Synthesis and Spectroscopic Distinction of Benzonaphthonaphthyridine and Its Isomer

Abstract

Distinction of benzo[h]naphtho[1,2-b][1,6]naphthyridine and its isomeric benzo[b]naphtho[1,2-h][1,6]naphthyridine is well explained on the basis of various spectroscopic techniques. Initially these isomers were prepared from their respective chloroquinolines via anilinoquinolines as potential intermediates. Spectroscopic dissimilarities of their precursors and intermediates have also been considered and compared with the final benzonaphthonaphthyridine isomers.

GRAPHICAL ABSTRACT

Keywords:

• Benzo[b]naphtho[1,2-h][1,6]naphthyridine
• benzo[h]naphtho[1,2-b][1,6]naphthyridine
• 4-chloro-2-methylbenzo[h]quinoline
• 4-chloro-2-methylquinoline
• N-(naphthyl)quinolin-4-amine
• N-o-tolylbenzo[h]quinolin-4-amine
• spectral distinction

ACKNOWLEDGMENTS

We acknowledge the Indian Institute of Technology Madras, Chennai, and the Indian Institute of Chemical Technology Hyderabad, India, for their support in spectral studies. K. Kolandaivel, Department of Physics, Bharathiar University, Coimbatore, is also greatly acknowledged for theoretical calculation of geometrical parameters.