Reuses of MgCl₂ (5 mol%) for the intermolecular ketone-ene reaction between α-methyl styrene 1 and methyl pyruvate 2 (1 equivalent) without any solvent at room temperature for 18 h. GC yields.

Use	1	2	3	4	5	6	7	8	9	10
Yield (%)	92	86	94	84	84	86	80	82	94	84