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Experiment 12 3BL

Experiment 12 3BL - Ali A Esmaeili 7 February 2011...

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Ali A. Esmaeili 7 February 2011 Experiment 12 The Magtrieve Oxidation of 4-Chlorobenzyl Alcohol, A Solvent-Free Reaction Discussion: Experiment 12 illustrated various phase changes in the beaker that allowed the collection of a purified product. The sand bath first heated the reactants to a temperature higher than the melting point of 4-cholorbenzyl alcohol (70-72°C). This allowed the alcohol to liquefy and thus react with the Magtrieve. The oxidation of the 4- chlorobenzyl alcohol was caused by the Magtrieve and yielded the product 4- chlorobenzaldeyhyde. The temperature of the reaction was greater than the melting point of 4-chlorobenzaldehyde (44.5-46.2°C ) and aldehyde’s high vapor pressure both resulted in the aldehyde vapors evaporating and separating from the starting material. As soon as the aldehyde vapor reached the cold surface of the watch glass, it solidified into needle-like crystals. The deposition of the crystals from the vapor is largely contingent on the fact that the watch glass is kept at a low temperature. This drop in temperature lowered the energy of the vapor and game the perfect conditions for crystals to form.
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