CIDNP effects in various magnetic fields during the reaction of substituted benzyl chlorides with n‐butyllithium

We detected and studied CIDNP effects in the reaction of substituted benzyl chlorides with n‐butyllithium in hexane (Scheme 1) in various magnetic fields (from 0·5 Oe to about 25,000 Oe). The polarisation of 19F nuclei in the reaction of p‐F‐benzyl chloride in strong fields has been observed by Rakshys.1 We succeeded, however, in finding the CIDNP effects for both 19F and 1H in all the reactions investigated. The CIDNP effects observed offer a number of remarkable features; therefore, a detailed analysis of these effects can be useful for a better understanding of the nature of CIDNP.