S(Cl)([Cl:3])=O.[CH:5]([CH:8]1[CH2:13][CH2:12][C:11]([C:15]([OH:17])=O)([CH3:14])[CH2:10][CH2:9]1)([CH3:7])[CH3:6]>>[CH:5]([CH:8]1[CH2:13][CH2:12][C:11]([CH3:14])([C:15]([Cl:3])=[O:17])[CH2:10][CH2:9]1)([CH3:7])[CH3:6]An excess of thionyl chloride was added to 10 g of 4-isopropyl-1-methylcyclohexylcarboxylic acid (cis:trans=1:1, b.p.=122° C./2 mm Hg), and the mixture was stirred for 3 hours. The remaining thionyl chloride was distilled off in a vacuum from the resulting reaction mixture, and the oily product obtained was distilled in a vacuum to obtain 9.5 g of 4-isopropyl-1-methylcyclohexylcarbonyl chloride having a boiling point of 150° to 152° C./60 mm Hg. (Yield: 86.4%.)
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