VII. For each of the following Diels-Alder reactions, provide the structure of the missing reagent(s) or product. To receive full credit, be sure to include stereochemistry when appropriate. CH3 NC ° OCH3 CI H3C CO₂Me H3C CO₂Me H H3C H CH3 H

Predict the product of the following Diels-Alder reactions, using the correct stereo- and regiochemistry. Make sure you include a detailed explanation of your answer, and provide arrows for mechanisms of needed.

One of the following Diels-Alder reactions will occur more rapidly than the other. Draw the major, organic product for only the faster of these two reactions. You do not need to account for stereochemistry, but be sure your answer accounts for regiochemistry, where appropriate. CH3 H,C HN H,C ČH, N. H CH3 H2C ČH,

Following is an example of a type of reaction known as a Diels-Alder reaction 1,3-Pentadiene Ethylene 3-Methylcyclohexene (a racemic mixture) The Diels-Alder reaction between a diene and an alkene is quite remarkable in that it is one of the few ways that chemists have to form two new carbon-carbon bonds in a single reaction. Given what you know about the relative strengths of carbon-carbon sigma and pi bonds, would you predict the Diels-Alder reaction to be exothermic or endothermic? Explain your reasoning.

The following triene undergoes an intramolecular Diels-Alder reaction to give a bicyclic product. Propose a structural formula for the product. Account for the observation that the Diels-Alder reaction given in this problem takes place under milder conditions (at lower temperature) than the analogous Diels-Alder reaction shown in Problem 20.34.

Can you please explain why the correct answer to this question is option 2? I am having trouble understanding how and why. Please provide a detailed explanation and a drawing of how the diene and dienophile would create the product in the question.

The following Diels-Alder reaction product is an intermediate in the synthesis of cholesterol. Provide the structure of the major product. Show stereochemistry when applicable. Hint: there are two possible dienophiles, which one is the better dienophile? Provide a brief explanation of your choice. CH,O.

One of the following Diels-Alder reactions will occur more rapidly than the other. Draw the major, organic product for only the faster of these two reactions. You do not need to account for stereochemistry, but be sure your answer accounts for regiochemistry, where appropriate. CH 3 HN H₂C CH2 H₂C CH2 H₂C N H₂C CH3 H A

This is a Diels-Alder reaction between ethylene and cis-1,3-butadiene. For each cycloaddition product, draw in all hydrogen atoms, and write the molecular formula below.

1. Give the structure(s) of the product(s) for each of the reactions below, and be sure to indicate any relative stereochemistry (you can assume that each of the Diels-Alder reactions will proceed with endo selectivity). If no reaction is expected to occur under the indicated conditions, then write "no reaction" or NR, and explain why you would expect nothing than one product is formed, please indicate which one will be the major product or if they will be formed in equal amounts. In all cases, equimolar amounts of both components/reagents are present unless indicated otherwise. occur. If more Ś.30 d. A PhS. е. A f. 1. Br2, hv 2. KOt-Bu, t-BUOH 3. DBr, peroxides