Table 1.

Catalytic carbometalation of propargylic alcohol 1a.^a

entry	CH3M	catalystb	ligandb	conv. (%)c	2a/3ad
1	CH3MgBr	CuBr	none	<5	---
2	CH3MgBr	Co(OAc)2	none	58	9/1
3	CH3MgBr	Ni(acac)2	none	63	9/1
4	CH3MgBr	Fe(acac)3	none	98	6/1
5e	CH3MgBr	Fe(ehx)3	none	98	5/1
6	CH3MgBr	Fe(acac)3	dppe	97	21/1
7	CH3Li	Fe(acac)3	none	0	---

^aReactions were carried out on 0.1 mmol scale under a N₂ for 7 h.

^b20 mol%.

^cDetermined by GC using an internal standard.

^dDetermined by GC analysis of crude reaction mixture.

^eehx = 2-ethyl hexanoate