Experiment 3 comprised three reactions: formation of dimethyl tetraphenylphthalate, hexaphenylbenzene, and tetraphenylnaphthalene. All 3 reactions used tetraphenylcyclopentadienone as the diene to generate products with high aromatic stabilization. The first reaction was the formation of dimethyl tetraphenylphthalate. A cloudy white solid was formed with 31.1% yield. In This reaction dimethyl acetylenedicarboxylate was used as the dienophile with a Carbonyl group as the electron-withdrawing group. A resonance stabilized aromatic ring was formed ( favored rection). The nitrobenzene was used to facilitate the by acting as a high boiling solvent, dissolving both reactants, and thereby driving the Diels-Alder reaction. Refluxing moved this reaction further, forming an intermediate. The violet solution turned beige when forming a six-membered ring by losing carbon monoxide. This loss made the overall reaction irreversible. …show more content…
A white solid was formed as a product with 59.3% yield. In this reaction tetraphenylcyclopentadienone used as the diene, which was condensed with a highly reactive alkyne dienophile (diphenylacetylene). Heat was used to overcome the diene’s enhanced activation energy. The mixture turned dark brown indicated the loss of carbon monoxide, which made this reaction, overall, irreversible. The result was formation of a high yield hexaphenylbenzene which is more stable than the first product, The Reason is that the delocalized electrons in the rings give more stability to hexaphenylbenzene as compared to the dimethyl
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Testing phase finds differences in positive/negative documents by the centroid obtained in training phase by ranking each of them. The simple way to estimate similarity between documents and centroid by summing weights of patterns which are in the documents. VII. Experimental Results To determine accurate measures of similarity or difference between documents you depict results by graph pattern and table pattern. The experimental setup consists of relevant documents that you termed as positive and negative documents .i.e
The goal of this experiment was to isolate three different molecules (acidic, basic, and neutral) from a mixture and identify their molecular structure. This was accomplished by using acid/base liquid extraction and H NMR analysis. The neutral component of the unknown mixture #191 was fluorenone. This was evident due to an H NMR spectra that had a high presence of hydrogen signals in the 7.2- 7.7 ppm range. Chemical shift values for fluorenone stated in the lab manual were 7.27, 7.47, 7.48, and 7.6 (CITE), indicating that the corresponding H NMR spectra for the neutral unknown is of this chemical.
This lab only included double-replacement reaction which allowed for only one of 2 types of products. Products that chemically reacted (solid) or products that didn’t (aqueous). The insoluble products of these double replacement reaction occurred when the cations or anions of the reactant bonded with the cation or anion of the other reaction. When this happens the reactants get paired together with the reactant it bonded with and causes a replacement. This is shown evident in the lab in Station
This was proved by utilizing the IR spectrum to verify the C =O was not in the final product as it lacked the 1640 cm-1 peak. The melting point of 113-115 degrees C proved that the final product obtained was the E-Stilbene. The TLC plate proved that the E and the Z product was produced, show cased by the double intensity of the DCM spot to the final product’s spot, both which had an Rf of 0.92. The double intensity proved that both products were produced, but through heating and filtering, the Z-Stilbene was
The abundant of esters, which serves as the electron withdrawal group, propels the effectiveness of this reaction. In the present case, the central ring of the anthracene possesses the characteristic properties of a diene, electron-rich, system . Thus, this aromatic compound reacts with the 9 and 10 positions of the maleic anhydride dienophile, electron-poor, by 4 +2 cycloaddition . 9 and 10 are the position of preference because it is where new bonds can be made without destroying the aromatic formation of the other two rings. This reaction results in a six-membered ring bridged on the 9 and 10 positions of anthracene.
Purpose The purpose of this lab was to measure the temperature of a solution to see how much energy was gained/lose during the reaction between the NiCl2 and Ethylenediamine. In this experiment we were also finding how many Ethylenediamine will bind to Ni+2 in an aqueous solution. By measuring the change in evolved heat, it’s possible to find the maximum number of Ethylenediamine molecules that have attached to each ion. Procedure Gather materials Analytic Balance Pasco with temperature probe Styrofoam cup Tape 5 M Ethylenediamine 0.998 M NiCl2 10 mL Pipet 2 mL
Benzyne Formation and the Diels-Alder Reaction Preparation of 1,2,3,4 Tetraphenylnaphthalene Aubree Edwards Purpose: 1,2,3,4-tetraphenylnaphthalene is prepared by first producing benzyne via the unstable diazonium salt. Then tetraphenylcyclopentadienone and benzyne undergo a diels-alder reaction to create 1,2,3,4-tetraphenylnaphthalene. Reactions: Procedure: The reaction mixture was created. Tetraphenylcyclopentadienone (0.1197g, 0.3113 mmol) a black solid powder, anthranilic acid ( 0.0482g, 0.3516 mmol) a yellowish sand, and 1,2-dimethoxyethane (1.2 ml) was added to a 5-ml conical vial.
Flucloxacillin: - It is a member of the penicillin family that is used as an antibiotic for the staphylococcal infection (bacterial infection) that affects the human tissues of the skin and the lungs (pneumonia). It is also used in the treatment of food (rotten food) and poisoning of theblood. Staphylococcus may also be a risk to the human life if it releases its toxins by some strains of the bacteria to cause toxic shock. - Flucloxacillin is prescribed mainly in Australia & Europe, as it is very effective against the staphylococcus bacteria by inhibiting the synthesis of its cell wall then it will die. - Flucloxacillin is a ß-lactam antibiotic with a narrow spectrum.
Hucknall, David 2012, Chemistry of Hydrocarbon Combustion, Chapman and Hall, London 2. University of California, 2014, Index of Hydrogen Deficiency, viewed 13 August 2017, https://chem.libretexts.org/Core/Organic_Chemistry/Fundamentals/Index_of_Hydrogen_Deficiency_(IHD) 3. Brown, William 2017, Organic Chemistry, Cengage Learning, Dallas 4. Chapman, Brian 2003, Organic Chemistry, Energetics, Kinetics and Equilibrium, Thomas Nelson, Cheltenham 5. Solomons, Graham 2004, Organic Chemistry, J. Wiley & Sons, Tampa 6.
Nevertheless, the latter is not used in this experiment since it is very reactive and extremely flammable. On the contrary, NaBH4 is relatively mild and it can be used with protic solvents. In this manner, 1.507 grs of the ketone 9-fluorenone were mixed with 30.0 ml of 95% ethanol in a 125 ml Erlenmeyer flask. The bright yellow mixture was stirred during 7 minutes until all the components were dissolved.
One conformation placed the 4-tert-butyl substituent in most stable, locked the equatorial position with the carbonyl pointing up. Oxidation the 4-tert-cyclohexanol produced a greater amount of the more stable conformer with tert-butyl in the equatorial position relative to the conformer with tert-butyl in the un-favored axial position. The faces of 4-tert-butylcyclohexanone are non-equivalent for nucleophilic attack due to top –face steric hindrance imposed by a tert-butyl group in the equatorial position and the presence of much smaller, axial deuterium atoms adjacent to the carbonyl on the bottom-face of the
The possible explanations and changes to make are similar to the previous questions. Conclusion and Future Experiment 18. The identity of the product and unknown were 4-tert-butylbenzyl phenol ether and tert-butyl phenol respectively. The key to making this discovery was the melting point and TLC results!
Melting point data was used to confirm the identity of the product as diphenylacetylene. The expected melting point of diphenylacetylene is 59-61℃, according to its MSDS sheet. While there was a discrepancy in this temperature range and the melting point range observed, the melting point was significantly lower than that of meso-stilbene dibromide, which is 241℃. The data hence confirms the formation of diphenylacetylene. The error could have been caused due to impurities in the diphenylacetylene crystals, such as leftover ethanol, or triethylene glycol, which would destabilize the lattice structure of the crystal, making it melt at a lower temperature than expected.
There are two methods of obtaining cyclohexane. These two methods are fractional distillation of naphtha and hydrogenation of benzene. Research suggest that the hydrogenation of benzene is the most economical way to create our chemical of choice. According to ICIS, cyclohexane is used in the production of adipic acid used to
In this experiment, it was possible to produce the major products from bromination of acetanilide and aniline. 0.075g of 4-bromoacetanilide and 0.156g of 2,4,6-tribromoanilne were collected from bromination of 0.07g acetanilide and 0.05g aniline with the percent yield of 67.57% and 88.1% respectively. At the end of the experiment, to prove the formation of the major products, melting point of the products were measured. The melting point of the product from the bromination of acetanilide was 164.8-168.50c, which is in the range of the melting point of 4-bromoacetanilide, 165-1690c, as reported on the Chemical Book, CAS Database List (chemicalbook.com). The melting point of the product from the bromination of aniline was 119.8-121.90c, which is in the range of the melting point of 2,4,6-tribromoaniline, 120-1220c, as indicated on PubChem, Open Chemistry Database (pubchem.ncbi.nlm.nih.gov).