7-[(3,5-Di-tert-butyl-2-hydroxybenzylidene)amino]-4-methyl-2H-chromen-2-one

Abstract

The title compound, C25H29NO3, is a Schiff base derivative of coumarin 120. There are two structurally similar but crystallographically independent molecules in the asymmetric unit. Both molecules exist in E configurations with respect to the C=N double bonds. The dihedral angles between the coumarin and 3,5-di-tert-butyl-2-hydroxybenzylidene ring planes are 4.62 (7) and 14.62 (7)degrees for the two molecules. Intramolecular O-H center dot center dot center dot N hydrogen bonding involving the O-H groups and the azomethine N atoms generate S(6) rings. In the crystal structure, independent molecules are linked by C-H center dot center dot center dot pi interactions, with groups of four molecules stacked along the c axis.