Deuterium isotope effects on proton chemical shifts in benzenes
β Scribed by Grover M Ford; Larry G Robinson; George B Savitsky
- Publisher
- Elsevier Science
- Year
- 1971
- Weight
- 292 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0022-2364
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π SIMILAR VOLUMES
The deuterium isotope effects on the "Si chemical shifts in several organosilanes and siloxanes have been determined. For silanes, the one-bond effects are approximately -0.2ppm per deuterium and follow an additivity relationship. The two-bond effect is small.
Large deuterium isotope effects on "0 resonances were observed for six common NMR solvents. Only in the case of acetone did the substitution of deuterium for hydrogen result in a downfield shift. The H/D isotope effect was also detected in a study of the reversible hydration of CH,CHO.
Over 100 isotope effects on "C chemical shifts were determined in a series of deuteriated cis-stilbene isotopomers. The magnitude and sign of these effects depend on the position and the number of deuterium atoms in the molecule. The variations in two-and three-bond effects were rationalized by ste