NOVELTY - Dehydroxylation of mercapto, alkoxy, acetoxy, allyloxy group comprises e.g. using e.g. benzophenone (thio) alcohol derivative and benzene methyl ether derivative as raw material, and boron trifluoride ether as accelerator, adding (thio) alcohol, ether series or ester derivative and water in a reactor, adding ether series solvent, refining, stirring, adding boron trifluoride, reacting, preparing reaction mixed liquid, naturally cooling in air the reaction liquid, concentrating with rotary evaporimeter, purifying by silicon glue column chromatography, and eluting using petroleum ether.    USE - The method is useful for dehydroxylation of mercapto, alkoxy, acetoxy, allyloxy group (claimed).    ADVANTAGE - The method has simple operation, is economical and environmentally friendly, has high safety and wide market application prospect.    DETAILED DESCRIPTION - Dehydroxylation of mercapto, alkoxy, acetoxy, allyloxy group comprises (i) carrying out reaction: using benzophenone (thio) alcohol derivative, benzene methyl ether derivative, a benzene methyl ester derivative or alcohol as raw material, using boron trifluoride ether as accelerator, water as auxiliary agent, according to (thio) alcohol, ether or ester derivative mmol, boron trifluoride ether, water mmol, solvent ml ratio is 1:(0.2-1.5):(0-0.96):1, under the protection of nitrogen, firstly adding (thio) alcohol, ether series or ester derivative and water in a reactor, then adding ether series solvent, refining, stirring, then adding boron trifluoride, after finishing addition, maintaining oil bath temperature at 80-160 degrees C, stirring and reacting for 2 hours, preparing the reaction mixed liquid, where the solvent is diethyl ether, tetrahydrofuran, 2-methyl tetrahydrofuran or n-butyl, and (ii) concentrating product and purifying: preparing reaction liquid, naturally cooling in air, concentrating reaction liquid with rotary evaporimeter, purifying concentrated liquid by silicon glue column chromatography, eluting using petroleum ether, adding eluate in silicon glue column chromatography and concentrating by rotary evaporation, and drying to obtain the product.