Nuclear Quadrupole Resonance and Stereochemistry II. Vicinal cis- and trans-dichloro derivatives of carbocyclic systems

The ³⁵Cl quadrupole resonance frequencies of sets of isomeric vicinal dichloro derivatives of carbocyclic molecules are presented. In all cases except one – cis- and trans-1, 2-dichloro-acenaphthene – the configuration has only a small effect on the resonance frequency. This implies that the frequency-differences in cyclic α-chloroethers reported in Part I of this series 1] are indeed due to a specific interaction with the oxygen atom. The difference between the acenaphthenes may be due to hyperconjugation between the C? Cl bond and the aromatic system.