Tetraphenylcyclopentadienone PDF

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Tetraphenylcyclopentadienone

NAME: Mareh Altayar Howard Community College DATE: March 23rd, 2021

Objective: To use benzil in synthesizing Tetraphenylcyclopentadienone Chemical Index:

Chemical Reaction:

Procedure: 1. In a reaction tube, combine 42 mg of pure benzil (benzoin-free), 42 mg of 1,3diphenylacetone, and 0.4 mL triethylene glycol, washing the tube walls with the solvent. 2. Put the tube over a hot sand bath, place a thermometer in the solution, and heat it until the benzil is dissolved. 3. Remove the tube from the heat and add 0.20 mL of a 40 percent solution of benzyltrimethylammonium hydroxide in methanol to the solution with a 1-mL syringe. if the solution's temperature exceeds precisely 100°C To combine, stir once.

4. run it under cold water to cool it off. Collect the product after adding 0.5 mL of methanol and cooling the tube in cold. 5. Pick the crystals and wash them in cold methanol until they are purple-pink in colour.

Data & Calculations: Diphenylacetone = 0.042 g Benzil = 0.042 g Triton B = 10 drops ( about 0.5 ml) MeOH = 1.5 ml Water = 1 ml Funnel mass = 7.7331 g Funnel + product = 7.8180 g Product (Tetraphenylcyclopentadienone) = 0.0849 g Limiting reactant: Mass of Diphenylacetone/ M.W of diphenylacetone = 0.042 g / 210.27 g/mol = 0.00019974 mol ( limiting reactant ) Mass of Benzil / M.W of benzil = 0.042 g / 210.23 g/mol = 0.00019978 mol Theoretical yield: 0.00019974 mol / 384.5 g/mol = 0.0768 g Percent yield = (0.0849 g / 0.0768 g) X 100 = 110.55 % Dicussion: Benzil and diphenyl acetone are dissolved in a very high-boiling solvent and then treated with a solid organic base in this experiment. The crystallized substance is extracted and washed in methanol. It can be recrystallized from a high-boiling solvent if necessary. After a thorough analysis of the experiment findings, it is clear that the substance is not pure, as shown by a comparison of the percent yield versus the predicted percent yield, product color, and a comparison of the experimental melting point versus the literally melting a measured percent yield 110.55 percent is greater than the predicted percent yield of 100 percent. This is more likely due to

impurities in the final product, which would raise the final weight of the product and skew the percent Hill higher than it could be for a pure product, as well as lower the melting point of the product. The color of the product was therefore closer to a pinkish color, while a pure product would be more purely purple....