PTFE (500 mg) was then added. The flask was manually swirled for 15 seconds and left overnight. After 16 hours, the solution had gone from red to dark brown/red. The C6H6 solution was separated from the solid by cannula filtration. The product 2 could be isolated by removal of the solvent in vacuo, in an 85 % yield (591 mg, 0.6 mmol). Single-crystals suitable for X-ray crystallography were grown by slow evaporation of a concentrated C6H6 solution of 2. The dark grey solid polymer product is isolated after cannula filtration, and washed with toluene (3x 5 mL) and hexane (3 x 15 mL), and dried under vacuum.