Cycloadditions: The Diels-Alder Reactions

Purpose: To produce cis-endo-Bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic anhydride from cyclopentadiene and Malic Anhydride, using cycloaddition as the mechanism. To find the clear using the melting occlusive Procedure: Reference: audition 10.Cycloadditions: The Diels-Alder Reaction. Hart, H., Crane, L. E., Hart, D. J., and Vinod, T. K., research lab Manual for Organic Chemistry: A Short Course, twelfth ed., Brooks/Cole, Cengage Learning: Belmont, 2007,pages 133-142. Modifications: -Maleic anhydride weighed in an Erlenmeyer flask -Warm on a hotplate -Wash carrefour with a weensy ice low temperature ether -Dry product on outsize filter paper Observations: gameboard 1: measured set Compound/Item Measured value Maleic Anhydride 4.4917g intersection 4.8398g harvest melting point123.5-141.

6 oC Table 2: discover reactions ReactionObservation warm up Maleic anhydride + ethyl acetate-Maleic anhydride ( fresh powder) dissolved into a light(a) colourless limpidness Adding Ligroin and cooling-Turns to a clear liquid with a white precipitate Adding Cyclopentadiene-Cloudy white liquid during mixing -settled to a fuck layer of white precipitate and a top clear colourless liquid Product albumen powder During melting pointWhite powder behind run to clear colourless liquid closedown: In this experiment cis-endo-Bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic anhydride was made, and there was a final jackpot of 4.8398g. Also, the product was light white fluffy crystals. The melting point was 123.5-141.6 oC and melted into a clear colourless liquid. The cyclopentadiene needed for this subprogram had to be freshly prepared be cause even at dwell temperature it readily! undergoes a Diels-Alder reaction with itself to form dicyclopentadiene. The Ligroin was used as a solvent. In the reaction of Maleic anhydride complex with cyclopentadiene, the endo isomer was made alternatively of the exo isomer because the overlaps of the p orbitals. The highest occupied molecular...If you want to get a replete(p) essay, order it on our website: OrderEssay.net

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