Functional group analysis in coal and on coal surfaces by NMR spectroscopy [electronic resource].
- Washington, D.C. : United States. Office of Fossil Energy, 1990.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: (12 pages) : digital, PDF file
- Additional Creators:
- Ames Laboratory
United States. Office of Fossil Energy
United States. Department of Energy. Office of Scientific and Technical Information
- An accurate knowledge of the oxygen-bearing labile hydrogen functional groups (e.g., carboxylic acids, phenols and alcohols) in coal is required for today's increasingly sophisticated coal cleaning and beneficiation processes. Phospholanes (compounds having the general structure -POCH₂CH₂O (1)) are being investigated as reagents for the tagging of liable hydrogen functional groups in coal materials with the NMR-active ³¹P nucleus. Of twelve such reagents investigated so far, 2 (2-chloro-1,3-dioxaphospholane, ClPOCH₂CH₂O) and 8 (2-chloro-1,3-dithiaphospholane, ClPSCH₂CH₂S) have been found to be useful in identifying and quantitating, by ³¹P NMR spectroscopy, labile hydrogen functional groups in an Illinois No. 6 coal condensate. Reagent 2 has also been used to quantitate moisture in pyridine extracts of Argonne Premium Coal Samples. Preliminary ¹¹⁹Sn NMR spectroscopic results on model compounds with the new reagent CF₃C(O)NHSnMe₃ (N-trimethylstannyltrifluoroacetamide, 14) suggest that labile hydrogen functional groups in coal materials may be more precisely identified with 14 than with phospholanes. 14 refs., 2 figs., 2 tabs.
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