[CH3:1][C:2]1[C:3]2[C:8]([CH:9]=[C:10]3[C:15]=1[CH:14]=[CH:13][CH:12]=[CH:11]3)=[CH:7][CH:6]=[CH:5][CH:4]=2.[Ba].[H][H]>[Cr]([O-])([O-])=O.[Cu+2].C(O)C>[CH3:1][CH:2]1[C:3]2[CH:4]=[CH:5][CH:6]=[CH:7][C:8]=2[CH2:9][C:10]2[C:15]1=[CH:14][CH:13]=[CH:12][CH:11]=29,10-Dihydro-9-methylanthracene was prepared by pressurizing a mixture of 2 g of 9-methylanthracene, 0.5 g of a barium-promoted copper chromite catalyst (Girdler G-22), and 3 ml of ethyl alcohol with hydrogen to 3000 psi at room temperature, followed by heating the mixture at a temperature of 150° C. for 1 hour with agitation. The product was characterized by nmr spectroscopy. The products of four such runs were combined, and the mixture was vacuum-distilled to give 9,10-dihydro-9-methylanthracene as a pale-yellow solid.
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