free base是什么意思? The<FONT color=#f70909> free base</FONT> could be azeotropically dried more reproducibly than the salt. The salt could be<BR><FONT color=#ff0000>free-based</FONT> in toluene with aqueous sodium hydroxide followed by distillation<BR>of toluene and additional drying by stripping with two more additions<BR>of toluene. This procedure gave 0.1-0.2% water levels in the bulk<BR>reproducibly. For tosylate salt lots with sufficiently low water levels, no<BR><FONT color=#ff0000>free-basing</FONT> was performed.查看更多2个回答 . 1人已关注