CHE_LAB7(GC+DeH)

CHE_LAB7(GC DeH) - Alcohol Dehydration for the Synthesis of Alkenes and Analysis by Gas Chromatography Experiment 7 Purpose By an elimination

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Alcohol Dehydration for the Synthesis of Alkenes and Analysis by Gas Chromatography Experiment # 7
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C H 3 CH 3 OH CH 3 C H 3 CH 3 CH 2 Minor ~ 10% Major ~ 90% 90% Purpose By an elimination reaction, 2-methyl-2-butanol will dehydrate to create the isomeric alkenes: 2-methyl-1-butene and 2-methyl-2-butene. The alkene products of the dehydration will be purified by simple distillation technique and examined under gas chromatography. Gas chromatography will separate the compounds and its analysis will reveal major and minor products as well as physical properties such as the stability, volatility, and polarity of the alkenes. The general reaction follows: + + Heat 2-methyl-2-butanol 2-methyl-1-butene 2-methyl-2-butene Results and Discussion The products of the dehydration reaction were distilled by simple distillation. The mass of the product was recorded as 0.670g. Since the original sample of the alcohol was 1mL (0.805g), the theoretical yield was calculated as 0.641g for both isomers together. The rest of the mass should be lost by water. The complete % yield of the product was calculated as an unreasonable 104.5%. It was concluded that the mass was incorrectly recorded due to unwanted water and other compounds in solution. Also, the tared vial may have been wet from the ice bath adding weight to the measurement. The identity and purity of the compound can be supported by the distillation. The actual range of the distillation was between 31 – 45º C. The boiling points indicated by literature of the alkenes were 31.16º C and 38.57º C for 2-methyl-1- butene and 2-methyl-2-butene, respectively. The only other components of the solution were sulfuric acid and water which boil at much higher temperatures. Thus, since the distillation was
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This note was uploaded on 05/25/2008 for the course CHE 276 taught by Professor Totah during the Fall '07 term at Syracuse.

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CHE_LAB7(GC DeH) - Alcohol Dehydration for the Synthesis of Alkenes and Analysis by Gas Chromatography Experiment 7 Purpose By an elimination

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