Substituent Effects on the Carbon-13 NMR Chemical Shifts of Cyclopropyl Carbons in<i>p</i>-Substituted(<i>cis</i>- and<i>trans</i>-2-Chlorocyclopropyl)benzenes
Carbon-13chemicalshifts have been measured for the cyclopropyl carbon atoms of twenty one p- substituted (cis- and trans-2-chlorocyclopropyl)benzenes. The substituent induced chemicalshifts (SCS) for the trans derivatives are shifted down field by electron-acceptor substituents and upfield by electron-donating substituents (normal SCS). This SCS trend is the same as those observed for the p-substituted
The solvolysis rates of p-(cis- or trans-2-substituted cyclopropyl)-α-methylbenzyl chlorides including electron-donating and electron-attracting substituents relative to a hydrogen substituent were measured in 80% aqueous acetone. The trans isomers were more reactive than the corresponding cis derivatives where cyclopropyl and phenyl groups could not get a most favorable “bisected” conformation for