endstream endobj startxref PDF Synthesis of Cyclohexene The Dehydration of Cyclohexanol - UMass xref Cross), Forecasting, Time Series, and Regression (Richard T. O'Connell; Anne B. Koehler), Chemistry: The Central Science (Theodore E. Brown; H. Eugene H LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward), Campbell Biology (Jane B. Reece; Lisa A. Urry; Michael L. Cain; Steven A. Wasserman; Peter V. Minorsky), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Psychology (David G. Myers; C. Nathan DeWall), Principles of Environmental Science (William P. Cunningham; Mary Ann Cunningham), Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), Civilization and its Discontents (Sigmund Freud), Give Me Liberty! Figure 5.1 Preparation of cyclohexene 1,0 H.SO, sulfuric acid cyclohexanol cyclohexene cyclohexene. symmetrical alcohol methylcyclohexene is located at around 650-850 wavenumbers and consists of Cross), The Methodology of the Social Sciences (Max Weber), Principles of Environmental Science (William P. Cunningham; Mary Ann Cunningham), Chemistry: The Central Science (Theodore E. Brown; H. Eugene H LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward), Give Me Liberty! %PDF-1.7 The pure product was then weighed. 341 0 obj <>/Filter/FlateDecode/ID[<3AC64CA9DCB4EF4D8E776CEFF096BA32>]/Index[321 30]/Info 320 0 R/Length 102/Prev 323258/Root 322 0 R/Size 351/Type/XRef/W[1 3 1]>>stream A double or triple bond is usually found in one of the reactants. The mass of the extracted dry cyclohexene, = (Mass of conical flask with extracted dry cyclohexene - mass of dry empty conical flask), No. x\9}dCm8vvUO7_'qC )n{TJ*"{)zSYyc5][e911Gy?-Mm>kanL_Yn Sophomore year laboratory report for the preparation of cyclohexene from cyclohexanol. 0000003647 00000 n the placement of your thermometer. To increase the purity of the cyclohexene, the temperature of the reaction should not be too high in order to prevent from more water being distillated. The major product obtained from E1 dehydration of 2-methylcyclohexanol is 1-methylenecyclohex-ene. LcpR #Ob@UQ\!Y_k$y Why is saturated sodium chloride, rather than pure water, used From this data, the theoretical amount of cyclohexene is calculated. the more substituted alkene Write down observations for alcohol test demo In this experiment, cyclohexene was formed by an elimination reaction. Theoretical mass of cyclohexene (g) = moles of cyclohexene (mol) x molecular weight (g/mol) = 0.057 mol x 82.15 g/mol = 4.7 g, = (mass of recovered compound,g /mass of compound in original mixture)*100. Chromatography displays how polluted it is with different liquids. Instructor Test Bank. hbbd```b``3@$?XLE"Y]`:0 I 0V 1. The only unaffected color was cyclohexene with bromine in dichloromethane. The cyclohexene is an unsaturated hydrocarbon, the -electrons attacks a bromine atom in a bromine molecule to carry out a heterolytic cleavage that yields the cyclic bromonium ion. Cyclohexane from Cyclohexanol lab report.docx - Davis 1 In the test between cyclohexene and bromine in chloroform, the brown solution is decolorized. The carbocation then would form an alkene or return to, what it originally was, in this case it would return to being cylcohexanol. methylcyclohexene. cyclohexene, it distills up the column and received into the receiver, Psychology (David G. Myers; C. 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Title: The preparation of cyclohexene from cyclohexanol. 0000007640 00000 n 5. From that, 6.0 mL cyclohexanol weighing 5.7 grams, it is expected to give 4.7 grams of cyclohexene, but in this experiment 2.299 grams of cyclohexene is produced and the percentage recovery calculated was 48%. the more substituted alkene of 85% phosphoric acid was added into flask gently. endobj Discussion: Depending on which liquid was used, the colors were changed. Phosphoric (V) acid is highly corrosive. After that a stir bar was dropped in the flask too. Before we heat the mixture of cyclohexanol and phosphoric (V) acid in the pear shaped flask, why do we have to add a few chips of pumice stone into the flask? The cyclohexene can also, turn back into cyclohexanol fast enough before it boils off. 161) into a 50 mL round bottom flask (small neck) and cautiously add 85% phosphoric In this experiment, 1 of saturated sodium chloride is used to rinse the Hickman head process. Course Hero is not sponsored or endorsed by any college or university. Keep cyclohexene in the fume hood when using it. It is reverse of addition reaction. The yield obtained from the original 22.25 g of cyclohexanol was 10.12 g of, cyclohexene, giving a percentage of 45.58%. During the distillation process the temperature did rise, to be over a little 100 C and that means water was present with the cyclohexene. This apparatus provides a source of heat for the c. 2-methylcyclohexanol : 1-methyl-1-cylohexene is the major product because it is
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