'Diels-Alder reaction Essay\r'

'Purpose:\r\nIn this taste a Diels-Alder reply was used to ashes the harvest-tides. Cyclopentadiene and maleic anhydride were reacted to rushher to form cis-Norbornene-5,6- block upo-dicarboxylic anhydride. 7-oxabicyclo{2.2.1}hept-5-ene-2,3-dicarboxylic anhydride was also uprised done a Diels-Alder reaction with the combination of fur furan and maleic anhydride.\r\nEquation:\r\nProcedure:\r\n damp 1\r\nIn a flaskfulful equipt with a septum side arm and go past with distillation heat and a thermometer chalk up 2.5ml of mineral oil. Heat the oil. At the end of the distillation heat place an deoxyephedrine filled beaker. When the oil reaches 250°C shoot down 0.6ml of dicyclpentadiene drop wise through septum. receive sure the temperature does non go above 45°C. The produce is then weighed.\r\nPart 2\r\nIn a reaction pipe place 0.20g maleic anhydride and 1.0ml of ethyl acetate rayon then kick in 1.0ml of hexane. Then add 0.20ml of cyclopentadiene. Cool the organ p ipe in an starter bath. Remove solvent from crystals using pipette. wash drawing crystals with hexanes then remove solvent again. realize crystals to dry.\r\nPart 3\r\nIn a flask place 2.4g maleic anhydride and add 20ml of diethyl ether. break down mixture using hot central office then let cool to board temperature. Add 1.8ml of furane to the flask. Wrap the flask with Parafilm after placing a stopper on top of flask. Place the flask on a lower floor the hood for the next lab period. Upon the income tax return of the next class period the organize crystals were scrapped from the flask. The crystals were then weighed and liquescent arrests were observe.\r\nDiscussion and destination:\r\nA Diels-Alder reaction was used to produce the products of this experiment. The first reaction was cyclopentadiene with maleic anhydride to from the product of cis-Norbornene-5,6-endo-dicarboxylic anhydride. to begin with that could be produced, dicyclopentadiene had to be cracked to ge t cyclopentadiene for the starting material. Cyclopentadiene and maleic anhydride were mixed together and cooled to get on temperature, which produced crystals. The solvent was pipette out of the tube to separate the crystals. The crystals were then scraped on the strive paper to get weight and run points. The end product rewarded 82.6%. The melt point was observed at 162-163°C. This indicated a cultivation to pure substance with the actual melting point being 165°C. The succor part of the experiment was the reaction of furan with maleic anhydride.\r\nThis reaction produced 7-oxabicyclo{2.2.1}hept-5-ene-2,3-dicarboxylic anhydride. Maleic anhydride was combined with diethyl either to fade out the solid. Then furan was added and place low the hood for the next class period. During this condemnation crystals were formed in the stopped flask. The melting point for the end product was observed at 113-114°C. This indicated that the product was exo. The percent yield was calculated at 5.98%. There were many sources of error that could have contributed to the results of these experiments.\r\nThe end product could have cooled a little overnight to form more crystals. Also the crystals could have been dried more to produce better(p) melting points. Separating the solvent from the test tube was not completely precise and may have missed some of the product in the extraction. Scraping the crystals out of the flask or test tube was not easy and some of the product was lost during this step. Overall the experiment was a success.\r\n summon:\r\nWilliamson, K.; Minard, R.; Masters, K. Macroscale and Microscale Organic Experiments, 2011. Pg 617-629.\r\n'