The Diels–Alder Reaction – A [4+2] Cycloaddition Used: - Maleic Anhydride  - Furan  Summarize the Rf values for the starting material and product. Explain any differences or similarities in the Rf values based on molecular structure. Are the Rf values useful in analyzing the reaction?

-A on 2. Which class of pericyclic reactions is the Diels-Alder reaction? What is a (4+ 2) n cycloaddition reaction? Explain •a cycloaddikon where ore reactant moleculee cortriautes 41 ele ctrons & the other a electrans 3. 4. (a) Give the systematic name of the diene in this reaction 15-cis)1,4-diphenyl-1,3-betadiene (b) Calculate the difference in the standard Yree energy, AG° (kJ/mol) between the two major conformations of this diene? (Write the formula and show your work.) = (-617.920458au- AGO Product- reactants k017.9259320 = 0.00S 47444K/ml.005474qu 14.37 KJ/ mol 1au= alas.KLcis) (trans) 5. Give the systematic name of the dienophile in this reaction. Maleie nhydride 6. Give the systematic name of the adduct in this reaction. 7. What is the melting point of your synthesized Diels-Alder adduct 8. Calculate the standard free energy of activation AG # for this reaction (Write the formula and show your work). AG = G75- G°R = (-994.1304ay au)-(-997.194182 au) - 0.039898au= .639898ay•…

Draw one enantiomer of the major product of the following Diels- Alder reaction. (Use wedge/dash bonds to indicate the orientation of substituents in the product. Hydrogen atoms on chirality centers must be shown explicitly.) H.

12. Show the mechanism and the product of the following Diels-Alder reaction. (2) heat Х atic