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- Identify A, B, and C, intermediates in the synthesis of the five-membered ring called an α- methylene-γ-butyrolactone. This heterocyclic ring system is present in some antitumor agents.Predict the major products of the following reactions. If it is possible, write all stereoisomers.Acid-catalyzed hydrolysis of the following epoxide gives a trans diol. CH3 CH3 CH3 НО, НО, H,SO, + H,O HO HO Only this glycol This glycol is is formed. not formed. Of the two possible trans diols, only one is formed. How do you account for this stereoselectivity?
- 5. Provide a mechanism for the following transformation: H2SO4 OHComplete the statements by providing the reagents necessary to complete each step of the synthesis. Ketone reacted with CO₂H and then yielded a derivative, which was treated with 1) (i) C6H5MgBr (ii) H3O+ 2) (i) DIBAL-H (ii). H3O+ 3) Sia2BH,H202, NaOH 4) CH2N2 (diazamethane) CO₂C2H5 5) PCC (an oxidant) 6) H2SO4, H2O, heat 7) HgSO4/ H2SO4 8) C₂H5OH, H3O*, heat TABLE OF REAGENTS to form an unsaturated carboxylic acid, treatment with to yield unsaturated aldehyde as the final product. CHO MacBook Air 9) C6H5 CH2 P(C6H5)3; NaOH 10) PCC (an oxidant) 11) NaCN, H₂SO4 12) PhCH2CHO, H3O*Use the Witting reaction to answer the following question.
- The following questions concern ethyl (2-oxocyclohexane)carboxylate.(a) Write a chemical equation showing how you could prepare ethyl (2-oxocyclohexane)-carboxylate by a Dieckmann cyclization.(b) Write a chemical equation showing how you could prepare ethyl (2-oxocyclohexane)-carboxylate by acylation of a ketone.(c) Write structural formulas for the two most stable enol forms of ethyl (2-oxocyclohexane)carboxylate.(d) Write the three most stable resonance contributors to the most stable enolate derived from ethyl (2-oxocyclohexane)carboxylate.(e) Show how you could use ethyl (2-oxocyclohexane)carboxylate to prepare 2-methylcyclohexanone.(f) Give the structure of the product formed on treatment of ethyl (2-oxocyclohexane)-carboxylate with acrolein (H2C=CHCH=O) in ethanol in the presence of sodium ethoxide5) Provide the products necessary to complete the synthesis below. Indicate what mechanism was used for each product. OH PB13 Но heatWhat products do you expect from the reaction of the following ethers with HI? (a) (b) CH3 CH3 CH3CH2CH-0-CH2CH2CH3 ?
- 5. Solvolysis of bromomethylcyclopentane in methanol gives a complex product mixture of the following five compounds. Propose mechanisms to account for these products. CH₂ CH3 CH₂Br CH3OH heat H3COCH3 + 0⁰⁰ OCH3single reaction sequence: a certain ketone undergoes alkylation to give new ketone, when reacted with a base and then an alkylating agent, 1-bromopropane. What is the structure of the final ketone product?When 2-methylpent-2-eno reacts with HCl two alkyl halides are formed. Present the structures of the formed products and propose a mechanism that explains the formation of these products. Indicate the main product.