Cover Feature: Synthesis of Distorted 1, 8, 13‐Trisilyl‐9‐hydroxytriptycenes by Triple Cycloaddition of Ynolates to 3‐Silylbenzynes (Chem. Eur. J. 61/2019). Issue 61 (24th September 2019) - Yoshinaga, Tatsuro
Abstract : Distorted triptycenes : 1, 8, 13‐Trialkyl (aryl)silyl‐9‐hydroxytriptycenes (trisilyltriptycenes) were synthesized by the triple addition of ynolates and 3‐silylbenzynes with high regioselectivity. Benzene rings in the resulting triptycenes were highly distorted where the dihedral angles between the substituents were as high as 35°. The distortion energy induced step‐by‐step halogenation reactions to yield halogenated triptycenes, including chiral triptycenes. The 1, 8, 13‐trihalogenated triptycenes were then converted to 1, 8, 13‐functionalized triptycenes. More information can be found in the Communication by M. Shindo et al. on page 13855 .