Hello,
First I don't speak english well. But, I think I'm ok to tell you my information needs. I'm not ok for make chromatographia (I think it's a method for verify na ?). Then on tihkal lsd article. He said "The residue was chromatographed over alumina with elution employing a 3:1 C6H6/CHCl3 mixture, and the collected fraction stripped of solvent under hard vacuum to a constant weight. This free-base solid can be recrystallized from benzene to give white crystals with a melting point of 87-92 °C. IR (in cm-1): 750, 776, 850, 937 and 996, with the carbonyl at 1631. The mass spectrum of the free base has a strong parent peak at mass 323, with sizable fragments at masses of 181, 196, 207 and 221." So can I bypass this line cuz I understand nothing and it's seems to be just a verification ? Thank very much !