All observations made throughout the lab should be noted, including any color changes that occur throughout each reaction as well as the time it takes for each change to occur and the temperature at which each reaction occurs. The amount of each reagent used should also be recorded and the expected yield should be calculated as well as the percent yield for the experiment. Then an analysis of the final product using proton NMR as well as IR should be performed to determine the purity of the final product (melting/boiling point can also be used) and if possible any possible side products that may have been produced should also be identified.
Introduction:
A catalyst is a compound that increases the rate at which a reaction occurs and …show more content…
Bubble H2 gas through the solution for a few minutes; the solution will turn pale yellow as the dihydride complex RhCl(P(C6H5)3)3H2 will form. Concentrate the solution under the flow of H2 gas, When the solution is sufficiently concentrated (almost 0.2 mL), add deoxygenated diethyl ether dropwise until precipitation occurs. Cool the flask in an ice bath and collect the light yellow crystals by filtration. Calculate the percent yield and obtain the IR spectrum7. Assign the peaks in the infrared spectrum. Then record the identifyinh NMR peaks found through NMR …show more content…
Add 10 mL of toluene to the flask and saturate it with H2 gas by bubbling for 10 min. Quickly remove the septum and add 25 mg of Wilkinson’s Catalyst to the solution and dissolve the catalyst in the solvent while stirring. Keep flushing the system with H2 while the cap is off (The Rh complex (dark red) is not very soluble in toluene, but the dihydride complex (pale yellow) dissolves completely). Then add 1 mL of freshly distilled cyclohexene dropwise with a syringe. As soon as the alkene is added, the solution will turn deep red-brown in color. Reattch the septum and flush the flask with H2 gas, the color of the solution will lighten to pale yellow (If the H2 gas flow is stopped and stirring is discontinued even for 30 seconds, the solution will turn deep red-brown again). After 15 min discontinue the flow of H2 gas and stop stirring. Then a proton NMR shoudl be taken of the product to determine if cyclohexane has been formed as a
Introduction:
A catalyst is a compound that increases the rate at which a reaction occurs and …show more content…
Bubble H2 gas through the solution for a few minutes; the solution will turn pale yellow as the dihydride complex RhCl(P(C6H5)3)3H2 will form. Concentrate the solution under the flow of H2 gas, When the solution is sufficiently concentrated (almost 0.2 mL), add deoxygenated diethyl ether dropwise until precipitation occurs. Cool the flask in an ice bath and collect the light yellow crystals by filtration. Calculate the percent yield and obtain the IR spectrum7. Assign the peaks in the infrared spectrum. Then record the identifyinh NMR peaks found through NMR …show more content…
Add 10 mL of toluene to the flask and saturate it with H2 gas by bubbling for 10 min. Quickly remove the septum and add 25 mg of Wilkinson’s Catalyst to the solution and dissolve the catalyst in the solvent while stirring. Keep flushing the system with H2 while the cap is off (The Rh complex (dark red) is not very soluble in toluene, but the dihydride complex (pale yellow) dissolves completely). Then add 1 mL of freshly distilled cyclohexene dropwise with a syringe. As soon as the alkene is added, the solution will turn deep red-brown in color. Reattch the septum and flush the flask with H2 gas, the color of the solution will lighten to pale yellow (If the H2 gas flow is stopped and stirring is discontinued even for 30 seconds, the solution will turn deep red-brown again). After 15 min discontinue the flow of H2 gas and stop stirring. Then a proton NMR shoudl be taken of the product to determine if cyclohexane has been formed as a