The following compound undergoes an intramolecular Diels-Alder reaction to give a tricyclic product. Propose a structural formula for the product. heat An intramolecular Diels-Alder adduct
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- 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.The aryl diene undergoes sequential Heck reactions to give a product with the molecular formula C15H18. Propose a structural formula for this product.When anthracene is added to the reaction of chlorobenzene with concentrated NaOH at 350 °C, an interesting Diels–Alderadduct of formula C20H14 results. The proton NMR spectrum of the product shows a singlet of area 2 around d 3 and abroad singlet of area 12 around d 7. Propose a structure for the product, and explain why one of the aromatic rings ofanthracene reacted as a diene
- ) 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. XOThe following product is formed by an intramolecular Diels-Alder reaction. Provide the structure of the starting compound.Indicate the reagents (diene and phyllodiene) necessary to obtain the following compound by a Dirls-Alder reaction. CH3 CH3 COOH COOH
- In a strongly acidic solution, cyclohexa-1,4-diene tautomerizes to cyclohexa-1,3-diene.Propose a mechanism for this rearrangement, and explain why it is energetically favorableIndicate the reagents (diene and phyllodiene) necessary to obtain the following compound by a Dirls-Alder reaction. CH3 CH3The following reaction was performed as part of a research program sponsored by the National Institutes of Health to develop therapeutic agents for the treatment of cocaine addiction. Using what you have seen about the reactions of halogens with alkenes, propose a mechanism for this process.
- 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.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.a-Tetralone undergoes Birch reduction to give an excellent yield of a single product. Predict the structure of the product, and propose a mechanism for its formation.