Abstract
Structural variations of different 2 π-aromatic three-membered ring systems of main group elements, especially group 14 and 13 elements as compared to the classical description of cyclopropenyl cation has been reviewed in this article. The structures of heavier analogues as well as group 13 analogues of cyclopropenyl cation showed an emergence of dramatic structural patterns which do not conform to the general norms of carbon chemistry. Isolobal analogies between the main group fragments have been efficiently used to explain the peculiarities observed in these three-membered ring systems. Structural variations of 2π-aromatic three-membered ring systems of main group elements have been reviewed in this article. The peculiarities observed in these three-membered ring systems have been explained through the concept of isolobal analogy, diagonal relationship and pseudo 2π-aromaticity.
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