Interpretation: The bicyclic ring systems among the given systems that can be prepared by an intermolecular Robinson annulation are to be stated.
Concept Introduction: The combination of the Michael reaction and intramolecular aldol reaction in which the formation of a ring takes place is known as Robinson annulation reaction. In this reaction, the carbonyl compound is treated with a base which leads to the elimination of a proton from the
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Organic Chemistry
- Which of the presented structures (A-F) is the expected product of the following Friedel-Craft alkylation reaction?arrow_forwardaddition of hbr to a double bond with an ether (-or) substituent occurs regiospecifically to give a product in which the Br OR are bonded to the same carbon. Draw the two possible carbocation intermediates in this electrophilic addition reaction,and explain using resonance why the observed product is formed.arrow_forwardIdentify the following pericyclic reaction; explain the course and stereochemistry of the reaction.arrow_forward
- give the major product of the following reactions with the appropriate stereochemistry and regiochemistryarrow_forwardOnly one of these statements about nucleophilic aromatic substitution is true. O as the number of ortho and para electron withdrawing groups increases, the reaction rate decreases O the reaction proceeds by an addition-elimination mechanism the reaction involves a carbocation intermediate with delocalization of electrons all are falsearrow_forwardWhat compound undergoes metathesis to form each of the following compounds?arrow_forward
- How can you distinguish in a SNAr reactionwhether it will occur according to an additionelimination or an elimination-addition mechanism?arrow_forwardWhich of the following is the structure of the rearranged carbocation intermediate in the following dehydration?arrow_forwardWith sulfides are treated with α,β-unsaturated ketones and aldehydes, they can attackeither through direct or conjugate addition. Based on the NMR spectrum obtained fromthe product of the reaction below, indicate whether the reaction occurs by direct orconjugate addition and provide an arrow pushing mechanismarrow_forward
- What product(s) are formed in the following reaction. Indicate the proper stereochemistry of the product(s).arrow_forwardwhat is the structure of the substitution product in the following reaction and consider stereochemistry in deciding your product?arrow_forwardWhich of the following statements is incorrect? Chlorobenzene undergoes EAS reactions faster that methoxybenzene Meta substitution means 1,3-arranged product is formed on benzene An aromatic compounded loses its aromaticity in the first step of EAS Benzene rings require strong electrophiles in order to undergo EAS reactionsarrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning