Methyl 3,3-Bis(4-chlorophenyl)propenoate → Methyl 3,3-Bis(4-chlorophenyl)propionate

Reaktionsgleichung

[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]([C:14]2[CH:19]=[CH:18][C:17]([Cl:20])=[CH:16][CH:15]=2)=[CH:9][C:10]([O:12][CH3:13])=[O:11])=[CH:4][CH:3]=1>CO.Cl.[Pt](=O)=O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]([C:14]2[CH:15]=[CH:16][C:17]([Cl:20])=[CH:18][CH:19]=2)[CH2:9][C:10]([O:12][CH3:13])=[O:11])=[CH:6][CH:7]=1

Komponenten

Versuchsvorschrift

A suspension of methyl 3,3-bis(4-chlorophenyl)propenoate (Step A, 3.0 g, 14 mmol) and platinum dioxide (0.30 g) in MeOH (20 mL) and 2 M aqueous hydrochloric acid (1 mL) was degassed and filled with hydrogen with a balloon. After stirring at room temperature for 2 h, the reaction mixture was filtered through CELITE diatomaceous earth, and the filtrate was concentrated to dryness. The residue was dissolved in 50 mL ether and was concentrated with 20 g silica gel. The material was loaded onto a silica gel column, which was eluted with 10% ether in hexane to give the title compound. 1H NMR (500 MHz, CD3OD): δ 7.29-7.22 (m, 4H), 4.50 (t, 1H), 3.56 (s, 3H), 3.07 (d, 2H). LC-MS: m/e 309 (M+H)+ (4.1 min).