Well i suppose you reduced it with borohydride, and it's the acetic acid you acidified with that remains? You could simply take up the nitropropane in some DCM and wash once with water and once with brine... That
should take care of the smell.
But is it that important to get rid of that last acetic acid? It shouldn't hurt anything if you just reduce the nitro right away!
edit: thought you said nitropropene and not -ane... sorry 'bout that.old postYou could wash it with a little cold water. It will immediately dissolve and clear out the remaining acetic acid. Otherwise a recrystallization from IPA will give you a very pure product which easily can be totally dried under a lightbulb for instance...
Heating the pure nitropropene is probably not a good idea, as the fumes are nastier than hey_man with a 15" gasoline-driven dildo in a kindergarden
end of old postRegards
Bandil