elevating control of emitter heating current ranging at least from 6 to 12 mA was found to be essential. In conclusion, a combination of emitter heating current control and the accumulation of ions on a photographic plate or through a computer will be indispensable in the measurement of mixtures. Th
Correlation between oil yields of oil shales and 13C nuclear magnetic resonance spectra
β Scribed by Gary E. Maciel; Victor J. Bartuska; Francis P. Miknis
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 233 KB
- Volume
- 57
- Category
- Article
- ISSN
- 0016-2361
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## Abstract The ^13^C NMR spectra of several diterpenic derivatives having the podocarpane and cassane skeleton were recorded and interpreted. The most significant effects due to substituent orientation, B/C ring junction stereochemistry and conformational changes are briefly discussed.
## Abstract The ^13^C and ^19^F (when appropriate) chemical shifts of a variety of diβ, triβ and tetrasubstituted methanes of the type CH~2~XCOOEt (I), CHXYCOOEt (II) and CXYZCOOEt (III), where the substituents X, Y and Z are F, Br, OEt, OPh, SEt, SPh and NO~2~, were determined. The prediction of t