[F:1][C:2]([F:10])([F:9])[C:3]([CH3:8])([CH3:7])[C:4]([OH:6])=[O:5].C(Cl)(=O)C(Cl)=O.C(N(CC)CC)C.[CH2:24](O)[CH2:25][CH2:26][CH3:27]>C(Cl)Cl.CN(C=O)C>[CH2:24]([O:5][C:4](=[O:6])[C:3]([CH3:8])([CH3:7])[C:2]([F:10])([F:9])[F:1])[CH2:25][CH2:26][CH3:27]3,3,3-Trifluoro-2,2-dimethyl-propionic acid (3.0 g, 19.2 mmol) and a drop of DMF are dissolved in 30 mL of DCM and treated dropwise at RT with oxalyl chloride (1.85 mL, 21.1 mmol). After 2 h gas evolution ceases and the mixture is treated slowly with triethyl amine (5.36 mL, 38.4 mmol) followed by n-butanol (2.1 mL, 23 mmol). The mixture is stirred over night, the solvent evaporated and the residue stirred with hexanes. The solid is filtered off and the filtrate is evaporated to a brown-red oil. Kugelrohr distillation (10 mbar, 60-80° C. oven temperature) gives the title compound a colorless liquid.
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