Table 1.

Results of the diethylzinc additions to benzaldehyde.

Entry a	ZnEt2 (equiv.)	L* (equiv.)	Solvent	Time [h]	Yield [%]	e.r. (Config.)
1 b	3	10 (0.1)	DCM	18	85	54.5:45.5 (S)
2 b	3	10 (0.1)	Toluene	18	95	57:43 (S)
3	2	16 (0.1)	Toluene	20	83	55:45 (R)
4	2	10 (0.1)	Toluene	20	87	74.5:25.5 (S)
5	2	31 (0.1)	Toluene	24	82	64:36 (S)
6	2	27 (0.1)	Toluene	24	86	80.5:19.5 (S)
7	2	15 (0.1)	Toluene	20	35	53:47 (R)
8	2	9 (0.1)	Toluene	20	61	71.5:28.5 (S)
9	2	26 (0.1)	Toluene	20	73	54.5:45.5 (R)
10	2	30 (0.1)	Toluene	20	70	51.5:48.5 (R)

^a All reactions performed at r.t.; ^b In the presence of Ti(OiPr)₄ (1.4 equiv.).