Selective photodimerisations of coumarin 1 as the guest in inclusion compounds are reported. For example, irradiation of two 1:1 crystalline inclusions of 1 with (R,R)-(–)-trans-4,5-bis-(hydroxydiphenylmethyl)-2,2-dimethyl-1,3-dioxacyclopentane 8a prepared by recrystallisation of the component from toluene-hexane and ethyl acetate–hexane gave syn-head-to-head 2 and (–)-anti- head -to -head dimer 4 with 96% e.e.
K. Tanaka and F. Toda, J. Chem. Soc., Perkin Trans. 1, 1992, 943 DOI: 10.1039/P19920000943
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