TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: In step iv), the metal catalyst is selected from Ni/C, Pd/C, or Pt/C catalyst; and the reaction solvent is selected from methanol, ethanol, isopropanol, butanol, diethyl ether, methyl t-butyl ether, tetrahydrofuran, 2-methyl-tetrahydrofuran, anisole, acetonitrile, benzene, toluene or xylene.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Preparation of the compound (V) involves adding diphenyl methanone compound of formula (VI) as a starting material, in a reducing agent, and carrying out reduction reaction in the presence of Lewis acid to give the compound (V), where the reducing agent is selected from: a) 1-3C silane such as triethylsilane, trimethylsilyl, tri-n-propyl silane, or triisopropylsilyl, b) borohydride such as sodium borohydride, potassium borohydride, or borane, or c) aluminum hydride such as lithium aluminum hydride, the Lewis acid is selected from e.g. boron trifluoride etherate, trifluoroacetic acid, hydrogen chloride, hydrogen bromide, aluminum chloride or indium trichloride, where the reaction is carried out in an aprotic solvent selected from at least two of methylene chloride, 1,2-dichloroethane benzene, toluene, xylene, acetonitrile, tetrahydrofuran, n-hexane, petroleum ether or n-heptane, and the reaction temperature is -20 degrees C to 130 degrees C. Preferred Components: In the step (i), the alkali metal reagent is selected from an alkyl lithium reagent such as n-butyllithium, sec-butyllithium, or tert-butyllithium; Grignard reagent such as isopropyl Grignard reagent; or Grignard reagent mixed with lithium chloride system; where the addition reaction in an organic solvent, the organic solvent is selected from 2-8C ether or aromatic hydrocarbon solvent. The 2-8C ether is tetrahydrofuran, dioxane, diethyl ether, methyl tert-butyl ether, or anisole. The aromatic hydrocarbon solvent is benzene, toluene and/or xylene. The 1-3C alcohol solution is methanol, ethanol, n-propanol or isopropanol. The acid catalyst is methanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, benzoic acid, trifluoromethanesulfonic acid, and hydrogen chloride. In step (ii), the acidic additive is boron trifluoride etherate, trisperfluorophenyl borane, trifluoroacetic acid, hydrogen chloride, hydrogen bromide, aluminum chloride, or indium trichloride, where the reaction is carried out in an aprotic solvent. The aprotic solvent is selected from dichloromethane, 1,2-dichloroethane benzene, toluene, xylene, acetonitrile, tetrahydrofuran, n-hexane, petroleum ether, and/or n-heptane. In step iii), the basic compound is selected from e.g. potassium tert-butoxide, sodium tert-butoxide, lithium tert-butoxide, sodium methoxide, potassium methoxide, sodium ethoxide, potassium ethoxide, potassium carbonate, sodium carbonate, cesium carbonate, potassium hydroxide, sodium hydroxide, triethylamine, diisopropyl ethyl amine, and/or 1,8-diazabicyclo (5.4.0) undec-7-ene. The reaction solvent is tetrahydrofuran, 2-methyl tetrahydrofuran, 1,4-dioxane, or dimethyl sulfoxide. In step iv), the acid is an organic acid or an inorganic acid, where the organic acid is citric acid, oxalic acid, acetic acid, methanesulfonic acid, benzoic sulfo acid, trifluoromethanesulfonic acid, or p-toluenesulfonic acid, and the inorganic acid is hydrogen chloride, hydrogen bromide, sulfuric acid, or phosphoric acid.