Opsomath: I was thinking about it but sodium sulfite is not stable in acidic enviroment so I would need to use more molar amounts of sulfite thatn acetic acid and that would be huge amounts. It might be worth trying. Im following published procedure and I get some precipitate when replicating their work from ARKIVOC 2011 (ii) 127-136 bunt im trying to make a compound 3 (and then 4) where R=Cl.
Dan: I tried mixture (to be exact, dissolve in MeCN and then add water) but the SM precipitated anyway. I dont have my lab notebook with me but as far as I remember, the MeCN and water mixture gave me about 20% conversion and 5% other impurities, the rest is starting material so it might be way to go but I have no idea how to further improve it. I didnt try tButylNitrite, Im not sure if we have it in a lab but thats good idea. Is it soluble in organic solvents?
pgk: thans for article, I´ll read it as soon as I can