Acetone → 2,3-dihydro-2,4-dimethyl-3-phenyl-7-crotyloxy-1H-inden-1-one

Reaction equation

[CH2:20]([CH:21]=[CH:22][CH3:23])[Br:24].[CH3:1][CH:2]1[C:3](=[O:19])[c:4]2[c:5]([OH:18])[cH:6][cH:7][c:8]([CH3:17])[c:9]2[CH:10]1[c:11]1[cH:12][cH:13][cH:14][cH:15][cH:16]1.[CH3:27][C:28](=[O:29])[CH3:30].[K+:26].[OH-:25]>>[CH3:1][CH:2]1[C:3](=[O:19])[c:4]2[c:5]([O:18][CH2:20][CH:21]=[CH:22][CH3:23])[cH:6][cH:7][c:8]([CH3:17])[c:9]2[CH:10]1[c:11]1[cH:12][cH:13][cH:14][cH:15][cH:16]1