10.4 Preparing Alkyl Halides from Alkenes: Allylic Bromination
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Diels-Alder Visualization Several computer animations of a Diels-Alder reaction that were created as an undergraduate student project are presented.
Addition Reactions |
Alkenes
Addition Reactions of Alkenes The Diels-Alder reaction, addition of oxygen to tetrakis(N, N-dimethylamino) ethylene, polymerization of ethylene, and addition of iodine to a-pinene are demonstrated. Molecular models of ethene are shown.
The Evolution of a Green Chemistry Laboratory Experiment: Greener Brominations of StilbeneLallie C. McKenzie, Lauren M. Huffman, and James E. Hutchison We describe two new greener alkene bromination reactions that offer enhanced laboratory safety and convey important green chemistry concepts, in addition to illustrating the chemistry of alkenes. The two alternative reactions, one involving pyridinium tribromide and a second using hydrogen peroxide and hydrobromic acid, are compared to the traditional bromination of stilbene through the application of green metrics, including atom economy, percent experimental atom economy, E factor, and effective mass yield. McKenzie, Lallie C.; Huffman, Lauren M.; Hutchison, James E. J. Chem. Educ.2005, 82, 306.
Synthesis |
Green Chemistry |
Aromatic Compounds |
Addition Reactions |
Alkenes
A Substitute for “Bromine in Carbon Tetrachloride”Joshua M. Daley and Robert G. Landolt Benzotrifluoride (BTF) is a suitable solvent substitute for carbon tetrachloride in experiments requiring application of bromine (Br2) in free radical or addition reactions with organic substrates. A 1 M solution of Br2 in BTF may be used to distinguish hydrocarbons based on the ease of abstraction of hydrogen atoms in thermally or light-induced free radical substitutions. Efficacy of minimization of solvent use, by aliquot addition to neat samples, has been established. Daley, Joshua M.; Landolt, Robert G. J. Chem. Educ.2005, 82, 120.
