[O:1]=[CH:2][CH2:3][CH2:4][C:5]([CH3:18])=[CH:6][CH2:7][O:8][C:9]1[CH:17]=[CH:16][C:12]2[CH2:13][CH2:14][O:15][C:11]=2[CH:10]=1.C(OCC)C.[C:24]([Li])([CH3:27])([CH3:26])[CH3:25]>CCCCC>[OH:1][CH:2]([C:24]([CH3:27])([CH3:26])[CH3:25])[CH2:3][CH2:4][C:5]([CH3:18])=[CH:6][CH2:7][O:8][C:9]1[CH:17]=[CH:16][C:12]2[CH2:13][CH2:14][O:15][C:11]=2[CH:10]=11.94 g. of 6-[(6-oxo-3-methyl-2-hexenyl)-oxy]-2,3-dihydrobenzofuran are dissolved in 80 ml. of absolute diethyl ether and treated dropwise at 0° C. under nitrogen over a period of 20 minutes with 5 ml. of a 2-M solution of tertbutyl lithium in pentane. The mixture is then poured into ice-cold saturated aqueous ammonium chloride solution and extracted twice with diethyl ether. The extracts are dried over sodium sulfate and evaporated. There is obtained crude 6-[(6-hydroxy-3,7,7-trimethyl-2-octenyl)-oxy]-2,3-dihydrobenzofuran which is used in the process without further purification.
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