The present invention relates to a preparation method of (S)-(-)-1,1,2-triphenyl-1,2-
ethylene glycol, which is characterized in that methyl mandelate and
phenylmagnesium bromide are respectively dissolved Make methyl mandelate solution and
phenylmagnesium bromide solution after
solvent; The methyl mandelate solution that makes and
phenylmagnesium bromide solution are imported into the first microchannel reactor by a
metering pump and carry out main reaction respectively, The reaction solution obtained after the reaction directly flows into the second microchannel reactor, and when the reaction solution flows into the second microchannel reactor, the acidic
aqueous solution is input into the second microchannel reactor through a
metering pump for
quenching reaction, and the
quenching reaction ends After obtaining the reaction solution, the reaction solution was separated into
layers to take the organic phase, dried and concentrated under reduced pressure, and then recrystallized with
toluene to obtain the finished product (S)-(-)-1,1,2-triphenyl-1 ,2‑
ethylene glycol. The invention has the advantages of high yield and rapid reaction.