Stabilities of carbonium ions in solution. 6. Heats of formation of simple alkyl carbonium ions in sulfuryl chloride fluoride and their relevance to the nonclassical ion question
Kinetics and equilibria of chloride transfer reactions. Stabilities of carbocations based on chloride and hydride transfer equilibria measurements
作者:R. B. Sharma、D. K. Sen Sharma、K. Hiraoka、P. Kebarle
DOI:10.1021/ja00299a001
日期:1985.6
Les cinetiques d'un certain nombre de reactions de transfert de chlorure Ro + +RCl=RoCl+R + (R=isopropyl, cyclopentyl, t-butyl, methyl-1 cyclopentyl, benzyls substitues, norbornyl-2, methyl-2 norbornyl-2 et adamantyl) sont mesurees avec un spectrometre de masse a faisceau electronique pulse a haute pression
Les cinetiques d'un some nombre de反应 de transfert de chlorure Ro + +RCl=RoCl+R + (R=isopropyl, cyclopentyl, t-butyl,methyl-1 cyclopentyl, benzyls substitues, norbornyl-2,methyl-2norbornyl- 2 et adamantyl) Sont mesurees avec unspectrometer de masse a faisceau electronique 脉冲a haute press
Rate of degenerate rearrangement of the 2-methyl-2-norbornyl cation studied by13C selective pulse transfer and two-dimensional NOESY spectroscopy
作者:Peter Baine、Robert L. Domenick、Kenneth L. Servis
DOI:10.1002/mrc.1260251203
日期:1987.12
The rate of the degenerate 6,1‐hydride shift and rearrangement of the 2‐methyl‐2‐norbornyl cation has been determined using selective pulse transfer experiments and 2D NOESY experiments over the temperature range 200–220 K. Least‐squares analysis of the data gives a free energy of activation of 11.3 kcal mol−1. The results are compatible with the presence of σ‐delocalization in the 2‐methyl‐2‐norbornyl
Trimethylsilyl cyanide promoted cyanation of tertiary alkyl chlorides and other SN1 active compounds
作者:Manfred T. Reetz、Ioannis Chatziiosifidis、Hermann Künzer、Hans Müller-Starke
DOI:10.1016/s0040-4020(01)88594-x
日期:1983.1
Tertiary chlorides are readily cyanated in a one-pot procedure using trimethylsilyl cyanide in the presence of SnCl4. The mechanism of this novel and synthetically useful reaction involves initial isonitrile formation followed by rearrangement to the tertiary nitrile. Other SN1 active componds also undergo smooth cyanation.