In this experiment‚ the stereochemistry of 2‚3-dibromo-3-phenylpropanoic was found to determine syn or anti addition of bromines. The melting point was 199-203°C and the NMR J values angle is at 167 which both prove the erythro-2‚3-dibromo-3-phenylpropanoic. Determination of the Stereochemistry of 2‚3-dibromo-3-phenylpropanoic acid. Introduction The purpose of this experiment was to determine the mechanism of the reaction of trans-cinnamic acid with the addition of bromines to 2‚3-dibromo-3-phenylpropanoic
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UNIVERSITY OF ZIMBABWE Programme Bscd (ІІ) Course CH202 Practical Number 4 Title d-block elements- Manganese AIMS /OBJECTIVES * To understand the reactions of manganese * To prepare Mn(acac)3 and calculate percentage yield * To calculate the percentage of Mn and acetyl acetone
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reaction using a phosphorus-containing Hornes-Emmons-Wittig reagent to generate an enolate anion of trimethyl phosphonoacetate instead of a phosphorus ylide. The methyl trans-4-methoxy cinnamate produced is then analyzed using melting point and 1H NMR spectroscopy. Theory The Wittig reaction prepares alkenes from carbonyl compounds by attacking a phosphorus ylide with a nucleophilic carbon atom stabilized by a triphenylphosphonium group. An ylide is a compound that contains two oppositely charged
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Three-Dimensional Structure of Proteins Rotation around the -Carbon in a Polypeptide A Sterically Nonallowed Conformation The Helix and Pleated Sheet Conformationally allowable structures where backbone is optimally Hbonded (linear Hbonds). Helix (3.613 Helix): •3.6 residues/turn •Rise = 0.15 nm/ residue •13-atom hydrogenbonded loop Linus Pauling and Robert Corey‚ 1950 Pleated Sheet: •Anti-parallel or parallel •2.0 residues/”turn” •0.34 nm/residue (anti-parallel) or 0.32 nm/residue
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possible to match an unknown compound with a known compound because similar compounds will display similar characteristics. In this experiment‚ identification of the unknown ketone is accomplished through thin layer chromatography‚ melting point‚ and 1H-NMR spectroscopy. The unknown ketone is from a homologous series of methyl ketones. CH3CO (CH2) nCH3 The first step in the lab is the preparation of the solvent used in the developing chamber for thin layer chromatography. The solvent used is a 3:1 mixture
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Substitution Reactions of 3-phenyl-1-phenol‚ 2-pentanol‚ and 2‚4-dimethyl-3-pentanol Samantha Sparks‚ Isi Nosegbe and Sabrina Becker. Department of Chemistry‚ IUPUI‚ 402 N. Blackford St.‚ Indianapolis‚ IN 46202 This project was collaborated on by three different organic chemistry students‚ who individually synthesized and researched each of the three substitution reactions in this experiment.. The first reaction was an Sn2 reaction of 3-phenyl-1-propanol with NaBr and H2SO4 to create1-bromo-3-phenylpropane
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CHAPTER 1 (CLOVE) INTRODUCTION (CARDAMOM) 1.INTRODUCTION Strong consumer demand for safe and high-quality foods can be attributed in part to the widespread availability and accessibility of quality health data and information. There are also new concerns about food safety due to increasing occurrence of new food-borne disease caused by pathogenic microorganisms. This raises considerable challenges‚ particularly since there is increasing unease regarding the use of chemical
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that was beginning to kill many people all over the world. She had always had a special bond with her grandson and always supported his research. Inspired by her‚ Raymond began to test cancerous liver samples in rats using nuclear magnetic resonance (NMR) equipment. This equipment wasn’t new by any means and was already being used in bio-chemistry and geology to study rocks and minerals. It worked by putting a nuclei in a magnetic field which then emitted and reabsorbed electromagnetic radiation. This
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The spectrum is quite complex due to the conformation of the protons on the cyclohexene ring. (H (400 MHz; CDCl3) 5.40 (1 H‚ t)‚ 4.70 (2 H‚ s)‚ 2.08 (1 H‚ m)‚ 2.05 (1 H‚ m)‚ 1.97 (2 H‚ m)‚ 1.89 (1 H‚ m)‚ 1.79 (1 H‚ m)‚ 1.73 (3 H‚ s)‚ 1.65 (3 H s)‚ 1.47 (1 H‚ m).8 IR – Infrared spectrum of neat product can be collected
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the literature melting point of 146°C. Potential source of errors could be in the filtration process which could decrease the actual yield. In addition‚ there could be moisture present in the solid leading to errors in the weight. Based on the NMR spectral data‚ the frequency of the signals was 15.6Hz‚ which is very close to the theoretical frequency of 12-18Hz. This confirms that the compound is
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