Table 3.

Stoichiometry dependence on the amount of aldehyde (reaction time: 2 h, reaction temperature: 25 °C, 5a/6a in %).

Entry	Metal	In presence of benzaldehyde (3a) in
		1 equiv		1.5 equiv		2 equiv		4 equiv
		5a	6a	5a	6a	5a	6a	5a	6a
1	Zr	65	7.0	40	16	19	31	5	60
2	Al	66	8	42	39	30	40	–	–
3	In	78	13	53	30	34	42	–	–