Table 1.

Examining organic hydrogen acceptors for oxidative esterification.^[a]

47% (5.9:1)	35% (4.4:1)[c]	12% (2.4:1)	78% (8.7:1)[e]	95% (48:1)[f]
98% (5.5:1)[b]	10% (>99:1)[c, d]

^[a]Conditions: 0.1 mmol 1a, 0.1 mmol 2a, 0.2 M. Yields were determined by GC analysis using dodecane as an internal standard. IPr = 1,3-Bis(2,6- diisopropylphenyl)imidazole-2-ylidene. Yield of product 4a is shown, and the ratio of 4a:5a is shown in parentheses.

^[b]Using 2.5 equivalents of 1a.

^[c]Reaction performed at 80 °C.

^[d]Using 100 equivalents of 3a.

^[e]Using 3 equivalents of 3c.

^[f]Reaction performed at 30 °C.