Preparation of dephenylacetylenefrom dibromostilbene

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Reference no: EM13707252

Question- Part A; Bromination oftrans-stilbene(materials used in part A: trans-stilbene, 10%bromine-dichloromethane solution, dichloromethane,cyclohexene)

Part B; Preparation of dephenylacetylenefrom dibromostilbene(materials used in part B: ethanol, ethyleneglycol, potassium hydroxide, dibromostilbene)

Questions

1) show the mechanisms of each part (Aand B) of thesynthesis.

2) during reflux in part B, the reaction smokes. whatsubstance is responsible for this smoke?

3) Why is the cyclohexene is used in the first step? why doesit not contaminate the product?

4) When this synthetic sequence is performed starting with2-butene rather than stilbene, another product other than 2-butyneis the major product. what is this product and why does it form preferentially to 2-butyne?

Please explain why you chose your answer!

Reference no: EM13707252

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