Bromine

Brett Reynolds Luiz Isidoro, Brian Covello April 11, 2012 Bromination of an Alkene Abstract This laboratory test was designed so that the resoluteness effect in stereo limitedity in a decarboxylative excrement could be determined. The experiment was divided in devil parts, where the first involved the bromination of trans-cinnamic venereal disease into (RS,SR)-2,3-dibromo-3-phenylpropanoic acid, the ware demand for use as the substrate in the decarboxylation elimination reaction. The last mentioned was our second stage, where the brominated yield was reacted in a given solvent (water, in this case), giving a specific stereoisomer. This stereospecificity was determined by spectroscopy test results. It was found that water, when apply as a solvent in such elimination reaction, gives a trans output Background This was a two week experiment. During week one, the bromination occurs in the, trans-cinnamic acid; our alkene. The electrons from the C=C double trammel net at the important home to the carboxyl group attack the atomic number 35. This bromine attaches to the of import nose candy creating a carbo-cation intermediate in the important position. This carbo-cation intermediate allows for resonance stability throughout the molecule. at once the autocratic charge is at the important carbon, it is then attacked by the disallow bromine atom.

In week two, elimination of the bromine occurs and carbon dioxide is released. In the first step, water is used as a base to extract the bromine in the beta position of the carboxyl group creating a double bond to the alpha carbon. Water is then introd uced and extracts a proton from the hydroxyl! group, forming another(prenominal) C=O double bond. This then forms a replete(p) go away group from the bond between the carbonylic group and the alpha carbon. Carbon dioxide is given off, and the final product is quenched utilise the hydronium ion. The final product is produced, (E)-2-bromoethenyl-benzene. Experimental program Week one started with trust 3.00 grams of trans-cinnamic acid...If you want to get a full essay, order it on our website: BestEssayCheap.com

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