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Chem 2545 post lab 6 - to determine the melting point Once...

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Chem 2545 Post Lab #6 Dominic Liss Title: Electrophilic Addition Reactions: Bromination of cis- and trans-stilbene Study of Reaction Mechanisms Objectives: To determine the mechanisms used with the bromination of cis- and trans- stilbene using melting points. Summary of Observations: Part A Weight of empty watch glass: 39.185 grams Weight of watch glass with substance: 39.545 grams Weight of substance recovered: 0.360 grams Melting point of substance: 86°C Part B Weight of empty watch glass: 44.558 grams Weight of watch glass with substance: 44.979 grams Weight of substance recovered: 0.421 grams Melting point of substance: 243.7°C Supplementary Questions: 1) a) I used cis-stilbene as my starting material b) The bromination reaction proceeded through the concerted mechanism. c) After we obtained the crystals from the experiment we used the buchi machine
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Unformatted text preview: to determine the melting point. Once we had the melting point we compared that value to values that were given in the lab manual. Using these values we were able to determine what the final product was and from that we were able to determine which mechanism it went through thus ruling out other mechanisms. 2) 3) The alternate reactions melting point was 243.7°C. This melting point was obtained by Sharyn Miller. She used the same idea and did the same thing as I stated in part C of question 1. After obtaining the melting point she narrowed down what she had using the given melting points. She then was able to rule out what mechanisms she did not have. Calculations:...
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