Abstract
Helicenes are a class of helically condensed polycyclic aromatic compounds, which are characterized by the rigid helicity and high optical stability, Since the first synthesis and optical resolution of [6] helicene by Newman and Lednicer in 1955, the chemistry of helicenes has attracted continuing attention because of their unique structural features and high rotational values. The purpose of this article is to make a survey of the development and present situation of helicene chemistry, emphasis being placed on the synthetic aspects, optical resolution and reactions of helicenes and heterohelicenes. Also included are some of helicene analogues such as double helicenes, bihelicenes, propelicenes and circulenes.
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