Diphenylacetylene and 1,1-dimethyl-2,5-diphenyl-1-silacyclopentadiene crystallize from solution as a 1:1 crystal complex, not as the Diels-Alder adduct; the structure of this complex was determined by X-ray diffraction.
J. Clardy and T. J. Barton, J. Chem. Soc., Chem. Commun., 1972, 690 DOI: 10.1039/C39720000690
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