text: tbscl protection of primary alcohol...problems...? i just protected a primary alcohol with tbscl, using that and tea, and cat. dmap.  now i have this white ppt that floats around in the solution and no matter what i do i can't seem to get rid of it. i thought about pulling it off on a column, but that'll probably just deprotect the alcohol and send me back to square one.  any suggestions???? gravity filtration, or vacuume filtration.    if vacuume then rinse the percipitant in something it won't dissolve in and also something that won't deprotect your alcohol.  then simply discard it and save the filtrate.