2311 lec 11 - DEHYDRATION REACTION OF 2-METHYL-2-BUTANOL...

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DEHYDRATION REACTION OF 2-METHYL-2-BUTANOL & STUDY BY GAS CHROMATOGRAPHY OH CH 3 H 3 C CH 2 CH 3 CH 3 CH 3 heat + 2-methyl-2-butanol bpt 102 o C 2-methyl-1-butene bpt 31.2 o C 2-methyl-2-butene bpt 38.6 o C H 2 SO 4 + water
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Key Concepts Question – Which is the major product and what is the ratio of 1-butene to 2-butene?? Reaction is Equilibrium –Use Fractional Distillation to remove products and shift equilibrium to the right Ratio Analyzed Gas Chromatography (and 1 H NMR)
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Experimental Tips Caution – H 2 SO 4 Caution – low bpts! Keep COLD! Joints sealed for distillation Minimum amount drying agent decant
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Fractional Distillation Mohrig Chapter 11 Used for mixtures of liquids with boiling points within 50 - 60 o C of each other Add fractionating column to simple distillation to allow multiple vaporizations- condensations Theoretical plates is the number of vaporizations-condensations.
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2311 lec 11 - DEHYDRATION REACTION OF 2-METHYL-2-BUTANOL...

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