[CH2:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH2:4][CH2:3][C:2]1=O.[C:12]1([Mg]Cl)[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.CCCCCCCCCCCCC.Cl>C1COCC1.C1(C)C=CC=CC=1>[C:12]1([C:2]2[CH2:3][CH2:4][C:5]3[C:10](=[CH:9][CH:8]=[CH:7][CH:6]=3)[CH:1]=2)[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1
1.32 mL (10.0 mmol) 2-tetralone in 5 mL of THF was added to a solution of 5.77 mL (12.0 mmol) 2.08 M phenylmagnesium chloride in THF at 0° C. The mixture was allowed to warm to room temperature, and was then stirred for an additional 1 hour. Tridecane (1.22 mL; 5.00 mmol; internal GC standard) was added, the mixture was cooled to 0°, 10 mL of 6N HCl was added. The mixture was heated to 65° and vigorously stirred for 4 hours. The mixture was then cooled to room temperature and diluted with toluene. GC analysis of the organic phase showed the presence of 2.9 mmol 2-phenyl-3,4-dihydronaphthalene (29% yield on 2-tetralone) and 4.6 mmol 2-tetralone (46% recovery). No benzylic alcohol intermediate from addition of the arylmagnesium reagent to the ketone was detected, indicating that its dehydration to the vinylaromatic had been completed by the warm acid treatment.
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