Influences of polarizability effect of alkyl group and homoring competition effect of substituents on the NMR spectra of salen-type Schiff base.

Salen-type Schiff bases are a kind of important compounds and are widely used. In order to explore the effect of alkyl groups and substituents attached to aromatic ring on the chemical shifts, 63 title compounds were synthesized. Their H NMR and C NMR spectra were obtained; and the effects of the alkyl chain length and substituents on the chemical shifts (δ (CHN), δ (CHN), δ (OH), and δ (COH)) were studied.