Sylvia A. Farnum

Carbon-13 Nuclear Magnetic Resonance Spectrum of Colchicine

Abstract 13C NMR chemical shifts of tropolone, tropolone methyl ether and colchicine are reported. The various carbon resonances have been assigned on the basis of substituent effects on benzene shifts, intensities, multiplicities generated in SFORD spectra and the comparison with structurally related compounds like tropolone and tropolone methyl ether.

Low-rank coal slurries for gasification

Abstract An experimental study compared alternate methods for thermal dewatering three low-rank coals from the Western United States. The dewatered coal products were characterized chemically and physically, and their rheological behavior was determined in the form of a coal/water slurry. All coals whose temperature reached 270°C or above exhibited improved “slurryability” as compared to the original (as-received) coal. Raw coals dried with steam and hot water at saturated steam pressure or ion-exchanged (acid leached) coals dried with superheated steam significantly improved the “slurryability” and produced slurries suitable for slurry-fed gasifiers, as determined by their heat content and viscosity.

Carbon-13 Nuclear Magnetic Resonance Spectrum of Quinacrine

Abstract The natural abundance carbon-13 nuclear magnetic resonance spectrum of quinacrine was determined using the pulse Fourier transform technique. The chemical shift of various carbon resonances have been assigned on the basis of the substituent effects on benzene shifts, multiplicities generated in SFORD spectrum and comparison with structurally related compounds.

Fourier Transform 13C NMR Analysis of Biotin

Abstract The natural abundance carbon-13 nuclear magnetic resonance spectrum of biotin was recorded using the pulse Fourier transform technique. The chemical shifts of various carbon resonances have been assigned on the basis of the 13C NMR chemical shift theory, multiplicities observed in SFORD spectrum and comparison with structurally related compounds.

Carbon-13 Nuclear Magnetic Resonance Spectrum of Xylocaine

Abstract The natural abundance carbon-13 nuclear magnetic resonance spectrum of xylocaine was obtained using the pulse Fourier transform technique. The various carbon resonances in the proton noise decoupled spectrum of xylocaine have been assigned on the basis of chemical shift theory, multiplicity observed in SFORD spectrum, signal intensity, relaxation time and comparison with the structurally related compounds.