result of pratical 2 organic.docx

21 considering the percent of the yields the reaction

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The percentage purity for this experiment was 21.21%. Considering the percent of the yields, the reaction was not efficient. One of the reason behind that some of the product was remained or stick on the flask when transferred to the vial. When mixing of cyclohexanol with concentrated phosphoric acid will initiate the E 1 mechanism. The hydroxyl group, OH is not a good leaving group. Under acidic condition, a proton rapidly transferred to alcohol OH and the -OH 2 + group produced as good leaving group. The water molecule cleaved off to form intermediate carbocation. Phosphoric acid act as catalyst for protonated cyclohexonal has been oxidised to dihydrogen phosphate ion due to losing the hydrogen. The water molecule deprotonated the carbocation to give alkene and a hydronium ion. Cyclohexene has lower boiling point compared to cyclohexanol so it will distill out into the receiving flask to maximize the product. Phosphoric acid will not affect overall stoichiometry and used for additional reaction until all of the cyclohexanol is gone. When the cyclohexene tested by the bromine solution, it will remain colourless and showed a positive test in this experiment. Precaution Concentrated phosphoric acid solution is very corrosive to tissue so must handle carefully. If your skin contact to the phosphoric acid, wash the contaminated area with water and soap immediately. Wipe up all the spills by using sodium bicarbonate in the hood. Cyclohexanol can cause corrosive to the skin and affect respiratory system. Cover the receiving flask and put nearer to the distillation adapter to prevent breathe the vapours and contact to skin. Cyclohexene has gasoline smell. Cover the container of this compound and don’t leave any compound lying on the table.
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  • Fall '16
  • Mole, Phosphoric acid

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