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Updated: Jun 10, 2025
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Thieno[3,2-b]thiophene Incorporated Redox Active 22π and 34π Core-Modified Expanded Isophlorinoids
Hosahalli S Udaya1, Venkataramanarao G Anand1
1Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Maharashtra, 411008, India.
Abstract:
Incorporation of a thieno[3,2-b]thiophene into an isophlorinoid-like framework alters the aromaticity by extending the macrocyclic π-circuit. Their opto-electronic and aromatic properties significantly differ from other 22π and 34π porphyrinoids. Among the three different 34π hexaphyrins, furan based hexaphyrin adopts a non-aromatic 'figure-of-eight' conformation. Replacing all the furans either by thiophene or selenophene induces a planar conformation with aromatic characteristics. Spectro-electrochemical studies revealed reversible two-electron ring oxidation to yield their 4nπ dicationic species respectively.
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