Acetone → 7-Allyloxy-5-hydroxy-2,2-dimethyl-4-oxochromane

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[C:16](=[O:17])([O-:18])[O-:19].[CH2:22]([CH:23]=[CH2:24])[Br:25].[CH3:26][C:27](=[O:28])[CH3:29].[K+:20].[K+:21].[OH:1][c:2]1[c:3]2[c:8]([cH:9][c:10]([OH:12])[cH:11]1)[O:7][C:6]([CH3:13])([CH3:14])[CH2:5][C:4]2=[O:15]>>[OH:1][c:2]1[c:3]2[c:8]([cH:9][c:10]([O:12][CH2:24][CH:23]=[CH2:22])[cH:11]1)[O:7][C:6]([CH3:13])([CH3:14])[CH2:5][C:4]2=[O:15]