Abstract
A RECENT paper1 has discussed the distribution of different types of nitrogen compounds in the 200°–500° C fraction from petroleums of varying geological age. Carbazoles and benzcarbazoles were found to be predominant nitrogen types in all crudes, accounting for 25–70 per cent of total nitrogen in this boiling range, and as much as 2 per cent by weight of the 200°–500°C fraction. Carbazoles and their higher benz analogues also appear to account for a major part of the nitrogen in the 500°C plus residues from these crudes. Among the benzcarbazoles the 1,2-isomers predominate, the 3,4-benzcarbazoles are present in minor amounts, and the 2,3-benzcarbazoles are altogether absent. A similar distribution has been noted in catalytically cracked gas oils2.
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References
Snyder, L. R., and Buell, B. E., submitted for publication in Analyt. Chem.
Snyder, L. R., and Buell, B. E., Anal. Chem., 36, 767 (1964).
Sumpter, W. C., and Miller, F. M., in The Chemistry of Heterocyclic Compounds. Heterocyclic Compounds with Indole and Carbazole Systems, edit. by Weissberger, A. (Interscience, New York, 1954).
Biemann, K., Mass Spectrometry. Organic Chemical Applications (McGraw-Hill, New York, 1962).
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SNYDER, L. Distribution of Benzcarbazole Isomers in Petroleum as Evidence for their Biogenic Origin. Nature 205, 277 (1965). https://doi.org/10.1038/205277a0
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DOI: https://doi.org/10.1038/205277a0
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