Question

Post- Laboratory Questions: 1. Draw the product of the following Diels-Alder reactions 2. What starting materials would be used to prepare the following compound by the Diels- Alder reaction? 3. Cyclopentadiene dimerizes easily. Before using cyclopentadiene in a reaction, it is necessary to crack the diene. Draw the Diels-Alder reaction for the dimerization of cyclopentadiene. 4. What are the products of the following Diels-Alder reactions? Show the stereochemistry where applicable

Answer 1

Answer -1) The reaction A & B both follow [4+2] cycloaddition of diels alder reaction.

The product of reaction A : in this the double bond to which 2 methyl groups are attached no need to show stereochemistry because these are planar at sp2 hybridized carbon atoms of double bond.

And CN can be above the plane and below the plane in stereochemistry both products are correct.

Because CN substituent can be close to diene or it can be away from the diene & no other substituents are also not present in starting material according to which we have to mention the stereochemistry.

Answer -2) The starting materials are shown in the image & this reaction also follow [4+2] cycloaddition of diels alder reaction.

ON CN A + CN (4+२] 04 । A + [42] २ ) A + (4+२.]