35188-29-5Relevant academic research and scientific papers
13C- and 1H-NMR Shielding Effects in Aliphatic gauche/trans Fragments
Schneider, Hans-Joerg,Buchheit, Ulrich,Hoppen, Volker,Schmidt, Guenther
, p. 321 - 326 (2007/10/02)
On the basis of improved calculation models, of new NMR measurements with bicycloheptyl and cyclohexyl compounds, and of literature data it is shown that classical mechanisms of sterically induces charge polarizations, of linear electric field, and
Carbon-13 magnetic resonance: hydrogen involvement in γ-anti substituent effects
Forrest, T. P.,Thiel, J.
, p. 2870 - 2875 (2007/10/02)
Chemical shifts have been determined for the carbons in a series of 3,3-dimethylcyclohexyl derivatives, (substituent = H, CH3, NH2, OH, Cl, Br, I).Comparison of the γ-anti substituent effects at carbons 3 and 5 indicates that presence of axial protons on these carbons causes increased shielding by all of the above substituents.The shielding by γ-anti substituents is decreased by the replacement of either the α or γ protons by methyl groups; the extent of the decrease is dependent upon the substituent and upon the position of the hydrogen which is replaced.
