Abstract
The Diels-Alder reaction of diphenyl(1,2-propadienyl)phosphine oxide 1 and diphenyl(1-propynyl)phosphine oxide 2 with cyclopentadiene is reported. 1 reacts smoothly at room temperature in the presence of one equivalent of aluminum trichloride to give the corresponding adducts endo 3a and exo 3b (90:10 ratio) whose structure was attributed on the basis of their 13C NMR spectra, whereas 2 is a poor dienophile, affording the corresponding adduct in low yield even under harsh conditions.
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