2) Draw the structure of the major/most stable product that results when the diene shown is treated with HBr at 60°C. (Hint: first, use scratch paper to show all possible intermediates and the corresponding products; then analyze the relative stability of those isomeric intermediates and products before drawing your conclusion)

[References] Compound A reacts with 1 molar equivalent(s) of hydrogen on catalytic hydrogenation. A undergoes reaction with ozone, followed by Zn treatment, to give: Compound A CH3CCH3 Propose a structure for A. • You do not have to consider stereochemistry. You do not have to explicitly draw H atoms. In cases where there is more than one answer, just draw one. P. C opy aste C - ChemDoodle Previous Cengage Learning Cengage Technical Support

bobyrisbla • PRACTICE PROBLEM 8.23 Alkenes are more reactive than alkynes toward addition of electrophilic reagents (i.e., Br2, Cl2, or HCI). Yet when alkynes are treated with one molar equivalent of these same electrophilic reagents, it is easy to stop the addition at the "alkene stage." This be a paradox and yet it is not. Explain. appears to

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Draw the major expected product or products of the reaction shown below. If stereochemistry at any site is important, be sure to show it clearly at that site for your product(s). Do it on a piece of paper, scan or take a picture of it and then submit the file. (1) Hg(OAc), / H20 (2) NaBH,

3. Using the carbon sources provided and any other necessary reagents needed, propose a viable synthesis for the product shown. Your synthesis must include a Diels-Alder reaction. For each step in your synthesis be sure to show the reagents/conditions necessary for that step and also draw the major product expected for each step leading to the product. You will also need to use reactions discussed in previous chapters as well. Carbon Sources Available H₂C=CH2 CH3Br steps wirt or oy holted and Doubiquiti o toubong pimaryborman

which of the following general statements is true about the addition of HBr to conjugated dienes  (A) At low temperature, the 1,2-adduct predominates (B) At low temperature, the 1,4-adduct predominates (C) At high temperature, the 1,2-adduct predominates (D) Temperature does not affect the outcome of the reaction

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The ether shown can be prepared using a Williamson ether synthesis; that is, by reacting an alkoxide ion with an alkyl halide. Draw the alkoxide ion and alkyl bromide that you would combine to make the ether with the highest possible yield. You may omit the metal cation counterion that accompanies the alkoxide ion for the purposes of this question. Include all lone pairs and nonzero formal charges.