Macrospirocyclic oligomers based on carbazole and fluorene

Org Lett. 2011 Jan 21;13(2):200-3. doi: 10.1021/ol1025958. Epub 2010 Dec 14.

Abstract

Monodisperse macrospirocyclic oligomers were prepared using self-condensation of the Friedel-Crafts reaction. Through the C-9s of the central fluorene units of four surrounding oligofluorenes, four carbazole units are connected in a series to form a macrocyclic core. These rodlike oligofluorenes form a rigid three-dimensional structure, affording the resulting macrocyclics a high steric hindrance for close interchain packing.