Table 2.

Hydroacyloxylation activity of Ru catalysts.

entry	catalyst	co-ligand	yield[a]	isomer ratio[b] (E)-23 : (Z)-23 : 24
1	14	–	96%	61 : 36 : 3
2	15	–	1%	24 : 74 : 2
3	16	–	41%	68 : 25 : 7
4	16	11	29%	24 : 72 : 4
5	17	–	39%	35 : 59 : 6
6	18	–	25%	43 : 50 : 7
7	18	11	35%	31 : 66 : 3
8	19	–	79%	46 : 42 : 12
9	19	11	71%	12 : 88 : 0
10	20	–	64%	68 : 24 : 8
11	20	11	85%	22 : 70 : 8
12	21 [c]	–	56%	60 : 40 : 0
13	21	11	35%	17 : 83 : 0
14	9	–	100%	73 : 20 : 7

^[a]Combined yield of isomers (E)-23, (Z)-23, and 24, after chromatographic separation from other materials.

^[b]Vinylic ester isomers (E)-23, (Z)-23, and 24 were chromatographically inseparable. Isomer ratios were determined by ¹H NMR integration of diagnostic alkene resonances in the product mixture, prior to chromatographic purification.

^[c]21=[CpRu(NCMe)₃][PF₆].