๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Secondary isotope effects and mass-sensitive amplitudes of vibration

โœ Scribed by L.S. Bartell

Book ID
104249784
Publisher
Elsevier Science
Year
1960
Tongue
French
Weight
195 KB
Volume
1
Category
Article
ISSN
0040-4039

No coin nor oath required. For personal study only.

โœฆ Synopsis

In recent years eecondmy isotope effects in reactions involving oarboaium ion transition states have been explored intensively by Lewis, Shiner, ami other*.* The retavdation [email protected] deuterium substitution at8 oarbonsls aluostunlversallyattributedto a hyperconjugative weakening of C-H or C-D bonds on the /) carbon atoms. The retardation associated with ~substdtutlon, on the other hand, is ackvmuledged to be eutlrely unrelated to hyperconjugation, and hence unrelated to the (3 effect. It is the purpose of this communication to point out a factor, heretofore neglected, which seem to account for a substantial part of the t3 effect without requiring that C-H bonds be weakened in the transition state. Further, it bridges the gap between the a and (, effects as it can be shown, iuthe~~effeot, to reduce essentiallyto the aocepted [email protected] of Streituieser et al 3 _-*

๐Ÿ“œ SIMILAR VOLUMES

Secondary isotope effects in the mass sp
Secondary isotope effects in the mass spectra of C2D5OC2H5 and CD3CH2OC2H5
โœ Morley E. Russell ๐Ÿ“‚ Article ๐Ÿ“… 1993 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 248 KB

Secondary isotope effects were examined in the loss of methyl from the molecular ions of C,D,OC,H, and CD,CH,OC,H, for ion source processes and collisional activation (CA) processes. In the ion source loss of CH, was slightly favored over loss of CD, , but in CA the CH, loss was favored to a much la