Abstract The bromination of trans-cinnamic acid was completed to determine dibromide’s stereochemical structure and its mechanism. After the addition of bromine to trans-cinnamic acid‚ the product was identified by its melting point and infrared spectrum resulting in erythro-2‚3-Dibromo-3-phenylpropanoic acid after comparing similar properties. Introduction In this lab‚ the bromination of trans-cinnamic acid was completed to determine dibromide’s stereochemical structure‚ and from there determine
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The Stereochemistry of Bromine Addition: Bromination of trans-Cinnamic Acid Pitak Chuawong Objectives 1. To perform bromination of trans-‐cinnamic acid 2. To investigate stereochemistry of bromination reaction Introduction Alkenes undergo electrophilic addition to give alkyl halides. When bromine is used as a
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The reaction of 0.139 grams of trans-cinnamic acid‚ 0.8 mL of glacial acetic acid‚ and 1.0 mL of 1.0 M of Bromine in acetic acid was recrystallized to form a solid‚ clear‚ crystal- like product. The melting was taken from the recrystallized product to determine what had been obtained. The melting point was found to be 130.5°C-133.7°C. Concluding that the product formed from the addition of bromine was a mixture of the erythro-2‚ 3-dibromo-3-phenylpropanoic acid‚ which has a known melting point
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STEREOCHEMISTRY: ADDITION OF BROMINE TO trans-CINNAMIC ACID Required Prelab Readings: McMurry Chapter 5‚ Sections 8.2 & 21.2 Morhig‚ Sections 7.1 and 7.3. Previous techniques that you must know and be able to perform: Suction Filtration and Melting Point This experiment is designed to demonstrate two concepts. First‚ it will provide a demonstration of how chemists can use chemical reactions to understand reaction mechanisms. Second‚ is the concept of multi-step synthesis. You will
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Addition of Bromine to trans-Cinnamic Acid Introduction/Abstract: The purpose of this experiment was to carry out the bromination of trans-cinnamic acid‚ to determine the stereochemistry of the dibromide product of 2‚3-dibromo-3-phenylpropanoic acid‚ and find out whether the reaction proceeds by the usual bromonium ion mechanism or some other mechanism. In this experiment trans-cinnamic acid was mixed with glacial acetic acid and stirred in which then bromine/acetic acid solution was added to
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aciAwareness on trans fats among selected food service operators K.M.Amila Sidheeka‚ S.Thilagamani Department of Food Service Management and Dietetics‚ Avinashilingam Institute For Home Science and Higher Education for Women – University‚ Coimbatore – 641043‚ Tamil Nadu ABSTRACT Food options‚ choices and eating behaviours are influenced by a complex number of factors including the nationality‚ culture‚ community‚ family and the individual’s food likes and dislikes and are affected by global
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What are trans fatty acids‚ and where do they come from? We’re used to hearing about saturated and unsaturated fatty acids. Saturated fatty acids - which come from animal fats (meat‚ lard‚ dairy products) as well as tropical oils such as coconut and palm oils - raise the levels of LDL cholesterol. Unsaturated fats - which come from vegetable oils - in general‚ do not increase cholesterol levels‚ and may reduce them. Because saturated fatty acids were found to be bad for you a couple decades ago
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The purpose of the experiment was to perform an electrophilic addition reaction by the bromination of cinnamic acid. The product of this reaction is 3-Phenyl-2‚3-dibromo propionic acid‚ which is purified by recrystallization. Cinnamic acid (3-phenylprop-2-enoic acid) is an unsaturated carboxylic acid. The electron rich π cloud (see Figure 1) in the double bond of this structure is nucleophilic and can be considered a Lewis base. It can therefore be saturated by the addition of a halogen to the double
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Preparation and purification of acetylsalicylic acid Results and Data treatment (A) Preparation of aspirin i) Details about the reactants Reaction of the acetylation of salicylic acid is following From the balanced reaction above‚ it can be seen that the stoichiometry between salicylic acid and acetic anhydride is 1: 1. In this experiment‚ 21.7mmol of salicylic acid was used to react 6.0mL of acetic anhydride and salicylic acid was limiting reagent. The expected amount of salicylic
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Preparation and properties of boric acid Result The mass of borax‚ g | 10.0734 | The mass of watch glass‚ g | 36.2842 | The mass of watch glass with product‚ g | 39.9803 | The mass of product‚ borix acid‚ g | 3.6961 | Test | Result | Boric acid is dissolved in water and methyl red indicator is added. | Pink solution is observed | Mannitol is dissolved in water and methyl red indicator is added. | Pink solution is observed | Both solution is added together | The colour of solution
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