Synthesis of Methyl Azulen[1,2-b]azulene-2-carboxyl ate and Dimethyl Azulen[1,2-b]azulene-2,4-dicarboxylate

Abstract
The titled compounds were synthesized. The complete assignment of 1H-NMR spectrum of methyl azulen[1,2-b]azulene-2-carboxylate and the rearrangement of ester group on seven membered ring in the dehydrogenation reaction are described.