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45.24 Product Class 24: Pentalenes, s-Indacenes, as-Indacenes, Azulenes, and Heptalenes, and Their Benzo Derivatives

DOI: 10.1055/sos-SD-045-01121

Abou-Hadeed, K.; Hansen, H.-J.Science of Synthesis, (2010451043.

General Introduction

Among this group of compounds, pentalene (1), s-indacene (2), as-indacene (3), and heptalene (5) all contain even numbers of π-bonds (4n π-electrons), whereas azulene (4) has an odd number of π-bonds ([4n+2] π-electrons) (Scheme 1).

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