chem206 Rapor-11 - ABSTRACT: In this experiment the aim was...

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Unformatted text preview: ABSTRACT: In this experiment the aim was to investigate unimolecular elimination reactions. In the first part of the experiment cyclohexanol was run into sulfuric acid catalyzed unimolecular elimination reaction and cyclohexene is expected to be produced. In the second half of the experiment whether E1 reaction worked successfully or not was checked with a color test which includes the reaction of KMnO 4 and Br 2. The conclusion is that cyclohexene could not be produced from cyclohexanol due to non-existence of any color changes in the tube after addition of KMnO 4 or Br 2. INTRODUCTION: The aim of this experiment was to study elimination reactions. In elimination reactions of organic substances alkene formation expected from alkanes. The name elimination refers to the lost of a small molecule. The most common elimination reactions include the dehydration of alcohols or dehydrohalogenation of alkyl halides. [9]. Elimination reactions can be divided into two subcategory due to their timing and mechanisms: E1 and E2. E1 reactions are also called unimolecular elimination reactions. Mainly two steps are involved in E1 reactions: ionization and deprotonation. [1] Figure 1: Sample Meachanism for E1 reactions [11] E2 reactions are also called bimolecular elimination reactions. This model was first introduced by chemist Sir Christopher Ingold in 1920. [1]. Figure 2: Sample Mechanism for E2 reactions 1 [11] Factors that affect the elimination reactions are the structure of the substrate, nature of leaving group, solvent in which the reaction occurs and the stability of the carbocation that has been formed. Also solvent is required to dissolve both leaving group and the carbocation. Highly polar solvents are needed. [11] Table1: Structure and Reactivity Relation of Elimination Reactions[8] Structure E1 E2 Primary 1  Does not occur Occurs when strong bases are used...
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This note was uploaded on 04/17/2009 for the course CHEM chem206 taught by Professor F.y during the Spring '09 term at Kalamazoo Valley Community College.

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chem206 Rapor-11 - ABSTRACT: In this experiment the aim was...

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