Cocrystallization of 4-stilbazole with 4,6-diX resorcinol (X = Cl or Br) yields a pair of photoreactive isostructural solids. Small variations in the spatial arrangement within each cocrystal leads to either the head-to-head (hh) or the unexpected head-to-tail (ht) photoproduct after undergoing a solid-state [2 + 2] cycloaddition reaction.
![Graphical abstract: Varying the regiochemistry of a [2 + 2] cycloaddition reaction within isostructural hydrogen bonded cocrystals containing 4-stilbazole](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C8CE00447A&imageInfo.ImageIdentifier.Year=2018)
A. L. Grobelny, N. P. Rath and R. H. Groeneman, CrystEngComm, 2018, 20, 3951 DOI: 10.1039/C8CE00447A
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