60 u00b0 c 3 hydroxynitrostyrene 1 65 g prepared according to the process of the invention and n butylisocyanate 0 99 g were stirred in dry toluene 50 ml at room temperature to the stirred mixture was added triethylamine 0 5 ml and stirring continued for 4 hours at 85 u00b0 c the reaction mixture was concentrated the oily residue was crystallised from hexane to get pure title product m p 80 u00b0 2 u00b0 c u03b2 methyl 4 hydroxynitrostyrene 5 37 g prepared according to the process of the invention and sodium ethoxide 2 04 g were stirred in ethanol 20 ml at room temperature for 1 hour the solvent was removed at 40 u00b0 45 u00b0 c under reduced pressure and the residue was suspended in solvent ether and filtered to get the sodium salt of u03b2 methyl 4 hydroxynitrostyrene 5 2 g 2 chloro 5 nitrothiazole 4 28 g and the sodium salt of u03b2 methyl 4 hydroxynitrostyrene 5 2 g were mixed in dmso dimethysulfoxide 10 ml under cooling the mixture was warmed at 50 u00b0 55 u00b0 c for 2 hours the reaction mixture was diluted with cold water and the separated product was suspended in ethanol the crude product was crystallised from benzene hexane m p 102 u00b0 3 u00b0 c 4hydroxynitrostyrene 3 3 g and anhydrous potassium carbonate 2 76 g were stirred at.