Proton and "C line widths and spin-lattice relaxation times, TI, have been measured for liquid and solid 2,2-dichloropropane (1) and 2,2-dibromopropane (2). Molecular self-diffusion, with activation energies in the range 18-24 kJ mol-', is responsible for the considerable line narrowing observed for
Proton and carbon-13 NMR studies of 2-aminothiazoles and 2-iminothiazolines
β Scribed by C. K. Tseng
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 325 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0749-1581
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π SIMILAR VOLUMES
H and 13C NMR chemical shifts of a series of 1 -substituted pyridinium salts were measured in dimethyl sulfoxide. The effect of the quaternary pyridinium ring on the resonance of the methylene group of the substituent is reported. Increments of 6'H = 3.89 f 0.1 6 ppm and 6' 3C = 47.5 f 3.7 ppm are e
The =C NMR spectra of oxazolopyridine systems are discussed, and a simple method for distinguishing between 2-methyloxazolo- and3-metbylisoxazolo-pyridines is suggested, b e d on the & m i d shift of the methyl group. The effect of the 2-methyloxazole fusion on the pyridine ring is comparable to tha