Table 2.

Carbonylative Conjugate Addition of Et₂Zn To α,β-Unsaturated Ketones.^a

entry	substrate	% yield
		L=PPh3	L=PCy3
1		82	80
2		81	81
3		84	82
4		79	80
5		86	87
6		52	82
7		67	66b
8		85	86
9		56	48
10		68	67
11		72	55c

^aReaction with 1.3 equiv Et₂Zn, 2.3 equiv TMSCl, 1 atm CO, for 4 h (7 h for entry 4; 24 h for entry 11). Subsequent to reaction, the mixture was quenched at 0 °C with acetic acid (1.5 equiv) and TBAF (1.5 equiv) for 10 minutes and then treated with saturated Na₂CO₃.

^bYield adjusted to account from unremovable impurity (ca. 10%).

^c10% Pd₂(dba)₃, 24% ligand, and 1.95 equiv Et₂Zn employed.