Phosphine-catalysed cycloaddition of buta-2,3-dienoates and
but-2-ynoates to [60]fullerene
In the presence of phosphine catalysts, ethyl buta-2,3-dienoate and ethyl but-2-ynoate undergo [3 + 2] as opposed to [2 + 2] dipolar cycloaddition to [60]fullerene.
