You are doing a lot of experiments, thats good! One question, do you have an actuall reference on this exact compound you are trying to make? If not, you should probably get one, it can be a lot of time, money and effort wasted to try to make this compound, there is probably a very good method available. I am thinking about the last method, how do you isolate the product from DMSO-solvent? Do you plan to distill this or wash the DMSO out with water?