[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)=[CH:4][CH:3]=1.C(=O)([O-])[O-].[K+].[K+].[CH3:20][C:21]([C:24]([CH2:26][Cl:27])=[O:25])([CH3:23])[CH3:22]>C(C(C)=O)C>[CH3:20][C:21]([C:24]([CH2:26][Cl:27])=[O:25])([CH3:23])[CH3:22].[C:8]1([C:5]2[CH:4]=[CH:3][C:2]([O:1][CH2:26][C:24](=[O:25])[C:21]([CH3:23])([CH3:22])[CH3:20])=[CH:7][CH:6]=2)[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1510 g (3 moles) of 4-hydroxybiphenyl were dissolved in 3 l of methyl ethyl ketone. 390 g of ground potassium carbonate were added and the mixture was heated to 80° C. 405 g (3 moles) of α-chloropinacoline were added dropwise over the course of 2 hours and the mixture was then stirred for a further 15 hours at 80° C. After cooling, it was filtered and the filter residue was rinsed with methyl ethyl ketone. The resulting filtrate was concentrated to dryness in vacuo by distilling off the solvent. The residue was taken up in methylene chloride and the solution was washed with 10% strength sodium hydroxide solution and twice with water, dried over sodium sulfate and concentrated in vacuo by distilling off the solvent. The residue was distilled, using a condenser cooled with hot water (50° C.), to avoid crystallization. After a small amount of first runnings of chloropinacoline at 40° C./0.4 mm Hg, 658 g (82% of theory) of 1-(4'-phenyl-phenoxy)3,3-dimethylbutan-2-one were obtained at 170° to 180° C./0.4 mm Hg.
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