[Mg].II.[CH3:4][O:5][C:6]1[CH:7]=[C:8]([CH:11]=[CH:12][CH:13]=1)[CH2:9]Cl.CN(C)[C:16]([CH:18]1[CH2:20][CH2:19]1)=[O:17]>O1CCCC1.C(OCC)C>[CH3:4][O:5][C:6]1[CH:7]=[C:8]([CH:11]=[CH:12][CH:13]=1)[CH2:9][C:16]([CH:18]1[CH2:20][CH2:19]1)=[O:17]
A 250 ml round-bottomed flask is filled with magnesium (4.9 g, 0.20 mol) and iodine (0.1 g) is sublimated to the magnesium, then diethyl ether (100 ml) is added and under boiling a solution of 3-methoxybenzyl chloride (11.9 ml, 0.1 mol) and diethyl ether (40 ml) are added to the reaction mixture. The mixture is boiled for one hour and at this temperature a solution of cyclopropanecarboxylic acid dimethylamide (16.6 g, 0.15 mol) and tetrahydrofuran (70 ml) are added. The reaction mixture is stirred for half an hour and under cooling aqueous hydrogen chloride (80 ml, 1:1) is added dropwise to the mixture. The organic layer is dried and the residue (32 g) is fractionated in vacuo.
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