Phosphoric Acid → 1-[1-(Allyloxy)-2-methyl-2-propenyl]-4-methylbenzene

Participants

Reaction Steps

Solid sodium tert-butylate (66.65 g, 0.589 mol) was dissolved under nitrogen in dry THF (350 ml) and 1-(4-methylphenyl)-2-methyl-2-propen-1-ol (41.16 g, 0.239 mol) in dry THF (25 ml) was added in 15 minutes without external cooling. The reaction was further stirred at room temperature for 50 minutes. Tetra butyl ammonium iodide (5.04 g, 0.014 mol) was added followed by allyl chloride (40 g, 0.518 mol) in 25 minutes (exothermic to 47° C.). The reaction was stirred for 24 hours, before adding more tetra butyl ammonium iodide (2.30 g, 0.006 mol) and allyl chloride (9.30 g, 0.120 mol). After stirring for 24 hours at room temperature, the reaction was poured onto ice, diluted with MTBE and acidified with aqueous phosphoric acid. The organic phase was washed with brine, saturated aqueous sodium bicarbonate and brine and dried over solid anhydrous sodium sulfate. The solid was filtered off, rinsed with MTBE and solvents were removed under vacuum. The product was purified by distillation through a 35-cm Fisher column. 38.78 g of the desired allyl ether were obtained (yield=80%). B.P.=79° C./1.6 mbar

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