TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The mol. ratio of alkali, compound (II) and dissolvent A is 1-10:1:1-5, where reflux temperature is -20 degrees C and reaction is carried out for 1-72 hours to form compound (III). The dissolvent (A) or (B) is water, acetonitrile, methyl alcohol, ethylalcohol, isopropyl alcohol, sec-butyl alcohol, tertiary butanol, 3-amyl alcohol, 2-amyl alcohol, tert-amyl alcohol, 2-methyl-1-butyl alcohol, 3- methyl-3-amyl alcohol, ethylene glycol, glycerol, ethylene glycol butyl ether, glycol dimethyl ether, butyl methyl ether, diethyl ether, petroleum ether, tetrahydrofuran, 2-methyl tetrahydrofuran, 1,4-dioxane, N,N-dimethylformamide, N-methyl pyrrolidone extraction, ethyl acetate, n-hexane, normal heptane, dimethyl sulfoxide, chloroform, methylene dichloride, chlorobenzene, dichlorobenzene, benzene, methylbenzene, dimethylbenzene or sym-trimethylbenzene. The alkali is sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, sodium methylate, sodium ethoxide, sodium isopropyl alcohol, potassium isopropyl alcohol, sodium tertiary butanol, potassium tertbutanol, sodium tert-amyl alcohol, potassium tert-amyl alcohol, sodium bicarbonate, potassium bicarbonate, sodium carbonate, potassium carbonate, calcium carbonate, cesium carbonate, lithium carbonate, potassium carbonate, sodium hydrogen, triethylamine, diisopropylethylamine, tributylamine, pyridine, 2,6-dimethyl pyridine, 4-dimethylamino pyridine or 1,8-diazabicyclo(5.4.0)undecylenic-7-alkene. The mol. ratio of alkali to compound (III) is 1-30:1 under reflux temperature of - 80 degrees C for 1-72 hours to form compound (I). The acid is hydrochloric acid, sulfuric acid, phosphoric acid, perchloric acid, trifluoroacetic acid, trifluoroacetic acid, trifluoromethanesulfonic anhydride, methanoic acid, acetic acid, propionic acid, butyric acid, pentanoic acid, oxalic acid, hydrofluoric acid, hydrobromic acid, hydroiodic acid, para-toluenesulfonic acid, aluminum chloride, silica, triethyl chlorosilane, iodotrimethylsilane, lithium tetrafluoroborate, titanium tetrachloride, selenium tetrachloride or boron fluoride etherate. Preferred Definitions:    R1-R5=H, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tertbutyl, methoxy, oxyethyl, F, Cl, trifluoro-methyl or NO2l;    R7, R8=methyl formate, ethyl formate, methanoic acid, propylchloroformate, methanoic acid n-butyl ester, methanoic acid tertbutyl ester, methanoic acid sec-butyl ester or cyano.