The enantioselective synthesis of fully benzenoid single and double carbo[6]helicenes has been achieved via the gold‐catalyzed intramolecular hydroarylation. The single crystal of the racemic double carbo[6]helicene consists of unique layer structures like timbers with halving joints in the woodworking. Furthermore, the double carbo[6]helicenes exhibited relatively large CPL activities among chiral small organic molecules on page 5434 ff.
It has been established that reductive complexation of functionalized benzofulvenes, which are readily prepared from commercially available indene and 2‐methylindene, with RhCl3 in ethanol affords the corresponding indenyl–rhodium(III) dichlorides bearing substituents at the 1‐ (H or CO2Et), 2‐ (H or Me), and 3‐ [CH2Ph or CH2(2‐MeOC6H4)] positions. The indenyl–rhodium(III) complexes bearing one ethoxycarbonyl group showed higher thermal stability and regioselectivity than our previously reported CpERhIII complex toward the oxidative [3+2] annulation of acetanilides with internal alkynes.
The enantioselective synthesis of distorted chiral triptycenes, consisting of three distinct aromatic rings, has been achieved with high ee value. This Frontispiece used “Mitsudomoe (three comma‐shaped figures in a circle, one of the traditional Japanese patterns)”, there are two types of which left‐ and right‐handed, to image the selective synthesis of one enantiomer of the chiral triptycene. Besides, this Mitsudomoe pattern, which is composed of three different collars, associates that this chiral triptycene has three different aromatic rings derived from three components of diyne, 6‐methoxy‐1,2‐dihydronaphthalene, and 1,4‐naphthoquinone. For more details, see the Communcation by K. Tanaka and co‐workers on page 3004 ff.
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