride; preparing 2-methyl-3-ethyl maleic anhydride; and preparing 2-methyl-3-ethyl maleic amide. A process route develops a synthetic method of a series of maleimide and maleic anhydride, and meanwhile, a flavoring application experiment is performed on the series of precursor-aroma compounds, thereby providing an important support for developing novel perfume materials.
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 (2007/10/03)
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