الفهرس 
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Abstract
This thesis includes three chapters: The first one covers the literature concerning the structure, hybridiza- tion and evidences for the conjugation of the cyclopropyl group with an adjacent cation center.
tuent
substi-
A review of the correlation of Hammett-type constants with the 13C NMR shifts of the cationic
carbon for stable carbocations is also included.
The use of NMR isotope shifts as a probe of carboca- tion structure was also discussed.
The second chapter is divided into two main parts.
The first part describes 13C NMR chemical and deuterium isotope shifts for derivatives of 1-aryl-1- cyclopropyl- ethyl cations 22a-i and 1-aryl-1-hydroxyethyl cations 23a-i.