Table 2 Redox potentials of heptalenes 6a, 6b, and 7.

From: Synthesis of thiophene-fused heptalenes by cycloaddition of azulenothiophenes with dimethyl acetylenedicarboxylate

Sample

Method

E1OX [V]

E1RED [V]

E2RED [V]

6a

CV

+ 0.90 (Epa)

− 1.84 (Epc)

− 1.23 (Epa)

–

(DPV)

(+ 0.76)

(− 1.77)

–

6b

CV

+ 0.81 (Epa)

− 1.87 (Epc)

− 1.25 (Epa)

–

(DPV)

(+ 0.72)

(+ 1.80)

–

7

CV

+ 0.81 (Epa)

− 1.85 (Epc)

− 1.31 (Epa)

− 2.03 (Epc)

− 1.73 (Epa)

(DPV)

(+ 0.74)

(− 1.76)

(− 1.94)

  1. V versus Ag/AgNO3, 1 mM in benzonitrile containing Et4NClO4 (0.1 M), Pt electrode (internal diameter: 1.6 mm), scan rate = 100 mVs−1 (CV) and 20 mVs−1 (DPV), and external standard Fc/Fc+ =  + 0.15 V. Epc and Epa correspond to the cathodic and anodic peak potentials, respectively.
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