Methyl iodide → 5'-Methoxy-spiro(cyclopentane-1,1'-indan)-3'-one

Reaktionsgleichung

[OH:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[C:7]1([CH2:14][CH2:13][CH2:12][CH2:11]1)[CH2:6][C:5]2=[O:15].[C:16](=O)([O-])[O-].[K+].[K+].CI>CC(C)=O>[CH3:16][O:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[C:7]1([CH2:14][CH2:13][CH2:12][CH2:11]1)[CH2:6][C:5]2=[O:15]

Komponenten

Versuchsvorschrift

A mixture of 5'-hydroxy-spiro(cyclopentane-1,1'-indan)-3'-one (20.2 g; 0.1 mole), acetone (1000 ml), anhydrous potassium carbonate (37.5 g) and methyl iodide (50 ml) is refluxed for 5-6 hours. The mixture is evaporated to dryness, after which the residue is taken up in water and trichloroethylene. The trichloroetylene solution is extracted with 2×150 ml of 2 N sodium hydroxide and dried with anhydrous magnesium sulphate. The solvent is distilled off and a yellow oil is obtained, which soon crystallizes, yield 16 g (74%). After recrystallization from n-hexane the substance melts at 80° C.