O[C:2]1([C:8]2[CH:13]=[CH:12][C:11]([C:14]3[O:15]CC(C)(C)N=3)=[C:10]([CH3:21])[CH:9]=2)[CH2:7][CH2:6][CH2:5][CH2:4][CH2:3]1.CC1C[O:26]C(C)=N1.Cl>C(O)(=O)C>[C:2]1([C:8]2[CH:13]=[CH:12][C:11]([C:14]([OH:15])=[O:26])=[C:10]([CH3:21])[CH:9]=2)[CH2:3][CH2:4][CH2:5][CH2:6][CH:7]=1To a solution of 2-[4-(1-hydroxy-1-cyclohexyl)-2-methylphenyl]-4,4-dimethyl-2-oxazoline (4.29 g) in acetic acid (40 ml) is added a 10% dimethyl-2-oxazoline (4.29 g) in acetic acid (40 ml) is added a 10% hydrochloric acid (20 ml), and the mixture is refluxed for two days. The precipitated crystals are collected by filtration, washed with water, and dried to give 4-cyclohexenyl-2-methylbenzoic acid (2.61 g) as white powder.
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