GENERAL BIOLOGY BIOL 1001
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This 3 page Class Notes was uploaded by Charles Kohler on Tuesday October 13, 2015. The Class Notes belongs to BIOL 1001 at Louisiana State University taught by D. Homberger in Fall. Since its upload, it has received 8 views. For similar materials see /class/222809/biol-1001-louisiana-state-university in Biological Sciences at Louisiana State University.
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Date Created: 10/13/15
Calculations 0309g l4Dimethoxybenzenel mol138 l7gl mol productl mol25037g1 mol 56lelg product 05mL tbutyl alcohol079glmLl mol7412gl mol product2 mol25037g1 mol 667elg product 1 4Dimethoxybenzene is the limiting reactant The theoretical yield is 0561 grams The experimental yield was 0325 grams Percent yield 0325g056lg100 5793 yield Results and Discussion When the sulfuric acid was added to the original solution the mixture turned yellow and heated up a little When it was allowed to warm to room temperature the mixture crystallized and became a yellowbrown After the completion of the recrystallization and synthesis of the FriedelCrafts product the resulting calculated percent recovery ofthe sample was measured to be 5793 yield l4Ditbutyl25 dimethoxybenzene The calculated theoretical yield was 0561 g while the experimentally obtained yield was 0325 g The product crystals were of an offwhite color and had a powder structure However this powder was not as ne as those from previous experiments The melting point was determined using a MelTemp and was found to be 6775 C There were several sources of error throughout this experiment that contributed to the 5793 yield When the contents of the ask were transferred to the Buchner funnel for suction ltration a lot of the crystals stuck to the sides of the ask Additionally a lot of crystals stuck to the sides of the beaker after the crystals were recrystallized from ethanol Finally some crystals stuck to the lter paper during the weighing process The suction ltration process during this experiment was somewhat inef cient due to the fact that the resulting crystals were fairly moist This suggests that a reasonable amount of impurities were left in the product and this was con rmed due to the lowered and widened melting point range in comparison with the literary value of 104105 C The reaction mechanism for the alkylation reaction used to produce l4ditbutyl25 dimethoxybenzene is shown below Conclusion After completion of this experiment it was determined that the percent yield of this reaction was 5793 This percent yield seems reasonable for this experiment since there were many sources of error Due to the fact that two suction ltrations were performed there was a high chance that some product could have been lost In addition the meting point of this sample was determined to be 6775 C and thus contained impurities Another important electrophilic aromatic substitution reaction the FriedelCrafts alkylation was learned as a result of this experiment Answers to Questions 1 Yes it would be possible to form 14ditbutyl25dimethoxybenzene by treating l 4dimethoxybenzene with a four carbon alkene and sulfuric acid The reaction of an alkene with sulfuric acid would end would add a hydrogen to the less substituted carbon of the double bond and form the tertbutyl carbocation Any reaction that generates this carbocation can be used instead of using an alkyl halide 2 The product would have been l4dicyclohexyl25dimethoxybenzene if cyclohexanol had been substituted for tbutyl alchol 3 The product of the reaction would have been l2ditbutyl35dimethoxybenzene if 13dimethoxybenzene had been substituted for 14dimethoxybenzene
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