The solvent-free formation and purification of the photoproduct rctt-tetrakis(4-pyridyl)cyclobutane has been achieved using 1,2-dibromo-4,5-difluorobenzene as the template. Dry vortex grinding yielded the photoreactive co-crystal. During the [2 + 2] cycloaddition reaction, the template readily sublimes resulting in virtually pure photoproduct in a completely solvent-free approach.
A. L. Grobelny, F. A. Verdu and R. H. Groeneman, CrystEngComm, 2017, 19, 3562 DOI: 10.1039/C7CE00954B
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