Nuclear magnetic resonance of some fluoro-substituted phenyl and benzyl mercurials

Abstract

l9F and lH nuclear magnetic resonance data are reported for the para and meta fluoro-phenyl and -benzyl mercurials of types R2Hg and RHgX where X is a halide. The 19F data for the fluorophenyl mercurials provide no evidence for direct aryl-mercury conjugation, and mercuri substituents exert very feeble electronic effects. The shielding for the fluorobenzyl mercurials suggests a quite pronounced o-p electron donating effect for the metallomethyl group (NCH2-). Some 199Hg-lH spin coupling constants are derived from the proton spectra of the benzyl mercurials.