Hydrochloric Acid → 4-hydroxy-4'-((S)-2-methylbutyloxy)biphenyl

Beteiligte Stoffe

Reaktionsschritte

A mixture of 4,4'-dihydroxybiphenyl (500 g), ethyl alcohol (7.5 l) and potassium hydroxide (302 g) was heated with stirring under reflux, and (+)-2-methylbutylbromide (prepared from (-)-2-methylbutanol and phosphorus bromide) (530 g) was dropwise added to carry out reaction for 4 hours, followed by distilling off ethanol, adding water (2 l), filtering, collecting insoluble matter, adding toluene to this insoluble matter to dissolve and remove toluene-soluble matter (this soluble matter, when recrystallized from ethyl alcohol, gave scaly crystals having a m.p. of 80.5° C.; thus the compound was confirmed to be 4,4'-di((S)-2-methylbutyloxy)biphenyl), heating the insoluble matter together with 3N-hydrochloric acid with stirring, cooling solid matter and recrystallizing from toluene and then from ethyl alcohol to obtain 4-hydroxy-4'-((S)-2-methylbutyloxy)biphenyl (XXI) having a m.p. of 137.5° C. (125 g).

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