Experiment2: Preparation of Dibenzalacetone Aim: Using the cabon-cabon bond making ability in carbonyl chemistry‚ Dibenzalacetone is synthesized from 2 equivalent of benzaldehyde and 1 equivalent of acetone in a base catalyzed reaction. Physical Data1: *detailed risk and safety phrases are attached. substance Hazards‚ risks and safety practices MW (g/mol) Amt. Used Mol. mp (K) bp (K) density(g/cm^3) acetone R11‚ R36‚ R67‚ S9‚ S25‚ S26 58.08 0.24 g 0.004 178.2 329.4 0.79 benzaldehyde R22
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85°C which is very close to the theoretical melting point of Fluorenone which is about 83 °C. Since the melting point was off by about 1.5°C it is assumed that some sources of error was obtained in the experiment. Since there was very little of the alkene in the sample‚ and none of it eluded out‚ it may have been stuck in the stationary phase. Hence when the ketone passed through the stationary phase it may have gotten contaminated leading to the error. Also all of the MTBE may not have evaporated
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chloride was synthesized through the use of separation (aqueous and organic layers) and distillation. Tert-butyl chloride is the alkyl halide which is being synthesized throughout the course of the experiment. Alkyl halides are derived from alkanes. Once an alkane has its original hydrogen atom replaced with a halogen‚ it is now considered an alkyl halide (UC 2016). This experiment utilizes chlorine as the halogen that takes the place of the hydrogen atom. Alkyl halides are versatile‚ and with little
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Dehydrating Cyclohexanol • Introduction The purpose of the lab experiment is to prepare cyclohexene from cyclohexanol through an acid-catalyzed dehydration. In order to produce the cyclohexene from cyclohexanol‚ an elimination reaction was performed. First by protonating the oxygen of the alcohol and creating an oxonium ion we replaced the poor leaving group (OH) into a better leaving group (OH2+). Second‚ dehydrating the cyclohexanol using phosphoric acid and sulfuric acid as acid catalysts
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Synthesis of trans-9-(2-Phenylethenyl)anthracene Introduction The purpose of this experiment was to convert carboxyl compounds into alkenes. While this reaction yields both the E and Z isomers‚ it is preferred over other reactions due to the lack of uncertainty of where the double bond is positioned. Also the stability of an ylide determines which isomer is the major product. 1 Experimental: Compounds Benzyltriphenylphosphonium chloride 9-Anthraldehyde 50% Aqueous NaOH DCM Product Formula weight
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Specimen Paper Centre Number Surname Other Names Examiner’s Initials Candidate Signature Question Mark Candidate Number For Examiner’s Use General Certificate of Secondary Education Foundation Tier 1 2 3 4 5 6 7 Science A Unit Chemistry C1 Chemistry 1F Chemistry Unit Chemistry C1 For this paper you must have: • a ruler • the Data Sheet (enclosed). You may use a calculator. F 8 9 TOTAL Time allowed ! 60 minutes Instructions ! ! ! ! Use black ink or black ball-point
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Sept 27‚ 2010 Chapter 4 * With four valence electrons‚ carbon can form four covalent bonds with a variety of atoms * This tetra valence makes large‚ complex molecules possible * Fundamental groups: Alkanes and Alkenes * The electron configuration of carbon gives it covalent compatibility with many different elements * The valences of carbon and its most frequent partners (hydrogen‚ oxygen‚ and nitrogen) are the “building code” that governs the architecture of living
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experimentally observed competing dihydroxylation reaction and the ligand-induced reaction rate acceleration. Introduction Sharpless et al. reported in the 1970s an aza-analogon of the osmium-catalyzed cis-vicinal dihydroxylation (DH)1 of alkenes‚ the aminohydroxylation (AH).2‚3 In 1996 it was rendered asymmetric4 and extended to a large variety of substrates in the following. The AH is synthetically important as it provides straightforward access to the aminoalcohol fragment present in
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in the presence of phosphoric acid. The alcohol was a mixture of cis and trans isomers‚ so it might have exhibited an Evelyn effect. It was also looked at if the products showed the Zaitsev’s rule‚ where in an elimination reaction‚ the most stable alkene was favored‚ which was usually the most substituted one and also the major product‚ which was the product with more % composition that was found out in the analysis. The % composition of the yield was found out by using the % composition of the products
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al Chain Reactions: Bromination of Arenes Introduction The purpose of the bromination of arenes was to determine the different reactivities of different hydrocarbons with different hydrogen atoms when reacted with bromine under free-radical substitution. The time it took for the bromine color to disappear was used to determine the order of reactivity of the different hydrocarbons. Data and Results The data of the 10 hydrocarbon tubes and the 2 control tubes with bromine and dichloromethane in
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