[jimimissel90]

I have a fairly simple prep for an allylic oxidation using selenium oxide as a reagent and I was looking for advice in regards to clean up of the glassware, stirrer bar and rubber stoppers. Currently I filter the product along with selenium through a celite pad, which does a good job in removing the majority of the selenium. My problem is with the left over trace amounts that cover the stirrer bar, that for the life of me I can't seem to remove. There is also small amount on a rubber stopper and seems to have stained it black.

Any advice on cleaning the remaining selenium would much appreciated

[kriggy]

Maybe hydroxide bath to convert it into Na2SeO3 and wash with water? Probably should work

[jimimissel90]

I gave that a quick go the other week and left it overnight. I only used a 1M benchtop solution so I might concentrate that further. I'll try it again and leave it for the weekend. Thanks for the help

[wildfyr]

You could always try pirahna. or nitric acid. Toss the black rubber stoppers, they are disposable for a reason.

[química brasileira]

The best way to deal with unwanted elemental selenium is to threat it with Aqua regia solution, its the only thing that actually solubilizes it.

OR u can try to oxidize it with hypochloride