5B Dehyrdation and Analysis of an Alkene Mixture by GC

5B Dehyrdation and Analysis of an Alkene Mixture by GC -...

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Introduction In this experiment, the product mix of the dehydration of 2-methylcyclohexanol was analyzed using gas chromatography. There were two possible products for this reaction, as indicated by the following mechanism: A 1,2-hydride shift is also possible but does not occur at a statistically significant level. The composition of the mixture was determined using gas chromatography. This technique uses the difference in affinity for a stationary phase to separate substances. The mobile or carrier phase is typically helium, but nitrogen or any inert gas can be used. The carrier phase moves the components of the mix along the stationary phase, and due to affinity differences, the different components are carried through at different rates. As
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each substance elutes from the column, it passes through a detector that produces an electronic signal which is recorded by a chart recorder to produce a chromatogram. The time that elapses between insertion into the injection port until a component elutes from a column is called retention time; the differences in retention times can be used to hypothesize the relative amount of difference components in a mixture. However, this
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5B Dehyrdation and Analysis of an Alkene Mixture by GC -...

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