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
The hypothesis was supported by the employed methods. Introduction: This experiment was performed to show how bromination of alkenes reacts, and to be able to successfully synthesize meso-stilbene dibromide. The reaction of bromine with alkenes is an addition reaction where the nucleophilic double bond attacks the electrophilic bromine
Many sources of error were responsible for recovering a small amount of product. Introduction: The carbon-carbon bond formation is an important tool in organic chemistry to construct the simple as well as an organic compound. There are several
6.7, 6.8 Synthesis, Decomposition, and Displacement Reactions Kelly Mok SNC2DE-A Mr. Cox Partner: Nidhi S. Lab performed: September 18 & 19, 2014 Due: September 26, 2014 Purpose The purpose of this experiment is to observe and compare synthesis, decomposition, single displacement and double displacement reactions and the physical and chemical reactions that occur as a result. Hypothesis
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.
Chem 51 LB Experiment 3 Report Scaffold: Bromination of Trans-Cinnamic Acid 1. The goal of this experiment was to perform a halogenation reaction through the addition of two bromides from pyridinium tribromide. This was accomplished by reacting trans-cinnamic acid with pyridinium tribromide. After the reaction took place, melting point analysis was conducted to find out the stereochemistry of the product, which could either be syn-addition, anti-addition, or syn + anti-addition. 2.
Introduction The bromination of cyclohexene is a classical organic chemistry experiment designed to elucidate the addition of bromine to alkenes. This reaction entails the addition of an electrophilic electron promoter across a carbon-carbon double bond, and the formation of vicinal dibromide. Scheme 1 indicates the net reaction. During the process of the experiment, different analytic methods were implemented to distinguish the reaction product, such as gas chromatography (GC), thin layer chromatography (TLC), and infrared (IR) spectroscopy. Scheme 1: Net Reaction Scheme for the Bromination of Cyclohexene Results and Discussion Component Molecular Weight Mass (g) Volume (mL) Density Boiling Point (°C)
This is the result because The iodide displaces the chlorine forming 1-iodobutane. Since iodine is a much better leaving group than chlorine, 1-iodobutane will allow the cyanide ion to displace the leaving group much easier. The sodium ions will then ionically bond with the iodide ions to reform sodium iodide. This process lowers the total activation energy for the reaction. What would be the major product if 1,4-dibromo-4-methylpentane was allowed to react with one equivalent of NaI in Acetone?
Experiment 2 Report Scaffold (Substitution Reactions, Purification, and Identification) Purpose/Introduction 1. A Sn2 reaction was conducted; this involved benzyl bromide, sodium hydroxide, an unknown compound and ethanol through reflux technique, mel-temp recordings, recrystallization, and analysis of TLC plates. 2. There was one unknown compound in the reaction that was later discovered after a series of techniques described above.
It is understood the mechanism is acid-catalyzed where protons coordinate with the carbonyl oxygen to make the carbonyl carbon more electropositive for nucleophilic attack (Scheme 1). In the experimental procedure all reactants were added together, this is inefficient as the protons can coordinate with either trans-cinnamic acid or methanol. Coordination with methanol is unnecessary as it reduces its nucleophilicity and makes less protons available to coordinate with the carboxylic acid. To improve
Additionally, we observed a low yield of 52.45% (Table 2). the obtained data indicates we were unsuccessful at completing the bromination E-stilbene Introduction Alkenes are compounds with a C=C bond, double bonds contain both and bonds. In electrophilic addition reactions, a bond is broken and 2 bonds are formed. We aim to complete this reaction using stilbene and bromine. Stilbene is an olefinic compound that can be used in manufacturing dyes.
Act Two Scene V & Vl Major characters: Cyrano and Roxane Minor character(s): The Duenna Scene V Cyrano, Roxane, and the Duenna Cyrano: I’ll give her my letter with the slightest opportunity! (ROXANE, masked, appears behind the glass of the door, followed by the DUENNA. Cyrano goes to open the door.) Come in!
Objective The objective of this experiment is to produce a sample of hexaphenylbenzene from the Diels-Alder addition of tetraphenylcyclopentadienone and diphenylacetylene, both of which were synthesized from previous lab procedures. Procedure Part A- Preparation of Hexaphenylbenzene • In a 25 mL round-bottom flask, 0.50 g (0.0013 mol) of tetraphenylcyclopentadienone and 0.50 g (0.0028 mol) of diphenylacetylene were poured, and with a heating mantle and a ring stand, the flask was vigorously heated.
My project stemmed from an older project that involved the catalytic oxidation of alkenes with oxygen to form aldehydes. My project was to test for catalytic activity by mixing various metals (in a salt compound) with different ligands to determine if the mixture, when mixed with an alkene, could induce oxidative cleavage of the alkene. The results did not indicate that the reactions were catalytic but that further testing could be done. Although the results of the experiment were not successful it is important to learn that as scientists our experiments will not always yield the desired results, In addition to this I learned about how some of the other projects that took place with Dr. Stanley’s lab took years to complete and that the results often differed than the expected outcome.
1- a. One aldehyde gives a positive iodoform test. Which one is it? • Ethanal b. Explain why ethanal gives a positive iodoform test. • Ethanal is the only aldehyde to give a the positive result because the reaction requires a methyl group connected to a carbon atom with a keto or an OH- substituent.
