Subject: Experiment 23: Stereochemistry of the 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
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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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Chris Holet 7 – 20-12 Steriochemistry of Bromine Addition to trans-Cinnamic Acid Purpose: To carry out the addition of bromine to trans-cinnamic acid and to identify the product from its melting point. Molecular Structures and Chemical Reaction(s): Results and Calculations: Table of reagents Name Density (g/ml) Amount used Amount # moles Bromine (excess) Trans-cinnamic Acid 1.246 g/cm3 0.148g – do conversion Dichloromethane 1‚3266 g/cm3 -
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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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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 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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Bromination of Trans-Cinnamic Acid Christopher B. Martin CHEM 3411 1 Mechanism of Bromine Addition to Alkenes Understanding the chemical mechanism (order of bonds broken and made as well as intermediates formed) has a great value in chemical synthesis. The chemical mechanism of a reaction will influence the rate of the reaction‚ the stereochemistry of the product(s)‚ and the extent of possible undesired side reactions. Organic reaction mechanisms investigate the path towards a desired product
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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 bond. Both of the
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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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