Someone attempted the bromination procedure in the following article:
https://www.thevespiary.org/rhodium/Rhodium/pdf/shulgin.2-amino-1-phenylbutanes.pdf (https://www.thevespiary.org/rhodium/Rhodium/pdf/shulgin.2-amino-1-phenylbutanes.pdf)
(you can find it at the bottom of the second column on page 161 - {page 8 of the pdf})
They found that it was impossible to follow the procedure exactly because of course the solutions in GAA are completely solid at -10C.
Anybody have any idea why the authors were able to do this at -10C?