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- Indicate the reagents (diene and phyllodiene) necessary to obtain the following compound by a Dirls-Alder reaction. CH3 CH3 COOH COOHThe 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.Bicyclo-2,5-heptadiene can be prepared in two steps from cyclopentadiene and vinyl chloride. Provide a mechanism for each step.
- Draw and discuss the mechanism (with arrows to show electron movements) of the Diels-Alder reaction between anthracene and maleic anhydride. Draw the orientation and phases of the reacting p-orbitals showing how they overlap in a “suprafacial” geometry to form productWrite a general rule that can be used to predict the major product of a Diels–Alder reaction between an alkene with an electron-withdrawing substituent and a diene with a substituent that can donate electrons by resonance depending on the location of the substituent on the diene.The Wittig reaction can be used for the synthesis of conjugated dienes, as, for example, 1-phenyl-1,3-pentadiene. -CH=CHCH CHCH, 1-Phenyl-1,3-pentadiene Propose two sets of reagents that might be combined in a Wittig reaction to give this conjugated diene.
- C(CH3)2OH C(CH3):X +H20 where (X=F, CI, Br, I) give reaction with each of halogen as well determine with which halogen substitution reaction is more favorable and feasible and give reason of its feasibility?One step in the synthesis of dodecahedrane involves reaction of the tetraene C with dimethylacetylene dicarboxylate (D) to afford two compounds having molecular formula C16H16O4. This reaction has been called a domino Diels–Alder reaction. Identify the two products formed.) 1) Provide the structure of the major product, which results from Diels-Alder reaction. Draw the structure of the MOST stable product that results when the diene shown is treated with HBr at 80°C. HBr 80 °C CH3 Diels-Alder Reaction Provide the structure of the major organic product in the following reaction. XO
- Predict the product(s) of the following Diels-Alder reaction. Include stereochemistry if appropriate.Give the structure of the main product of each of the following Diels-Alder reactions. Make sureto show the stereochemistry of the products when unambiguous.What represents the structure of the diene to carry out the following Diels-Alder reaction?