
TY  - JOUR
A1  - Kelly, DP 
A1  - Spear, RJ 
T1  - Carbon-13 N.M.R. studies of carbocations. Determination of &#963;<sup>+</sup><sub>ortho</sub> constants from <sup>13</sup>C spectra of benzhydryl cations
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1977
VL  - 30
IS  - 9
SP  - 1993
EP  - 2004
KW  - 
UR  - https://doi.org/10.1071/CH9771993 
N2  - Carbon spectra of a range of 2- and 4-substituted benzhydryl cations have been measured in super acid at variable (low) temperatures. In the 4-substituted benzhydryl cations the chemical shift of the para carbon in the unsubstituted ring [&#948;(C4?)] proves to be an excellent probe for changes in charge density at the cationic carbon, as shown by its correlation with &#963;p+ (r 0.990). Measurement of &#948;(C4?) for the 2- substituted benzhydryl cations provides a direct measure of &#963;0+ for side-chain benzene derivatives; these values are OMe -0.59, Me -0.10, F 0.19, Cl 0.26, Br 0.29 and CF3 0.69. 
ER  -

