The redistribution of charge in naphthalene caused by methyl substitution

Abstract
The proton resonance spectra at 40 Mc/s of solutions of symmetrically substituted dimethylnaphthalenes in carbon disulphide have been measured and interpreted. Methyl substitution causes changes of the chemical shifts of the various ring protons, which are discussed in terms of the inductive effect of the methyl group. It is shown that a correlation exists between the variations of these chemical shifts and the partial rate factors for H-D exchange.