Unless otherwise noted, all starting materials, reagents, and solvents were purchased from commercial sources and used without further purification. Melting points were determined using a Thermal Analysis Q20 differential scanning calorimeter at a heating rate of 10 • C/min. NMR spectra were measured for CDCl 3 solutions using Bruker Avance 850, 500, or 400 MHz NMR spectrometers. Dimethyl 4,5-diiodophthalate and trimer 2 were synthesized according to literature procedures.