Table 2. Scope of enones ^a .

Entry	Substrate		Product		Yield b [%]	ee c [%]
1		2b		3b	50	90
2		2c		3c	34	89
3		2d		3d	39	73
4		2e		3e	46	91
5		2f		3f	41	85
6 d		2g		3g	48	92
7		2h		3h	71	98
8		2i		3i	61	93
9		2j		3j	80	93
10 e		2k		3k	80	96
11 e		2l		3l	54	96
12		2m	—	—	—	—
13		2n	—	—	—	—
14		cis-2b		R-3b	32	71

^aReaction conditions: Ethylene balloon, [Cp₂ZrHC1] (2 eq.), CH₂C1₂; then enone (1 eq.), copper (10 mol%), ligand (10 mol%), silver (11 mol%), TMSC1 (5 eq.).

^bYield of isolated product.

^cee was determined by HPLC.

^dee was determined by GC.

^eThe enantiomer of ligand of B was used in these examples because the order of elution of the enantiomers aided ee determination.