Heat propylene glycol with HCl/HBr and ZnCl2 or ZnBr2. Yields may be shite, but reagents are dirt cheap.
Or run condensed propylene into Bromine in DCM in a dry ice acetone bath until decolorized. That's substantially more complex, but if (and I so no
reason why it shouldn't) it works, you'll have clean product after stripping the solvent
You could just bubble the gas through an ice bath with the DCM and bromine but I suspect you'll blow away most of your bromine. You could try the same
at room temperature with GAA and bromine, but I suspect the same problem. perhaps you can put a nonreactive mesh in the reaction vessel to slow down
and break up the bubbles as much as possible so it can be done at room temperature.
[Edited on 12-3-08 by UnintentionalChaos]
Department of Redundancy Department - Now with paperwork!
'In organic synthesis, we call decomposition products "crap", however this is not a IUPAC approved nomenclature.' -Nicodem
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