Synthesis of Methyl Stearate
Synthesis of Methyl Stearate
The purpose of this lab was the convert liquid methyl oleate to solid methyl stearate by catalytic hydrogenation. Firstly, we produced hydrogen gas using solid mossy zinc and sulfuric acid. Using the hydrogen produced in the previous reaction, we were able to convert the liquid methyl oleate to solid crystals of methyl stearate. A mineral oil was also used to bubbler was used to maintain the hydrogen pressure slightly above the atmospheric pressure and to prevent back-diffusion of air into the system. An initial zinc mass of 2.1305g was reacted with 10ml of sulfuric acid. I added the 10ml of sulfuric acid in one and did not add small portions of it as time passed. This zinc-sulfuric acid system was connected to the methyl oleate flask which also contained the Pd/C catalyst. The methyl oleate had an initial mass of 2.352g. As time passed, the bubbles produced in the mineral oil system were too few per second. As a result, I added an additional mass of 1.2457g of zinc to the hydrogen generator. Throughout the reaction process, the round bottom flask containing the methyl oleate and the catalyst was placed in a warm water bath at 40 degrees Celsius.
After 45 mins, the reaction was stopped and the dark colored liquid in the round bottom flask was passed through a celite layer in order to remove the catalyst from the solution.
The part containing methyl compound was then transferred to an ice bath and allowed to crystallize after leaving it to cool to room temperature. The mass of the crystals was weighed to be 0.1203g. The percentage yield was calculated to be (0.1203/2.352) *100 = 5.11%.
A sample of the crystals was then taken and dissolved in around 1 ml of deuterated chloroform and the solution was transferred was transferred to an NMR tube. The NMR tube was handed to the lab TF and the NMR spectrum was received a few hours later.
Post-lab Conclusions
The percent yield calculated was around 5%. The percent yield of the white crystal
The purpose of this lab was the convert liquid methyl oleate to solid methyl stearate by catalytic hydrogenation. Firstly, we produced hydrogen gas using solid mossy zinc and sulfuric acid. Using the hydrogen produced in the previous reaction, we were able to convert the liquid methyl oleate to solid crystals of methyl stearate. A mineral oil was also used to bubbler was used to maintain the hydrogen pressure slightly above the atmospheric pressure and to prevent back-diffusion of air into the system. An initial zinc mass of 2.1305g was reacted with 10ml of sulfuric acid. I added the 10ml of sulfuric acid in one and did not add small portions of it as time passed. This zinc-sulfuric acid system was connected to the methyl oleate flask which also contained the Pd/C catalyst. The methyl oleate had an initial mass of 2.352g. As time passed, the bubbles produced in the mineral oil system were too few per second. As a result, I added an additional mass of 1.2457g of zinc to the hydrogen generator. Throughout the reaction process, the round bottom flask containing the methyl oleate and the catalyst was placed in a warm water bath at 40 degrees Celsius.
After 45 mins, the reaction was stopped and the dark colored liquid in the round bottom flask was passed through a celite layer in order to remove the catalyst from the solution.
The part containing methyl compound was then transferred to an ice bath and allowed to crystallize after leaving it to cool to room temperature. The mass of the crystals was weighed to be 0.1203g. The percentage yield was calculated to be (0.1203/2.352) *100 = 5.11%.
A sample of the crystals was then taken and dissolved in around 1 ml of deuterated chloroform and the solution was transferred was transferred to an NMR tube. The NMR tube was handed to the lab TF and the NMR spectrum was received a few hours later.
Post-lab Conclusions
The percent yield calculated was around 5%. The percent yield of the white crystal