Title: Bromination of (E) – Stilbene (Microscale Procedure) Author’s Name: Reinaldo George Professor: Elvis Barrett Date of Experiment: Thursday July 16th 2015 Institution: Nova Southeastern University Abstract The purpose of this experiment was to synthesize the second intermediate in the b series of Sequential Reactions by carrying out the bromination of (E)-stilbene to obtain meso-stilbene dibromide. This product is the precursor to diphenylacetylene, the next synthetic intermediate in the b series. A further purpose of this experiment is to demonstrate the stereospecific addition of bromine to alkenes. The percentage recovery was also calculated and recorded. On completion of this experiment; my lab partners and I were able to successfully synthesize the second intermediate in the b series of the
2 marks 4 Draw the structural formula of Compound G. 1 mark 5 Using the chemical shift correlation for 13C NMR, predict the number of peaks for Compound G and draw in the position of the peaks on the blank spectrum below, annotating each peak with its corresponding structure. (2 marks) 6 Draw the structural formula for 2-chloro but-2-ene. Below this draw a structural formula of an isomer of 2-chloro but-2-ene and name this substance.
| The SN2 reaction-Preparation of n-butyl bromide | | | | | Name: Aasefa Shaikh Date: Mon Sept. 26, 2011 Subject: Chem 3000- Organic Professor: Arturo Orellana TA: George Achonduh Name: Aasefa Shaikh Date: Mon Sept. 26, 2011 Subject: Chem 3000- Organic Professor: Arturo Orellana TA: George Achonduh Abstract The formation of n-butyl bromide from 1-butanol and sodium bromide was observed under SN2 conditions. It was observed that the bromine anion, a strong nucleophile, was able to attack the protonated alcohol and displace water, which serves as a better leaving group than the hydroxide ion. The primary structure of 1- butanol allowed the bromide anion to a backside attack which led to a transition state, the rate determining step, followed by an inversion of the product, n-butyl bromide. The mass of the product obtained was 6.92 grams, giving only 33.7% percent yield. Introduction Nucelophilic substitutions are chemical reactions in which an electron rich nucleophile attacks the electron poor electrophile1.
Abstract: The aim was to react trans, trans-2,4-Hexadiene-1-ol with maleic anhydride. The reaction was a Diels-Alder reaction and it produced cis-1,3,3a,4,5,7a-Hexahydro-5-methyl-3-oxo-4-isobenzofuran-carboxylic acid. This reaction gave a percentage yield of 72%. The reaction product was purified and the melting point of both the crude and purified product was found. The purification step reduced the percentage yield to 47%.
A functional group is an identity of a certain family compound. It decides compound's chemical properties and how the compounds in the family will react. In this experiment, we study about alkenes, a functional group that consists of one double bond. Specifically, we will learn about hydration of (+) - α - pinene, an alkene by hydroboration-oxidation reaction. Also, we will discover its regiochemistry and stereochemistry.
The electrons of the polarizable pi bond in the alkene E-stilbene acts as a nucleophile, a chemical species that donates an electron pair, and attacks one of the bromines in the dibromide molecule, which then causes the sigma bond to break as well. This results in an intermediate, which can either be an acyclic planar carbocation or
p-Aminobenzoic Acid Blake Thilmony*, Dillon Hofsommer Department of Chemistry, North Dakota State University, P.O. Box 6050, Fargo, North Dakota 58102 *Blake.M.Thilmony@my.ndsu.edu Received March 28, 2011 ____________________________________________________________ ____________ P-aminobenzoic acid was synthesized with a three-step reaction involving the addition and removal of a protecting group, to result in a higher yield when oxidation occurs. The synthesis was followed by the isolation and analysis of the product using methods of vacuum filtration and NMR spectroscopy. The experiment had some errors during synthesis involving transferring and formation of byproducts and impurities, and resulted in a modest 48.9% yield. ____________________________________________________________ ____________ Introduction1 The purpose of this experiment was to prepare the vitamin p-aminobenzoic acid, or PABA.
The citric acid cycle takes certain compounds that donate protons and electrons to the electron transport chain. The electron transport chain then generates ATP through the process of oxidative phosphorylation. Krebs cycle also produces two ATP through the process of substrate phosphorylation. This process occurs in the mitochondria. • What is the role of the electron transport system?
It is produced by reacting nitric acid and sulphuric acid simultaneously. The lone pair from oxygen breaks the OH bond when it comes in contact with sulphuric acid. Furthermore, NO2OH2 break and dissociate to form H2O water along with the electrophiles NO2. The electrons from the benzene ring attack NO2 causing the double bond to break. Multiple resonance is created from the movement of electrons.