How to Write a Summary of an Article? In table format, provide the Rf values you recorded for each of the 3 compounds in Part I.
This is because during the reaction, a hydrogen from the borohydride first attaches onto the carbon in the carbonyl group of fluorenone which would leave the oxygen with a negative. In the presence of MeOH, the oxygen would be able to steal the hydrogen from the alcohol group on MeOH which would speed up the reaction as opposed to taking another hydrogen from another borohydride.
This experiment focused mainly on the technique of thin-layer chromatography TLC. Overall, the TLC went well since a general trend can be seen between the concentrations of the solvent and the time it takes for the reaction to finish across all data.
However, throughout individual data and even looking across the board, there are many outliers that did not fit this general trend. The main problem with the TLC technique is how it is difficult to obtain samples at exact times since it would take many seconds both before and after to obtain a sufficient amount of sample to spot the TLC plate.
In addition, sometimes the TLC was difficult to distinguish since either the dots were too large or too small and too close to the others around it.
Therefore, the technique of obtaining the right amount of sample to spot the TLC is also one that people would have to work on many times to master. The TLC technique can best be improved next time by having enough spotters prepared and getting an idea of how much sample to spot before spotting the sample.
TLC Plates The fluorenone and fluorenol samples serve as reference spots to determine when the reaction goes to completion. As the reaction proceeds, the spot at the fluorenone location diminishes whereas the spot at the fluorenol location darkens.
In the end when the reaction is complete, there is only a dark spot at the fluorenol. For the solvent solution with Across all lab data, the average time for this specific solvent solution was When looking at different concentrations of the solvent solution and comparing it to the time it takes for the reaction to goes to completion, the general trend is that as the concentration of MeOH increases, the reaction time decreases.
This is because during the reduction of fluorenone to fluorenol, a hydrogen from the sodium borohydride first attacks the carbon in the carbonyl group of fluorenone, leaving the oxygen with a negative charge. The oxygen is then protonated with another borohydride compound. If MeOH is present, this protonation can occur with the oxygen stealing the hydrogen from the hydroxide group on methanol.
This is more favorable since the oxygen in the hydroxyl group is highly electronegative which makes the hydrogen easy to remove.Tlc (Fluorene, 9-Fluorenol, 9-Fluorenone) Compounds: 9-fluorenone, 9-fluorenol. Fluorene Solvent: Ethyl acetate 10% in hexane, Ethyl acetate 25% in hexane, % hexane Polarity of each compound reacted differently to each of the solvents used.
As we know, ‘like’ interacts with ‘like’.
Fluorene has the least amount of polarity based. = Fluorenone, = Fluorene. Flask three was only supposed to have Fluorenone but this shows contamination of the other compound.
For a mixture of fluorene, fluorenone and -fluorenol is examined by TLC and gives the following Rf values: , , | Identify . ChEBI: A member of the class of hydroxyfluorenes that is 9H-fluorene substituted by a hydroxy group at position 9 (the non-aromatic carbon).
9-FLUORENOL Preparation Products And . Experiment REDUCTION OF 9-FLUORENONE. Objectives. To synthesize a secondary alcohol from a ketone using a sodium borohydride reduction. To purify and isolate the product using recrystallization. To analyze the purity of the product using TLC, HPLC and melting point analysis.
Electronic absorption, excitation and fluorescence spectra of fluorenone and 4-hydroxyfluorenone were recorded at room temperature in several aprotic solvent of varying polarities. It is well known that fluorenone possesses a closely lying excited state of different character,.
For the absorption spectra of 9Fl and 4HOFl, Eqs.
Fluorenol is an alcohol derivative of fluorene. In the most significant isomer, fluorenol or 9-hydroxyfluorene, the hydroxy group is located on the bridging carbon between the two benzene rings. Hydroxyfluorene can be converted to fluorenone by oxidation.