[CH3:1]I.[OH:3][C:4]1[CH:5]=[C:6]2[C:11](=[CH:12][C:13]=1[O:14][CH:15]([CH2:17][CH3:18])[CH3:16])[O:10][C:9]([CH3:20])([CH3:19])[CH2:8][C:7]2=[O:21]>[OH-].[Na+].ClCCl.[Cl-].C([N+](CC)(CC)CC1C=CC=CC=1)C>[CH3:1][O:3][C:4]1[CH:5]=[C:6]2[C:11](=[CH:12][C:13]=1[O:14][CH:15]([CH2:17][CH3:18])[CH3:16])[O:10][C:9]([CH3:19])([CH3:20])[CH2:8][C:7]2=[O:21]In 40 ml of a 5% sodium hydroxide solution 5.2 g (20 -millimoles) of 6-hydroxy-7-sec. butoxy-2,2-dimethyl-4-chromanone are dissolved whereupon 80 ml of dichloro methane and 0.5 g of triethyl benzyl ammonium chloride are added and the mixture is intensively stirred at room temperature for 30 minutes. After the addition of 4.25 g (1.9 ml, 30 millimoles) of methyl iodide the reaction mixture is stirred for another 2 hours. The organic phase is separated, washed twice with 50 ml of water each, dried over sodium sulfate and the solvent is removed. The residue is crystallized from 90% ethanol. Thus 5.34 g of the desired compound are obtained, yield 96%. Mp.: 92.5°-93° C.
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