Abstract
Several Schiff bases containing a hydroxy naphthyl moiety and substituted pyridyl groups were synthesized. The pyridyl substituted Schiff bases were isolated as a single stable tautomer at room temperature. High-resolution proton and carbon NMR spectroscopy showed that these compounds exist as keto tautomers. The Schiff bases showed extraordinary stability and did not convert to the enol tautomer, even at high temperatures. Most of the compounds exhibited thermochromic properties.
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