Analysis Of Esters Lab Report

Part 1: Esters aromas are very distinct and often pleasant, they are often used in food aroma and fragrances.1 Esters chemical properties are distinguished by their low molecular weight and low boiling points, caused by their dipole-dipole and dispersion interaction.2 Esters are the result of a condensation reaction, in which a carboxylic acid, an alcohol, and an acid catalyst react to create a water molecule and an ester.

Solvent choice is important in Grignard reagent formation. The solvent must be non-reactive with a negatively charged carbon (ex. acetone or anything even slightly acidic), and the solvent cannot have a carbonyl group. The solvent must be a volatile solvent that provides a blanket of solvent over the reaction solution so that oxygen and moisture in the air are excluded from the reaction. Oxygen and moisture in the air are very slightly acidic and would disrupt the synthesis of a Grignard reagent. Anhydrous ether (R2O) is often used as a solvent in creating Grignard reagents because it keeps out water and oxygen, makes the

The cinnamic acid and methanol mixture was yellow and clear. .500 mL of concentrated sulfuric acid was slowly added to the mixture. The mixture was still yellow and clear. A reflux condenser was added to the flask. The mixture stirred for one hour: 3:44 pm- 4:44pm. During the hour of stirring, a TLC analysis was made. The substances compared was the recrystallized cinnamic acid, cinnamaldehyde, and aged cinnamon oil. The cinnamon oil was 6 weeks old. It was a yellow solid gel with a small amount of liquid. The oil has a slight cinnamon smell. The stationary phase was silica gel and the mobile phase was ethanol: hexane (2:6) and 2 drops of acetic acid. The cinnamic acid and cinnamaldehyde were diluted in acetone and the cinnamon oil was diluted in hexane. However, when analyzed, no compounds showed up under the UV light. It was realized by the lab professor that discarded, diluted acetone was used instead of just acetone. The cinnamic acid and cinnamaldehyde were diluted with the correct acetone and the TLC analysis was repeated. The solvent front was 4.32 cm Under the UV light, the compounds were shown and circled with a pencil. The TLC plate was dipped into a vanillin stain and heated above a hot

In this experiment, the Fischer Esterification of an unknown acid and an unknown alcohol was used to prepare an unknown ester. Sulfuric acid was used as a catalyst in the reaction which then was put under reflux. After cooling, the pH of the solution was raised to approximately 8 using sodium carbonate. Diethyl ether was added, then the aqueous layer was removed and the organic layer was washed with sodium chloride. The aqueous layer was removed again and sodium sulfate was added. The unknown product was then identified using gas chromatography (GC) to obtain the retention time.

This reaction is spontaneous for almost all esters but can be very slow under typical conditions of temperature and pressure. The reaction occurs at a much faster rate if there is a significant amount of base (OH-) in the solution. In this lab experiment, the rate of this reaction will be studied using an ester called para-nitrophenyl acetate (PNA), which produces an alcohol,

The experiment began by mixing the initial 1.775g isopentyl alcohol with 2.3 mL acetic acid and about 5 drops sulfuric acid. This reaction mixture was then heated under reflux for an hour after boiling of the reaction mixture began.

To prepare and purify an ester: 1-pentyl ethanoate, using pent-1-ol and ethanoic acid. An annotated reaction showing this reaction is shown below:

Purpose: The purpose of the experiment was to perform the acid-catalyzed Fischer Esterification of acetic acid and isopentyl alcohol to form isopentyl acetate, or banana oil, which is used in flavor industries. The equilibrium of the reaction was changed by adding an excess amount of acetic acid. The reaction was refluxed and product was purified by extraction and distillation. Isopentyl acetate was analyzed by infrared spectroscopy and 1H NMR spectroscopy.

An ester was synthesized during an organic reaction and identified by IR spectroscopy and boiling point. Acetic acid was added to 4-methyl-2-pentanol, which was catalyzed by sulfuric acid. This produced the desired ester and water. After the ester was isolated a percent yield of 55.1% was calculated from the 0.872 g of ester recovered. This quantitative error was most likely due to product getting stuck in the apparatus. The boiling point of the ester was 143° C, only one degree off from the theoretical boiling point of the ester 1,3-dimethylbutyl, 144 ° C. The values of the

Ester is a molecule, present in anabolic steroids that determine the life of the steroid by 50% and solubility in the blood stream. The presence of Ester molecule is shorter in Deca as compared to NPP. Shorter ester is very beneficial, but most of the people are not aware of this modern compound. Some people find it

In this experiment, a Fischer Esterification reaction was performed with two unknown compounds. The unknown compounds, Acid 2 and Alcohol D, were identified by using the knowledge of the reaction that took place, and the identity of the product that was synthesized. The identification of the product resulted from analysis of IR and NMR spectra.

In the last decades sucrose esters have attracted considerable interest by researchers, due to the vast applicability of these products in several industrial areas, such as in plant tissue culture [1], in cosmetic formulation to make most of the high-performance ingredients [2], in formulations of banana aroma in food and beverage flavoring industry [3], in microemulsion for synthesis of WO3 in nanoscale [4], in inhibition of bacterial growth such as inhibition of Streptococcus sobrinus for application in oral-hygiene products aimed at disrupting plaque formation and preventing caries [5]. Despite these interesting applications, sugar esters present much more important applications in advanced technologies, such as in nanomedicine and in cancer

Ethylene glycol is used: in the production of polyester fibers, PET resins, alkyd, unsaturated polyester, safety explosives, glyoxal, cosmetics and synthetic waxes ; as a chemical intermediate (NIOSH, 1995); as a component of automotive antifreeze, coolants, and hydraulic fluids (ATSDR, 2007a); as a de-icing agent; as a heat transfer fluid in heating and cooling systems and solar energy systems (ATSDR, 2007a); as an industrial humectant (NIOSH, 1995); as a solvent in ink, stains, pesticides, fire extinguishers, foams, polishes, adhesives, and electrolytic condensers (ATSDR, 2007a); as a desiccant to remove water from natural gas; as a

The purpose of this lab was to synthesize the ester isopentyl acetate via an acid catalyzed esterification (Fischer Esterification) of acetic acid with isopentyl alcohol. Emil Fischer and Arthur Speier were the pioneers of this reaction referred to as Fischer Esterification. The reaction is characterized by the combining of an alcohol and an acid (with an acid catalyst) to yield and ester plus water. In order to accomplish the reaction, the reactants were

Esters are organic molecules that have strong, pleasurable smells and can be found in an organic and inorganic