Patent ID: 8344080

Claim:
A preparation method of 2,2′-dialkoxy-1,1′-binaphthyl compound, comprising the following two-step reaction: a) at the reaction temperature from 20 to 95° C., using a ferric chloride solution to heterogeneously oxidize and couple a 2-naphthol compound into an intermediate designated as 2,2′-dihydroxyl-1,1′-binaphthyl compound, and filtering the solution to obtain the intermediate 2,2′-dihydroxyl-1,1′-binaphthyl compound, oxidizing ferrous chloride in the filtrate to generate ferric chloride by hydrogen peroxide, and reusing ferric chloride in the filtrate solution; and b) causing the intermediate 2,2′-dihydroxyl-1,1′-binaphthyl compound to turn into a 2,2′-dialkoxy-1,1′-binaphthyl compound of formula II by a tri-phase phase-transfer process in presence of an alkali solution, an organic solvent, a phase-transfer catalyst and an etherification reagent at 20-90° C., filtering the 2,2′-dialkoxy-1,1′-binaphthyl compound of formula II, washing the 2,2′-dialkoxy-1,1′-binaphthyl compound of formula II successively with an organic solvent, 5% sodium hydroxide solution and water, and drying the 2,2′-dialkoxy-1,1′-binaphthyl compound of formula II to obtain the 2,2′-dialkoxy-1,1′-binaphthyl compound, separating the organic solvent from the filtrate and the washout solution, and reusing the organic, wherein: R 2 is a linear or branched alkyl radical containing from 1 to 8 carbon atoms, and the two R 2 groups in formula II is either identical or different; R 1 is hydrogen, halogen, R 3 or OR 3 , and two adjacent R 3 groups are capable of bonding mutually to form fused saturated or unsaturated cyclic structure; R 3 is selected from the group consisting of linear or branched alkyl radical containing from 1 to 20 carbon atoms, cycloalkyl radical containing from 3 to 20 carbon atoms, aryl radical containing from 6 to 20 carbon atoms and alkaryl or aralkyl radical containing from 7 to 20 carbon atoms; R 1 groups are either identical or different.