Synthesis of Tri- and Disalicylaldehydes and Their Chiral Schiff Base Compounds

Abstract

A suitable procedure for convenient preparation of 1,3,5-tris(4-hydroxy-5-formylphenyl)benzene (6) was exploited via 5-bromosalicylaldehyde as starting reactant. Among the obtained products, compound 6, 4-methoxy-3-formylphenylboronic acid (9), 1,3,5-tris(4-methoxy-5-formylphenyl)benzene (10), and 4-methoxy-4′-hydroxyl-3,3′-diformyl-1,1′-diphenyl (11) had not been reported previously. Two new chiral Schiff base ligands, L1 and L2, were obtained from the tri- or disalicylaldehydes.

Keywords:

• 5-Bromosalicylaldehyde
• disalicylaldehyde
• Schiff base ligands
• trisalicylaldehyde

ACKNOWLEDGMENTS

We are grateful to the Chinese National Natural Science Foundation (Grant Nos. 20471013 and 20633020), the Swedish Energy Agency, the Swedish Research Council, and the K&A Wallenberg Foundation for financial support of this work.