thank you sir petr slavik for your attention. i already read this paper and fallow the procedure which is written here in this paper but i didn't get the pure product. may be i do some mistake so if you explain it for me more clearly the procedure written in this paper then i will try again to do it. thank you

sir if you done this reaction then please clear me about it that how you do it.

i take first the raw material and put in flask and then heat up up to 90 degree then i put bromine drop by drop and then stir for two hours at 58 degree . so is it correct@petr slavik