I. INTRODUCTION Synthesis Acetylsalicylic acid is an acetyl derivative of salicylic acid which appears as a white and crystalline and a weakly acidic substance with a melting point of 135°C and is also known to be aspirin. It is one of the most widely used drugs that can lower fever and is used as a painkiller. According to (Escobel‚ 2011)‚ Aspirin is synthesized through the reaction of salicylic acid with acetyl anhydride that causes a chemical reaction that turns salicylic acid’s hydroxyl group
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Exercise No. 8 CARBOXYLIC ACIDS AND ACID DERIVATIVES I. OBJECTIVES: • To investigate the physical and chemical properties of Carboxylic acid and its derivatives • To understand the reactions of carboxylic compounds and derivatives. II. EXPERIMENTAL RESULTS Solubility of Carboxylic acids in 10% NaHCO¬3 Acetic acid - formation of bubbles Benzoic acid - formation of bubbles Test for Acetic acid NaOH + Acetic acid - blue litmus paper turned red NaOH + Acetic acid + FeCl3 - red colored
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VASAMID U~ A C R Co.‚ PBARLIVER‚X. Y . ] &Butyl Esters of Amino Acids and Peptides and their Use in Peptide Synthesis1 BY GEORGEv. ANDERSON i A ND FRANCIS. C.4LLAHAN M R ECEIVED NOVEMBER 1959 30‚ T he s ynthesis of t-but)-1 esters of amino acids and peptides and their use in peptide synthesis is described. T h e most convenient method was the acid-catalyzed reaction of isobutylene with benzyloxycarbonylamino acids or peptides followed by catalytic hydrogenation to produce the basic
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by everyday pollution from houses‚ factories‚ cars‚ and etc. This is the concept of acid rain‚ which according to EPA.gov is a broad term referring to a mixture of wet and dry deposition from the atmosphere containing higher than normal amounts of nitric and sulfuric acids. Acid rain isn’t just rain‚ its forms like hail or snow‚ which is wet deposition‚ and smoke or dust‚ which is dry deposition. The effects of acid rain are quite terrifying bringing all types of problems to the Earth‚ for example
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slightly higher than the H-O-H bond angle in water because of the stronger electron repulsion between the bulky alkyl groups. Preparation of Ethers: 1. Preparation of symmetrical ethers from alcohols H2SO4 R O R + H2O 2ROH 2. Williamson Ether Synthesis R O Na - - + + + R’X R O R’ + NaX Ar O Na + RX Ar O R + NaX Involves a nucleophilic substitution reaction. Halide ion is displaced by the alkoxide or phenoxide ion. Gives best results when 1o alkyl halides are
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Acid Base Titration bre’ana March 1‚ 2013 Purpose: The purpose of this experiment is to determine the concentration of a solution of NaOH by titration with a standard solution of HCl. It was also the purpose to determine the concentration of a sample of white vinegar by titration with a standard solution of NaOH. Introduction: Using the method of titration is how the experiment gets to the conclusion of the concentration of a solution. When doing this experiment‚ measurement is very important
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NUCLEIC ACIDS I.BASIC CONCEPTS II.CLASSES III.CHEMICAL NATURE IV.FUNCTION I.BASIC CONCEPTS NUCLEIC ACIDS polymeric macromolecules‚ or large biological molecules‚ essential for all known forms of life are made from monomers known as nucleotides Each nucleotide has three components: a 5-carbon sugar‚ a phosphate group‚ and a nitrogenous base If the sugar is deoxyribose‚ the polymer is DNA. If the sugar is ribose‚ the polymer is RNA. Together with proteins‚ nucleic acids are the most
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Worksheet — Summary of identified misstatements Entity Period ended 335 Page 1 of 2 Objective: To document misstatements identified during the audit and to evaluate: - The effect of identified misstatements on the audit. - The effect of uncorrected misstatements‚ if any‚ on the financial statements. Performance materiality Insignificant misstatements under $ need not be recorded below. Amount of over (under) misstatement in the financial statements Circumstances of occurrence
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of this experiment are to determine if the products derived from amide synthesis and Williamson Ether Synthesis are identical‚ and if one of the synthetic routes is more advantageous than the other. In Part 1‚ an attempt to synthesize acteophenetidin crystals by amide synthesis was made. We began by removing the colored impurities from the p-Phenetidine (reddish-brown) by placing 2g of the sample in 38 mL of hydrochloric acid and heating the solution to boiling point. Upon reaching just below boiling
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. Yes‚ comparably to TLC plate 2 and 3. The benzophenone is more neutral but as the same time its nonpolar‚ being that Silica gel in TLC 2 was polar and the solvent ethyl acetate-hexane is non-polar it moved relatively with the solvent. The stationary phase in TLC 3‚ alumina is non polar and the solvent ethyl acetate is polar so from the ideal that polar does not attract non-polar benzophenone stick stronger to alumina non-polar rather than moving up with polar solvent ethyl acetate as it did in
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