Solid state photodimerization of psoralen derivatives

Article abstract of DOI:10.1016/S0040-4039(00)97797-9

Stereo selective reversible photodimerization of 8-alkoxypsoralen 1-thymine derivatives occurs in the solid state with topochemical control, the reactive pyrone double bonds of the monomers being favourably oriented in the crystal to produce only the exo head-to-tail dimer.