Table 2.

Dependence on the stoichiometric amount of propiophenone (1a) enolate with regard to the metal (reaction time: 2 h, reaction temperature: 25 °C, 5a/6a in %).

Entry	Metal chloride	Amount of propiophenone (1a)
		2 equiv		3 equiv		4 equiv		6 equiv
		5a	6a	5a	6a	5a	6a	5a	6a
1	ZrCl4	33	48	76	23	68	22	–	–
2	SnCl4	20	45	14	35	36	22	–	–
3	AlCl3	–	–	66	8	–	–	66	34
4	InCl3	–	–	85	13	–	–	>99	–