Electrophilic Aromatic Iodination of Vanillin Purpose: The purpose of this laboratory experiment is for an aromatic compound to undergo an electrophilic substitution reaction. To carry this out‚ our method combines sodium iodide and common bleach as the oxidizing agent in aqueous alcohol as the solvent. Balanced Chemical Equations: Physical Properties: Name of Chemical Chemical Structure Molar Mass (g/mol) BP/MP (ºC) Density (g/mL) Mass/Vol. Used Purpose 3-methoxy-4-hydroxybenzaldehye
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enthalpy of sublimation of Vanillin and o-Vanillin. AKnudsen cell with sample was weighed 10 times maybe just say weighed by difference‚ they don’t usually like it when you spell out the steps like that no way it was like 0.5 grams‚ check the lab again and at least 0.5 g of Vanillin or o-Vanillin was added to the cell and it was reweighed 10 times. This experiment depended heavily on the method of weigh by difference when determining the mass of sample (Vanillin or o-Vanillin) loss in sublimation. A
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The Iodination of Salicylamide Questions: 1. a) The possible sites of iodination of the salicylamide ring is on the ortho/para position to the -OH group. b) The most likely site of iodination is the para position. This spot has the least steric hindrance and is favorable due to the directing effects of the -OH and the withdrawing effects from the carbonyl. 2. The homo surface shows that salicylamide has large electron density at the para and ortho positions. These sites are more likely
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Estimation of the Activation Energy for the Iodination of Acetone Through the Effect of Temperature on the Rate Constant Joel Costa‚ Alex Fuentes‚ Michael Chea‚ Rex Nwerem Dr. Morgan Ferguson July 9‚ 2013 ABSTRACT | It is often important to determine the rate at which a chemical reaction takes place‚ i.e.‚ how fast it yields the desired products. Temperature is one of the factors that influence the rate of reactions and it does so by providing energy to reactant particles so that a larger
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Rates of Reaction: Iodination of Acetone Introduction: The rate at which a chemical reaction occurs depends on several factors: the nature of the reaction‚ the concentrations of the reactants‚ the temperature‚ and the presence of possible catalysts. In this experiment you will study the kinetics of the reaction between iodine and acetone in acid solution: For this reaction‚ you will determine the order of the reaction with respect to acetone and HCl and find a value for the rate constant‚ k.
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The Kinetics of the acid-catalyzed iodination of propanone Raw Data: Solution A:Propanone 2M Solution B: Iodine 0.005M Solution C: Sulfuric acid 1M Solution D: Distilled water Table 1 Experiment Volume of solution A ±0.05 (cm3) Volume of solution B ±0.05 (cm3) Volume of solution C ±0.05 (cm3) Volume of solution D ±0.05 (cm3) Total Volume ±0.2 (cm3) 1 2 2 2 4 10 2 4 2 2 2 10 3 6 2 2 0 10 4 2 1 2 5 10 5 2 0.5 2 5.5 10 6 2 2 4 2 10 7 2 2 6 0 10 Table 2 Experiment Time for yellow color to disappear
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Lab Report Iodination of Acetone Temperature as a Variable Objective The objective of this lab is to determine the energy of activation of the iodination of acetone. This will be done by performing the reaction at differing temperatures. The same reaction orders we obtained for the previous lab will be incorporated into this experiment. The equation Ea = -8.31 x slope of ln k vs. 1/T(K) will be used to determine the energy of activation required for this this reaction. Hypothesis
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Experiment 29 – Borohydride Reduction of Vanillin to Vanillyl Alcohol Goal To perform a sodium borohydride reduction of an aldehyde to produce an alcohol. Reading and Working Ahead Your discussion should include a mechanism for this reaction. Review: OP 12 – Vacuum filtration OP 28 – Melting point (using Mel-Temp®) Procedure Notes Calculate the necessary mass of vanillin and sodium borohydride for the procedure below. Also calculate theoretical yield of vanillyl alcohol. You
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SPE can be used to identify trace amounts of Vanillin. Stock solution of vanillin in water with concentration of 50 ppm was prepared. Four solutions with concentration of 5 ppm‚ 1 ppm‚ 0.5 ppm and 0.1 ppm were made from stock solution. UV-Vis spectra of standard solution was recorded at 229 nm and equal to 0.544 AU. Vanillin was separated on SPE cartridges using a 50% methanol and 50% water as eluting solvent. UV-Vis of blank‚ 1 ppm and 0.1 ppm vanillin sample was obtained at 0.078 AU and 0.014 AU
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Determination of Vanillin in Imitation Vanilla Essence Chloe Nolan 14832679 Introduction 4-hydroxy-3-methoxybenzaldehyde or as it is better known‚ vanillin is most commonly used to create imitation vanilla essence (Southam‚ 2013). Figure 1: vanillin structure Vanillin was first synthesised from eugenol from 1874 – 2001‚ from where it was later made from lignin- containing sulphite liquor which is a by-product of wood pulp processing in paper pulp manufacturing‚ most recently it is
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