In the last 20 years stable carbenes[1] have found numerous applications. They are excellent ancillary ligands for transition metal catalysts,[2] as exemplified by the state of the art ruthenium-based olefin metathesis catalysts.[3] Moreover, they coordinate main group elements in their zero oxidation state,[4] stabilize highly reactive species,[5] activate small molecules,[6] and act as effici...

The ability of cyclooctatetraene oxide to undergo two sequential ring contraction events under mild conditions, using Brønsted acid catalysis, has been studied in detail. We have found that the selectivity can be controlled by acidity catalyst and temperature, being able obtain selectively either cycloheptatriene carbaldehyde product, arising from a single ring-contraction event, or phenylaceta...

Substance containing two ?-congested aromatic systems are attractive targets in synthetic studies as well efforts designed to explore the unique properties that originate from ?-congestion. Since time of computational by Schleyer and Warner, concept stacked aromaticity created encounter antiaromatic rings has received much attention. A structure ?-congestion between norcorrole was prepared Shin...

M06-2X functional was employed to study halogen-π interactions in X-C2-Y…C8H8 complexes (X, Y=H, F, Cl, and Br). In fact, interactions of mono- or di-halogenated acetylenes and planar cyclooctatetraene as an anti-aromatic π system were considered. Relationship between binding energies of the complexes and charge transfer effects was investigated. Also, electronic charge density values were calc...