Chromatography

Tags: arene aromatic compounds benzene carbon atoms carbon bonds carbon hydrogen catalyst system hydrogen bond indole organic synthesis palladium science simple c university of ottawa university of ottawa canada

For those of you who are into organic synthesis. May 25th issue of Science published a paper by David R. Stuart and Keith Fagnou from University of Ottawa (Canada) – “The Catalytic Cross-Coupling of Unactivated Arenes”. They report that aromatic compounds can be coupled without having to preactivate the reactants. This method employs palladium and [...]

Tags: adsorbent adsorption benzene chalk powder chlorophyll chromatographic chromatographic column colorful mixture eluent green leaf History infinite number precipitate solid surfaces vapors

Captured by the surface of adsorbent’s solid body, molecules can transfer back into solution – eluent, and then again get adsorbed and so on, changing its state infinite number of times.

Tags: benzene chemical energy chlorophyll chromatogram colored bands glass tube greek words History light rays new science organic compounds remarkable discovery

Professor Tsvet filled a glass tube with finely ground powder of pure chalk, damped it with benzene, and then poured over a little bit of chlorophyll solution extracted from a fresh leaf. The very top layer of the powder was, of course, immediately colored green, and then Tsvet proceeded to slowly, drop by drop, add benzene, into the tube filled with chalk.