Experiment 7discussion and results

It occurred because hexanes is a strong polar

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precipitate. It occurred because hexanes is a strong polar molecule which means that the polar unreacted diol is not dissolved. The precipitate was then filtered out using a pipette filter. Heating the mixture allowed for the collection of cyclic acetal. However, it had to be in its crystal form. This was done by placing the vessel containing the acetal in an ice-bath. The vessel was scratched with a scapula to induce the recrystallization process. The final product that was obtained was 0.35 g. However, the theoretical yield was 0.42 g resulting to only 83.33% yield. Results Experiment 6 Part A: Oxidation of p-nitrobenzyl alcohol Compound Mass(g) Percent yield Melting Point Range Literature M.P Appearance p-nitrobenzoic 0.82 70% 223-236 o C 237-240 o C Yellow
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acid crystal Experiment 6 Part B: Reduction of diketone using Na 2 BH 4 Compound Mass (g) Percent yield Melting point Range Literature M.P Appearance 1,2-diphenyl- 1,2-ethandiol 0.35 34.31 % 136-137 o C 137-139 o C White crystals Experiment 7: Preparation of Cyclic Acetal Compound Mass (g) Percent Yield Melting Point Range Literature M.P Appearance (4R,5S)-2,2- dimethyl -4,5- diphenyl-1,3- dioxolane 0.35 g 83.33% 69-72 o C 76-80 o C White crystals
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