Topic > Norbornene Hydration Assay - 723

Theoretical weight was 599.6 mg. This produces a percentage yield of 3.7%. Table 1 also illustrates the experimental melting point of 99.3-102.1◦C. A melting point that has a range greater than 3◦C is indicative of impurities in the sample. Some impurity possibilities may have been unreacted norbornene and water. Evidence supporting the presence of unreacted norbornene in the final sample was the fact that the product had a gel-like structure. Norbornene itself has a gelatinous structure. However, once the norbornene reacted with the acidic catalyst (H2O2), it should have changed the chemical structure of the molecule and once the solution was brought back to room temperature, crystals should have formed. Since a gelatinous or oily product was present at the end of the reaction, this is indicative that unreacted norbornene was present in the sample. The second impurity that may have been present in the final product was water. Instead of adding 3 ml of baking soda and then 3 ml of brine, 3 ml of brine was added first and then 3 ml of baking soda. This experimental error caused excess aqueous solution to be added to the diethyl ether. Since excess water was added to the final product, approximately 4 times the amount of anhydrous sodium sulfate was required to remove the water from the product. This was another indication that there was too much water