In the ABX nmr spectra of amphetamines and related compounds, a problem arises in the assignment of individual A and B protons since usually there is no a priori reason to assign one "quartet" to one or the other of the diastereotopic protons. (Suggestions have been made, however, that the A proton
An NMR study of the diastereotopic nature of fluorine atoms and protons using Eu(fod)3
β Scribed by T. Ya. Lavrenyuk; Yu. P. Egorov; E. A. Pomanenko; V. A. Shokol; Yu. A. Paliichuk
- Book ID
- 112357506
- Publisher
- Springer
- Year
- 1979
- Tongue
- English
- Weight
- 190 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0040-5760
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## Abstract The isomeric tricyclo[4.4.1.1^2,5^]dodecanβ11βols have been synthesized from the (6+4) cycloaddition product of tropone with cyclopentadiene. The configuration and conformation of each isomer was determined from the proton shift gradients induced in the olefinic proton signals in the ^1
The total atomization energy and proton affinity of NH3 have been subjected to an extensive convergence study involving basis sets of up to spdfgh quality. Our best extrapolated ~ Do = 276.5 kcal/mol lies only 0.2 kcal/mol below the experimental value. Our recommended value for PA298, 203.9-t-0.3 kc