Table 2. Propargylic variation in the substrates³⁴ .

^aYield based on ¹H NMR peak integration relative to methyl-4-nitro-benzoate.

^bIsolated yields (average of 2 trials).

^cHexanes, 90 °C.

^dIsopropyl acetate, 100 °C.

^eHexanes, 100 °C.