Abstract: In this paper, the effect of various substituents on ¹H and ¹³C NMR chemical shift in some a-naphthyl derivatives has been investigated. We discovered that the ranges of the ¹H and ¹³C NMR chemical shift for each position are changed with the different values of substituent electronegativities E_y^x and substituent constants σ.Thus the relationship between the chemical shift and substituent electronegativity and substituent constant has been discussed.
The experimental results show that the bonding states and structures of naphtyl derivatives may be identified by measuring the ¹H and ¹³C NMR chemical shift and the substituent behavior as well.