[CH3:1][C:2]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1)=[CH2:3]>O>[CH3:3][C:2]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1)=[CH2:1].[CH3:3][C:2]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1)=[CH2:1]Heteropolyacids in the presence of water were reported to dimerized α-methylstyrene in Japanese patent application JP07/242,573 (CA 123.339126j). At 100° C., H3PW12O40 and water was reported to give 86.1% of α-methylstyrene dimer.
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