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Organic Chemistry - Assignment

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Added on  2021-04-16

Organic Chemistry - Assignment

   Added on 2021-04-16

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Running head: ORGANIC CHEMISTRYORGANIC CHEMISTRY[Author Name(s), First M. Last, Omit Titles and Degrees][Institutional Affiliation(s)]
Organic Chemistry - Assignment_1
2ORGANIC CHEMISTRYTitle: Witting Reaction-the Preparation of trans-StilibeneObjectivesThe objective of the experiment is to:prepare trans-StilibeneIntroductionThis experiment aims at preparing trans-Stilibene by the use of a witting reaction. In the witting reaction, the first step involves the combination of the carbonyl and ylide to form an intermediateknown as betaine. The next stage involves carbonyl approaching the ylide carbon at an angle of 90 with respect to the C-P bond[ CITATION VKA10 \l 1033 ]. An oxygen atom is able to form a newcovalent bond as soon as the betaine is formed. The oxygen atom forms a covalent bond with a phosphorous atom to form an oxaphosphetane ring. Upon the formation of the oxaphosphetane, the substitutes change to be cis. This is influenced bythe chosen path of the carbonyl as the betaine is formed. What this means is that the final alkene product that is favored will be formed and thus it will be the Z isomer[ CITATION Dan10 \l 1033 ]. The four main steps that are used in the synthesis of trans-stilbene using benzaldehyde are similar and use identical reagents despite the different conditions for the reactions. The equation below shows the reaction mechanism for the synthesis of trans-cinnamic acid through the Knoevenagel condensation of benzaldehyde with malonic acid.
Organic Chemistry - Assignment_2
3ORGANIC CHEMISTRYBelow is the reaction mechanism for the synthesis of 1-bromo—2-phenylethene through the E1 decarboxylative elimination of 2,3-dibromo-3-phenylpropionic acid[ CITATION Pau111 \l 1033 ].Materials4.6 g of benzyl chloride6.6 g triphenylphosphine10 ml petroleum ether10 ml sodium hydroxideAnhydrous magnesium sulphateMethodologyPlace 4.3 g of benzyl chloride and 6.6 g triphenylphosphine in a 100 ml conical flask
Organic Chemistry - Assignment_3

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