is incorporated the reactant is heated under reflux overnight after cooling alcohol is incorporated the reactant is vacuum filtrated after drying a white solid of m4 4 50 g is obtained the yield is 97 preparation of a conjugated compound p1 having phenoxathiin the reaction is as below under nitrogen m1 1 06 g 3 5 mmol 15 ml of n n dimethyl n u2032 vinyl urea cui 0 56 g potassium carbonate 1 40 g 3 6 di t butyl carbazole 1 17 g 1 2 equ and 18 crown 6 0 21 g are incorporated into a 100 ml three necked flask the reactant is stirred under 160 u00b0 c so as to undergo reactions for 24 hours the solution is extracted by dichloromethane the organic phase is collected and then dried by anhydrous magnesium sulfate then a vacuum filtration process is performed the solvent of the filtered solution is removed by vacuum filtration after separated by column chromatography a white product is obtained after drying a high purity product is obtained by sublimation under vacuum condition 0 995 g yield 57 preparation of a conjugated compound p2 having phenoxathiin the reaction is as below under nitrogen m2 1 08 g 3 5 mmol 15 ml of n n dimethyl n u2032 vinyl urea cui 0 56 g potassium carbonate 1 40 g 3 6 di t butyl carbazole 1 17 g 1 2 equ and 18 crown 6 0 21 g are incorporated into a 100 ml three necked flask the reactant is stirred under 160 u00b0 c so as to undergo reactions for 24 hours the solution is extracted by dichloromethane the organic phase is collected and then dried by anhydrous magnesium sulfate.