Table 2. Addition of Alcohols to DIC Using ZnEt₂ as a Precatalyst^a.

^aReaction conditions: the corresponding alcohol (0.50 mmol) or diol (0.25 mmol), 79.0 μL of DIC (0.50 mmol), 25.0 μL of a 1 M solution of ZnEt₂ in hexane (0.025 mmol) in C₆D₆ (500 μL) at 60 °C, using Si(SiMe₃)₄ as an internal standard.

^bIsomer ratio.

^cIsolated yield from a preparative scale reaction.