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A novel method was developed for synthesizing a series of new three dentate   Schiff base ligands starting from hydroxynaphthalidene pyrimidinyl amines   with o-phenylenediamines or o-aminophenol or 2-amino-3-hydroxy-pyri-dine in   the presence of formic acid catalyst under solvent-free conditions. In these   reactions [1+1] condensation product as half-unit ligand was obtained.   Moreover, the reaction of hydroxynaphthalidene pyrimidinyl amines with   3,4-diamino-pyridine and 1,8-naphthalenediamine lead to the formation of   C2-naphthylated imidazopyridine and dihydropyrimidine, respectively. The   attractive features of this protocol are: use of inexpensive catalyst,   operationally simple, short reaction times, easy handling, and good yields

A novel approach toward the synthesis of some new tridentate Schiff bases from anil-like compounds