π-Conjugated macrocycles from thiophenes and benzenes
作者:J. Sreedhar Reddy、Venkataramanarao G. Anand
DOI:10.1039/b715553k
日期:——
Ï-Conjugated macrocycles consisting of thiophenes and benzenes exhibit benzenoid features for 4nÏ macrocycles, whereas (4n + 2)Ï macrocycles are annulenoid due to rapid interconversion between quinoid and Kekule canonical forms in the benzene units.
Topological Diversity in Electrochemically Active Core-Modified Expanded Porphyrinoids
作者:Hosahalli S. Udaya、Vishnu Mishra、Tullimilli Y. Gopalakrishna、Venkataramanarao G. Anand
DOI:10.1021/acs.orglett.3c02328
日期:2023.9.15
conformation to a twisted conformation upon a systematic increase in the number of thiophene units. Octaphyrin, with 40π electrons, displayed temperature-dependent interconversion between planar and nonplanar conformations in the solution state, in contrast to the rigid planar conformation in the solid state. 60π-dodecaphyrin and 70π-tetradecaphyrin have the maximum number of π-electrons for 12- and 14-heterocycle
Aromatic Expanded Isophlorins: Stable 30π Annulene Analogues with Diverse Structural Features
作者:J. Sreedhar Reddy、Venkataramanarao G. Anand
DOI:10.1021/ja906290d
日期:2009.10.28
until date. In contrast to the parent isophlorin 2, expanded isophlorins 7-9 and 11-13 are aromatic (4n + 2)pi systems and also differ in their optical properties and structural features. They exhibit ring inverted structures and the number of ring inversions is dependent on the nature of the heteroatoms present in the core of the macrocycle. This was confirmed by both (1)H NMR spectroscopy and single crystal-ray