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Dehydration of 2-methylcyclohexanol To Yield an AlkeneIntroduction In the 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 12-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 substances1 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 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 The purpose of this experiment is to show how an alcohol can be dehydrated to yield an alkene and this is shown through the gas chromatography of the distillate However this technique is completely dependent on difference in polarity not difference in identity so this factor must be considered when separating and identifying components Table of ReagentsNameChemical formulaMeltingBoiling point CelsiusDensitygcm3Molecular WeightAmu2-methylcyclohexanolC7H14O-21166925114Phosphoric acidH3PO421415216898Calcium chlorideCaCl2782160021575WaterH2O010098181-methylcyclohexeneC7H120110817963-methylcyclohexeneC7H12010580396ProcedureThe dehydration of 2-methylcyclohexanol was done by first measuring out 2 mL of 2-methylcyclohexanol with a graduated cylinder then 1 mL of phosphoric acidH3PO4 was mixed thoroughly with the 2-MCH and placed in a simple distillation apparatus The flask containing the 2-MCH mixture was placed in a sand bath contained in a heating element and on the flask a condensing tube was connected and wrapped with a moist paper towel to ensure a low
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