Figure 2
Synthesis of thiophene-fused heptalenes 6a, 6b, and 7 by the cycloaddition reaction of azulenothiophenes 4a, 4b, and 5 with DMAD; red-numbers show the numbering of ring-carbon.
Figure 2 | Scientific Reports
Synthesis of thiophene-fused heptalenes 6a, 6b, and 7 by the cycloaddition reaction of azulenothiophenes 4a, 4b, and 5 with DMAD; red-numbers show the numbering of ring-carbon.
