The objective of this two-part experiment was to in Part I, create 4-tert-butylcyclohexanone via oxidation of 4-tert-butylcyclohexanol to provide a source of ketone for reduction procedures. Part II of the experiment was conducted preforming a series of reduction reactions in effort to asses the diastereoselectivity of aluminum isopropoxide (MPV reduction), sodium borohydride (NaBH4), and L-selectride when reacted with 4-tert-butylcyclohexanone. The methods used for analysis were TLC, IR, and 1HNMR spectroscopy. An oxidation of 4-tert-butylcyclohexanol was conducted to produce the ketone, 4-tert-butylcyclohexanone using oxidizing reagent, sodium hypochlorite in glacial acetic acid solvent. Glacial acetic acid was used to provide an acidic environment to drive the reaction into equilibrium. Also, glacial acetic acid reacts with the oxygen of sodium hypochlorite to form a compound with a partial positive charge on chlorine. Sodium hypochlorite in the presence of glacial acetic acid (pKa~4.5) accomplishes a rapid equilibrium due to the nucleophilic nature of oxygen’s lone pair on the acidic protons of glacial acetic acid. The unusual cationic character of chlorine provided the source of oxidant [Cl+]. Chlorine underwent nucleophilic attack by the hydroxyl group of …show more content…
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
C4564 Description: IC50: 3-AP is a ribonucleotide reductase inhibitor and iron chelator with antitumor activity. Ribonucleotide reductase, the rate-limiting enzyme for de novo DNA synthesis, is an excellent target for chemotherapy. Its increased activity in cancer cells is associated with malignant transformation and proliferation.
Test such as Bromination, IR spectroscopy, refractive index, and measures physical properties confirmed that the product collected was the desired product, cyclohexene. A bromination
Unknown compounds verification Introduction: In Project 3 we are going to test an unknown compound and there are several different ways that can help us to identify the Unknown substance. And there is some pre-lab information that found in the internet. By Experiment 3: Identification of a Substance by Physical Properties “Every substance has a unique set of properties that allow us to differentiate one from another. These properties can be classified as either physical properties or chemical properties.
For example, a lone pair from the oxygen in naphtholate anion attacks the carbon that is bonded to bromine from an allyl bromide molecule. This creates a partial C-O bond and a partial broken C-Br bond, then the C-O bond fully bonds
A control was used to compare the reactant and the product, showing a clear appearance that would indicate an alkene being present. Bromine was added to the reactant 4-methylcyclohexanol, and a reddish-brown color appeared, indicating that no reaction took place. Bromine was then added to the product 4-methylcyclohexene, and the clear appearance of the product remained, concluding that an alkene is indeed present. Discussion Given the results obtained post-experiment, the percent yield was calculated to be about 35.5%, which may suggest that either product was lost at some point during the experiment, or side product was formed.
The initial reaction mixture containing ferrocene, acetic anhydride, and phosphate acid was mixed on a hot stir plate. During this period, reflux was observed, and the mixture appeared dark brown in color. To quench the reaction, the reaction mixture was transferred onto ice. NaOH was slowly added into the mixture, which resulted in acetic acid byproduct from the acetic anhydride reactant/solvent. This resulted in a clumpy and dark mixture.
Aims of experiment • Determine the rate constants for hydrolysis of (CH3)3CCl in solvent mixtures of different composition (50/50 V/V isopropanol/water and 40/60 V/V isopropanol/water) • Examine the effect of solvent mixture composition on the rate of hydrolysis of (CH3)3CCl Introduction With t-butyl chloride, (CH3)3CCl, being a tertiary halogenoalkane, it is predicted that (CH3)3CCl reacts with water in a nucleophilic substitution reaction (SN1 mechanism), where Step 1 is the rate-determining step. The reaction proceeds in a manner as shown
Chem 51LB Report Ngoc Tran - Student ID # 72048507 The purpose of this lab is to examine the composition of three components of gas products of elimination reaction under acidic condition by conducting the dehydration of primary and secondary alcohol, and under basic condition by conducting the base-induced dehydrobromination of 1-bromobutane and 2-bromobutane. Then gas chromatography is used to analyze the composition of the product mixtures. Gas chromatography (mobile phase) is used to analyze the composition of three components of the gas products. A syringe needle with gas product is injected into the machine, and the component is eluted and the composition is related to the column or the peaks.
Conclusion In this lab, the reactivities of different types of hydrogens, including primary, secondary, tertiary aromatic, aliphatic, and benzylic hydrogens, were analyzed. The experiment was conducted twice, simultaneously. One set of test tubes containing bromine, dichloromethane, and one of toluene, ethylbenzene, tert-butylbenzene, cyclohexane, methylcyclohexane, or more dichloromethane (control), were exposed to UV light; the other equal set of test tubes were placed in a fume hood with the light off. This set of test tubes was not fully in the dark.
Dehydration of 2-Methylcyclohexanol Sura Abedali Wednesday 2:00 PM January 31, 2018 Introduction: Dehydration reactions are important processes to convert alcohols into alkenes. It is a type of elimination reaction that removes an “-OH” group from one carbon molecule and a hydrogen from a neighboring carbon, thus releasing them as a water molecule (H2O) and forming a pi bond between the two carbons1. In this experiment, 2-methylcyclohexanol undergoes dehydration to form three possible products: methylenecylcohexane, 1-methylcyclohexene, and 3-methylcyclohexene in a Hickman still apparatus. Adding 85% Phosphoric Acid to protonates the “-OH” group, turning it into a better leaving group and initiating the dehydration reaction.
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.
The purpose of this experiment was to learn about metal hydride reduction reactions. Therefore, the sodium borohydride reduction of the ketone, 9-fluorenone was performed to yield the secondary alcohol, 9-fluorenol. Reduction of an organic molecule usually corresponds to decreasing its oxygen content or increasing its hydrogen content. In order to achieve such a chemical change, sodium borohydride (NaBH4) is used as a reducing agent. There are other metal hydrides used in the reduction of carbonyl groups such as lithium aluminum hydride (LiAlH4).
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!
This means there are two possible pathways for the t-butoxide can take, which can result in either cis or trans-butene products. In the 2-bromobutane reaction, t-butoxide will actually attack the beta hydrogen on the least substituted carbon group (methyl), resulting in the alkene, 1-butene (no cis- or trans-). Despite E2 mechanisms generally favoring Zaitsev products, when t-butoxide is involved, the Zaitsev’s rule is broken and the Hoffman product is favored because the bulkiness of t-butoxide forces it to attack the least substituted beta hydrogen. Following the discussed theories, it was
The isolation and purity of crude acetylferrocene were tested through column chromatography. Crude acetylferrocene was observed to be an orange powder with a mass of 2.28 g. The percent yield was 124% ((2.28g/1.84g) x100%). The high percent yield was due to the high amount of sodium bicarbonate added in the previous lab. .100 g was weighed out on an evaporation dish.