An Infra-red spectroscopic study of naphthalene substitution

Abstract

Infra-red spectroscopic data on a number of mono- and disubstituted naphthalene derivatives have been obtained in the range 670-900 cm-l, in order to test the validity of the substitution rules based upon the hydrogen bending vibrations in this region and the number of adjacent hydrogen atoms in the molecules. It was found that the rules based on benzene substitution are generally valid for groups of two, three, or four hydrogen atoms in the naphthalene nucleus, although substituents which interact with the ring tend to widen the limits within which a band may be expected to fall. In the case of a single hydrogen atom the relevant bands are often weaker and their position variable.