Table 2. Effect of the Nitrile Component.

^aNitriles: 9: acrylonitrile. 10: 5-methylfuran-2-carbonitrile. 14: cyclopropylnitrile.

^bMethod A: crude reaction mixtures were filtered through a 4 g silica plug to remove insoluble cobalt species; combined fractions were assayed for conversion by ¹H NMR. Organics were then chromatographed to obtain yields.

^cConversions determined by ¹H NMR spectroscopy.

^d∗ = coelution with diyne using standard chromatographic conditions. Regioselectivity was determined on the basis of 1D NOE studies of 21 (Supporting Information).