The process for the production of tebuconazole starting from reaction of l-(4-chlorophenyl)-4,4 dimethyl pentan-3-one (alkyl ketone) with mixture of dimethyl sulphide and dimethyl sulphate in the presence of catalyst and potassium hydroxide, wherein the reaction mass is heated and cooked over a appropriate period to complete the reaction, wherein the mass is dissolved in water to remove salts, to separate organic layer and dimethyl sulphide is distilled out to get 2-(4-chlorophenylethyi)-2-tert.-butyi-oxirane. The residue (oxirane) is further reacted with 1,2,4 triazole in solvent medium of dimethyl sulpho oxide in the presence of sodium hydroxide and water, heated and cooked for a suitable time to get crude tebuconazole. dimethyl sulpho oxide is distilled and solid residue is dissolved in toluene, washed with water, cooled to crystallize, filtered and dried under reduced pressure. The yield of the product is 85% based on alkyl ketone with a purity of 98%.
