[CH:1]([C:4]1[CH:12]=[CH:11][CH:10]=[C:9]([CH:13]([CH3:15])[CH3:14])[C:5]=1[C:6](O)=[O:7])([CH3:3])[CH3:2].C(Cl)(=O)C([Cl:19])=O>CN(C)C=O>[CH:1]([C:4]1[CH:12]=[CH:11][CH:10]=[C:9]([CH:13]([CH3:15])[CH3:14])[C:5]=1[C:6]([Cl:19])=[O:7])([CH3:3])[CH3:2]A mixture of 2,6-diisopropylbenzoic acid (12.8 g, 0.062 mol), oxalyl chloride (25 mL), and dimethylformamide (2 drops) was stirred overnight at room temperature. The volatiles were removed on the rotary evaporator and the residue dried to yield an orange oil, 12.65 g, 90.9%.
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