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Grignard Reaction Lab
303 Words1 Page
The main purpose of this two- week experiment was to prepare the Grignard reagent, perform the Grignard reaction and then purify and characterize the triphenylmethanol. The Grignard reaction is a very important part of the reaction as it helps in the formation of the carbon carbon bond. The Grignard reagent, phenylmagnesium bromide, is a very strong Bronsted base and is therefore very highly reactive to water. Since this is the case, the reaction was performed in an airtight environment to ensure that the right reaction was performed and no side products such as a benzene ring was formed. Since phenylmagnesium is a very strong nucleophile, the reaction between phenylmagnesium and benzophenone could be performed under room temperature while
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Diels Alder Reaction
496 Words | 1 PagesThe percent yield of products that was calculated for this reaction was about 81.2%, fairly less pure than the previous product but still decently pure. A carbon NMR and H NMR were produced and used to identify the inequivalent carbons and hydrogens of the product. There were 9 constitutionally inequivalent carbons and potentially 4,5, or 6 constitutionally inequivalent hydrogens. On the H NMR there are 5 peaks, but at a closer inspection of the product, it seems there is only 4 constitutionally inequivalent hydrogens because of the symmetry held by the product and of this H’s. However, expansion of the peaks around the aromatic region on the NMR show 3 peaks, which was suppose to be only 2 peaks. In between the peaks is a peak from the solvent, xylene, that was used, which may account to for this discrepancy in the NMR. Furthermore, the product may have not been fully dissolved or was contaminated, leading to distortion (a splitting) of the peaks. The 2 peaks further down the spectrum were distinguished from two H’s, HF and HE, based off of shielding affects. The HF was closer to the O, so it experienced more of an up field shift than HE. On the C NMR, there are 9 constitutionally inequivalent carbons. A CNMR Peak Position for Typical Functional Group table was consulted to assign the carbons to their corresponding peaks. The carbonyl carbon, C1, is the farthest up field, while the carbons on the benzene ring are in the 120-140 ppm region. The sp3 hybridized carbon, C2 and C3, are the lowest on the spectrum. This reaction verifies the statement, ”Measurements have shown that while naphthalene and benzene both are considered especially stable due to their aromaticity, benzene is significantly more stable than naphthalene.” As seen in the reaction, the benzene ring is left untouched and only the naphthalene is involved in the reaction with maleic
Triphenylmethyl Bromide Lab Report
310 Words | 1 PagesSolid triphenylmethanol (0.200 g, 0.768 mmol) and sulfuric acid (2 mL) were added to a reaction tube, which was then ground using a glass rod until it dissolved and turned a dark orange color. The mixture was then added dropwise via a glass pipette into another reaction tube containing methanol (1 mL). An extra amount of methanol (2 mL) was used to transfer the rest of the contents of the first reaction tube. Formation of crystals was facilitated by scratching the side of the tube and adding additional methanol until the color changed to an off-white color. The contents of the tube were then vacuum filtered with water and the resulting crude product was weighed and then recrystallized using hot methanol to form triphenylmethyl methyl ether (0.051 g, 0.186 mmol, 24.2%). The melting point was 81 – 83˚
Grignard Reaction Lab Report
689 Words | 2 PagesThe purpose of this experiment involved synthesis of diphenylmethanol using phenylmagenisum bromide and benzaldehyde, using the method called Grignard reaction. Grignard reactions are an important method for new carbon-carbon bond formation as well as for the synthesis of alcohols.
Alkyne Groups
925 Words | 2 PagesThe goal of this lab is to exemplify a standard method for making alkyne groups in two main steps: adding bromine to alkene groups, and followed by heating the product with a strong base to eliminate H and Br from C. Then, in order to purify the product obtained, recrystallization method is used with ethanol and water. Lastly, the melting point and IR spectrum are used to determine the purity of diphenylacetylene.
Relative Reactivity of Anilines
508 Words | 2 PagesDiscussion and Conclusions: Interpreting these results have concluded that relative reactivity of these three anilines in order of most reactive to least reactive go; Aniline > Anisole > Acetanilide. Aniline, has an NH2 , the most active substituent , and adds to any ortho/para position available on the ring. This data is confirmed with the product obtained, (2,4,6 tribromoaniline, mp of 108-110 C). As for anisole, it has a strongly activating group attached, OMe an alkoxy group, and it added in two of the three available spots, both ortho. The results conclude: (2,4-Dibromoanisol mp 55-58 C ). Acetanilide has a strong activating group attached, acylamino group, but this group is large and the ortho positions are somewhat hindered so the majority of the product obtained added at the para position, results conclude: (p-bromoacetanilide mp 160-165 C). Since all the substituents attached to the aromatic rings were activators the only products able to be obtained were ortho/para products.
LAB Elimination Reactions Tested
1551 Words | 4 PagesPurpose/Introduction: In this experiment, four elimination reactions were compared and contrasted under acidic (H2SO4) and basic (KOC(CO3)3) conditions. Acid-catalyzed dehydration was done on 2-butanol and 1-butanol; a 2o and 1o alcohol, respectively. The base-induced dehydrobromination was performed on 2-bromobutane and 1-bromobutane isomeric halides. The stereochemistry and regiochemistry of the four reactions were analyzed by gas chromatography (GC) to determine product distribution (assuming that the amount of each product in the gas mixture is proportional to the area under its complementary GC peak).
Precipitation Reaction Lab
1333 Words | 3 PagesA precipitation reaction can occur when two ionic compounds react and produce an insoluble solid. A precipitate is the result of this reaction. This experiment demonstrates how different compounds, react with each other; specifically relating to the solubility of the compounds involved. The independent variable, will be the changing of the various chemical solutions that were mixed in order to produce different results. Conversely the dependent variable will be the result of the independent variable, these include the precipitates formed, and the changes that can be observed after the experiment has been conducted. The controlled variable will be the measurement of ten droplets per test tube.
Reaction Paper 2
1283 Words | 3 PagesGreta Christina eloquently puts into words something I know in theory, but can be hard to understand in practice in heterosexual relationships. In Are we having sex now or what? Christina details her record keeping of how many people she had sex with, and what she counted as sex. She talks about the limiting misconception of sex only being coitus, and other acts not “counting.” Christina writes of how when she started having sex with women her outdated system of what was sex and what was not sex was completely destroyed. By limiting sex to “penis in vagina,” Christina was discounting some of her favorite sexual experiances, and including ones she did not particularly enjoy.
Reaction Rate Investigation
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Enzyme Reaction Lab
435 Words | 1 PagesThe purpose of the experiment conducted is to understand the role of enzymes in maintaining life and to be able to identify and explain various factors that affect enzyme functions. Make sure to be wearing lab appropriate clothing, a lab coat, and safety goggles at all times since this experiment involves you handling dangerous chemicals like hydroxylamine. For this experiment one of the main materials needed is a spectrophotometer. The use of the spectrophotometer is very important in this experiment. You will test three concentrations of enzyme (0.5 ml, 1.0 ml, and 2.0 ml of turnip extract) and three concentrations of substrate (0.1 ml, 0.2 ml, and 0.4 ml hydrogen peroxide). You always need to make sure you have a control, the control in this experiment is the turnip extract and the color reagent guaiacol. Increasing the temperature increases the rate of an enzyme reaction, decreasing the temperature decreases the rate of an enzyme reaction. Denaturation is a process in which proteins or nucleic acids lose the quaternary structure, tertiary structure and secondary structure. Hydroxylamine is a colorless inorganic compound and an odorless white crystalline solid.
The Diels Alder Adduct
1739 Words | 4 PagesDiscussion The reaction of (-)-α-phellandrene, 1, and maleic anhydride, 2, gave a Diels-Alder adduct, 4,7-ethanoisobenzofuran-1,3-dione, 3a,4,7,7a-tetrahydro-5-methyl-8-(1-methylethyl), 3, this reaction gave white crystals in a yield of 2.64 g (37.56%). Both hydrogen and carbon NMR as well as NOESY, COSY and HSQC spectrum were used to prove that 3 had formed. These spectroscopic techniques also aided in the identification of whether the process was attack via the top of bottom face, as well as if this reaction was via the endo or exo process. These possible attacks give rise to four possible products, however, in reality due to steric interactions and electronics only one product is formed.
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871 Words | 2 PagesIn a small reaction tube, the tetraphenylcyclopentadienone (0.110 g, 0.28 mmol) was added into the dimethyl acetylene dicarboxylate (0.1 mL) and nitrobenzene (1 mL) along with a boiling stick. The color of the mixed solution was purple. The solution was then heated to reflux until it turned into a tan color. After the color change has occurred, ethanol (3 mL) was stirred into the small reaction tube. After that, the small reaction tube was placed in an ice bath until the solid was formed at the bottom of the tube. Then, the solution with the precipitate was filtered through vacuum filtration and washed with ethanol. The precipitate then was dried and weighed. The final product was dimethyl tertraphenylpthalate (0.086 g, 0.172mmol, 61.42%).
Endothermic Reaction Lab Report
359 Words | 1 PagesAn endothermic reaction is a chemical reaction in which heat from the surrounding air is incorporated into the reaksie.5 The equation Between baking soda and vinegar are: CH3COOH + NaHCO3 -> CO2 (g) + NaC2H302 (aq) + H20 (1 ) .The reaction releases carbon dioxide release that heat energy required het.Die heat taken from the ambient air that the container in which the reaction occurs cold maak.Die carbon dioxide the pressure / gas provided in gas soda gebruik.6Die temparatuur fall because new bonds are formed and why he so heat energy to take as he needs energy to form the new bonds touch the liquid colder it is still an endothermic reaction. When vinegar with baking soda reacts an endothermic reaction formed. The other equation is: HC2H302-1- NaHCO3 = CO2 (g) + NaC2H3O2 (aq) + H20 (1) .1 Baking soda (NaHCO3) is also known as natruimbikarbonaat. It is
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