Part I (20 marks) – Multiple Choice (2 marks each). Use the structure below to answer questions 1-7. 1. How many degrees of unsaturation are found in the above compound? a) 2 2. c) 4 d) 5 e) 6 What term best describes the alkene in the above compound? a) R 3. b) 3 b) S c) Z d) E e) trans What is the configuration of the chirality centres (stereocentres) labelled 1 and 2 in the above compound? a) 1 is R and 2 is S b) 1 is R and 2 is R c) 1 is S and
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found that the product yielded 1‚2-epoxydihydronaphthalene as well as naphthalene. Introduction In 1990‚ professor E.N. Jacobsen reported that chiral manganese complexes had the ability to catalyze the asymmetric epoxidation of unfunctionalized alkenes‚ providing enantiomeric excesses that regularly reaching 90% and sometimes exceeding 98% . The chiral manganese complex Jacobsen utilized was [(R‚R)-N‚N’-Bis(3‚5-di-tert-butylsalicylidene)-1‚2- cyclohexanediaminato-(2-)]-manganese (III) chloride
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Chemistry Unit 1 – Revision Questions Chemistry 1A 1) Define an element. How many are there in the Periodic Table? 2) Write a table with the charges and masses of protons‚ neutrons and electrons. 3) Define atomic number and mass number. 4) Draw electron (energy level) diagrams for Be‚ S‚ Al‚ Cl and K. Also‚ write down the number of protons and neutrons for each. Finally‚ write the symbols (with mass no. and atomic no.) 5) Why have all Group 7 elements (halogens) got similar chemical properties
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Formation of an Alkene by Alcohol Dehydration Lab Report Balanced Chemical Equation for the Main Reaction Mechanism The acid-catalyzed dehydration of secondary and tertiary alcohols involves non-isolable carbocation intermediaries. In the first step of the of the reaction mechanism below‚ a phosphoric acid catalyst adds a proton to the oxygen atom of the alcohol to form an oxonium ion. The OH is converted to a better leaving group as the positive charge on the oxygen weakens the carbon-oxygen
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or SN2). OH O H H Br H + :Br : SN2 :Br : O H H Br + H2O OH O H Br O + H2O + :Br : SN1 :Br : Br 7. Give the structure of the principal organic product formed by photochemical bromination of methylcyclopropane‚ draw the mechanism of the reaction. Br2‚ h h Br Br H . .Br Br Br Br 2Br . . + HBr Br + .Br
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Use this packet and your book to answer the questions throughout this packet. Organic Nomenclature - Alkanes‚ Alkenes‚ Alkynes Naming organic compounds can be a challenge to any chemist at any level. Historically‚ chemists developed names for new compounds without any systematic guidelines. In this century‚ the need for standardization was recognized. For simple molecules‚ the nomenclature system worked out by the International Union of Pure and Applied Chemists (IUPAC) works well. For complex
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Name Naza Moore ID# 24120389 Lab# 2 Lab instructors Alecia Palmer and Donald Burke Course Instructor Maureen Wilson Lab Title Preparation of cyclohexene from cyclohexanol Aim Preparation of an Alkene by dehydration of an alcohol in the presence of a catalyst. Calculate the percentage recovery of products. Test for purity and identification of products. Abstract Cyclohexene and cyclohexanol are both colourless aromatic compounds. The major difference between the two is the presence
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Task 3: The chemical tests used in order to carry out and collect these results are useful for the simple identification of colourless organic liquids and ones that are often found at the scenes of crime. The first test carried out was the Lucas test which was used to identify a variety of alcohols following the contribution of a given solution‚ from carrying this out I could then identify that primary and secondary alcohols were present with one tertiary alcohol also being present however despite
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IntroductionA dehydration reaction of an alcohol results in an alkene. This type of reaction requires an alcohol‚ an acid catalyst and heat. Generally strong concentrated acids‚ like sulfuric acid and phosphoric acid‚ are used as the acid catalyst.The acid catalyst protonates the alcohol‚ to make a much better leaving group. Weakest bases make the best leaving groups‚ so once the alcohol is protonated the leaving group leaves and produces in a carbocation and water. In order to form the double bond
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ASynthesis of an alkyl halide Jade A. Chuahiong and Marika Bianca F. Morioka Institute of Chemistry‚ University of the Philippines‚ Diliman‚ Quezon City 1101 Philippines Date Performed: April 25‚ 2013; Date Submitted: April 30‚ 2013 Alkyl halides could be synthesized through several processes and using different compounds as reactants. One of the simplest method used is the addition of a hydrogen halide to an alcohol. In this research‚ tert-butyl alcohol was reacted with cold concentrated
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