π‐Extension of the Tribenzotriquinacene Framework: Efficient Vinylene and Arylene Bay Bridging Based on a New C₃‐Symmetric Key Derivative

Abstract

1,5,9‐Tribromo‐2,3,6,7,10,11‐hexamethoxy‐4b1‐methyltribenzotriquinacene, a C3‐symmetric TBTQ derivative, can be prepared conveniently and with high regioselectivity from readily available starting materials. It is a versatile key compound for the synthesis of other chiral 1,5,9‐trifunctionalized TBTQ derivatives and π‐extended congeners in which the bays of the TBTQ skeleton are bridged by vinylene and 1,2‐arylene units. X‐ray crystal structure analysis and UV‐vis spectroscopy show that vinylene bay‐bridging enables better π‐conjugation with the arene rings of the TBTQ core than 1,2‐arylene bay‐bridging does.