Essay about Synthesis of Benzilic Acid - 1107 Words

Synthesis of benzilic acid from benzoin utilizing a multi-step reaction. Names: Arian Karim TA Name: Sayantan Das Lab Day amp; Time: Thursday 7:30-11:40 Lab Section #: Abstract The main purpose of this experiment was to synthesize benzilic acid from benzoin. This requires a multistep synthesis with benzyl as an intermediate product. The first step required HNO3 as an oxidizing agent and the second step required KOH and HCl. The percentage yields of benzil and benzilic acid were 59.5% and 21.9% respectively. The calculated melting point of benzil was 90.1-91.6 which suggested some impurities, but the MP of benzilic acid was 149.3-151.5 which suggested a pure yield. The IR further confirmed the identity of benzylic acid with two†¦show more content†¦The solution was then allowed to crystallize and the solid benzilic acid was dried, weighed, and used to obtain melting point and IR spectra. Results and Calculations: Figure 3: Part A Results | Mass of Reactant (g) | Theoretical Yield (g) | Mass of Crude Product (g) | Mass of Final Product (g) | % Yield | Theoretical Boiling Point (C) | Experimental Boiling Point (C) | 0.30 | 0.294 | 0.318 | 0.175 | 59.9 | 95 | 90.1-91.6 | Figure 4: Part B Results | Mass of Reactant (g) | Theoretical Yield (g) | Mass of Product (g) | % Yield | Theoretical Boiling Point (C) | Experimental Boiling Point (C) | 0.100 | 0.114 | 0.025 | 21.9 | 150 | 149.3-151.5 | Figure 5: Calculations | Part A: Benzoin to Benzil | | | | initial mass of benzoin | 0.30 g | | | MW of benzoin | 212.24 g/mol | | | | | | mol benzoin | = | mass / MW | | | = | .30 / 212.24 | | | = | 0.0014 | mol | | | | | MW benzil | = | 210.23 g/mol | | mass benzil | = | mol benzoin x MW benzil | | = | .0014 x 210.23 | | theoretical yield | = | 0.294 | g | | | | | actual yield benzil | = | 0.175 | g | % yield | = | actual/thr x 100% | | | = | .175 / .294 x 100% | | | = | 59.5 | % | | | | | Part B: Benzil to Bezilic Acid | | | initial mass of benzil | 0.10 g | | | MW of benzil | 210.23 g/mol | | | | | | mol benzil | = | mass / MW |Show MoreRelatedMultistep Synthesis of Benzilic Acid2109 Words   |  9 PagesMulti -Step Synthesis of Benzilic Acid from Benzoin Abstract: The main purpose of this experiment was to convert a secondary alcohol to a ketone, utilizing a mild and selective oxidizing agent. In addition, this converted alpha diketone was then subjected to rearrangement to a carboxylate salt, then acidification, to produce an alpha-hydroxyacid. In this experiment, benzoin was used and converted into benzil, which was then used to synthesize benzillic acid. The yields were not ideal: .081g of benzil-Read MoreEssay on Multistep Synthesis of Benzilic Acid2070 Words   |  9 Pagesobjective of the experiment was to prepare Benzilic acid by multistep synthesis starting with benzaldehyde. In this setup however, product of the first step, Benzoin, is provided thereby omitting the first step involving the conversion of benzaldehyde. For this experiment, the microscale techniques of reflux, crystallization, and melting-point determination were used. Utilizing these techniques a product yield of 93% for benzil and 57% for Benzilic acid was obtained, as well as a melting point rangeRead MoreMultistep Lab1416 Words   |  6 Pagesto Produce Benzilic Acid Abstract The objective of the lab was to produce benzilic acid from benzoin. Benzoin was successfully oxidized with nitric acid to form benzil. The percent yield of benzil was 59.26% and the melting point range was 94.1-95.5 °C. The literature melting point of pure benzil is 95 °C, which indicates the correct product was obtained. Benzil was then rearranged using potassium hydroxide to form benzilic acid. The percent yield of benzilic acid was 57.94%