Conjugate addition of phenylzinc halides to chalcone^a.

Entry	“PhZnX”	Solvent	% convc	Time
1	PhZnI + LiCl	DMEb	97	24 h
2	PhZnI + LiCl	DME	98	24 h
3	PhZnI + LiCl	THF	23	24 h
4	PhMgBr + ZnBr2	DME	30	24 h
5	PhMgBr + ZnBr2	THF	11	24 h
6	TMEDA + Zn(Ag)	DME	0	24 h
7	PhZnI + LiCl	DMEd	99	2 h

^aChalcone (1 mmol), “PhZnX” (1.5 mmol), solvent (2 mL).

^bToluene was used as a cosolvent in the conjugate addition step.

^cApparent conversion determined by GC analysis.

^dReaction performed at 50 °C.