## Abstract ESR. data are reported for the radical anions (II^β^ to VI^β^) of five alkyl substituted __6aβthiathiophthenes__. Rates and activation parameters for the inversion of the 3,4βtrimethylene chain in IV^β^, V^β^ and VI^β^ have been obtained by means of an iterative least squares computer p
A comparative study of some oxygen and sulphur substituted alkyl radicals
β Scribed by I. Biddles; A. Hudson; J.T. Wiffen
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- French
- Weight
- 474 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0040-4020
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## Abstract NMR shifts for a large number of fatty epoxy, hydroxy, keto, epithio, carboxymethylthio, cis and trans ethylenic, acetylenic, bromo and chloro compounds are recorded and discussed. A 3βtrans monoene present in aster seed oil could be identified. Cis and trans epoxy acids show different
The structures of a-X-cyclopropyl and a-X-isopropyl radicals (X = H, CH3, NH2, OH, F, CN, and NC) are reported at the RHF 3-21G level of theory. The isopropyl radicals are pyramidal with out-of-plane angles varying from 12" (X = CN) to 39" (X = NH2), and barriers to inversion ranging from 0.4 kcal/m
Ab initio SCF caktitions have been performed to invest&&e the structural and electronic features ot the mxerations of H\* and fi\* with the oxygen bases HzCO and OH-. The data indicate that the a--H interactions aTe prima.riIy covrdent while the Li-0 interactions are primxify eIectrostatic, although