(a)
Interpretation: The product formed by the thermal electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.
Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.
(b)
Interpretation: The product formed by the thermal electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.
Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.
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- Synthesize each compound from cyclohexanone and organic halides having ≤ 4 C's. You may use any other inorganic reagents.arrow_forwardDraw the product(s) formed when each alkene is treated with either [1] HBr alone; or [2] HBr in the presence of peroxides.arrow_forwardDraw the products of each reaction carried out under high-dilution conditions. Indicate the stereochemistry at all stereogenic centers.arrow_forward
- Draw the structure (including stereochemistry) of an alkyl chloride that forms each alkene as the exclusive E2 elimination product.arrow_forwardDraw the products obtained (including stereochemistry) when each compound is treated with LDA, followed by CH3I.arrow_forwardGive the IUPAC name for each compound. (include R,S designation or E, z configuration if needed)arrow_forward
- Identify the following ethers or epoxides as symmetrical or asymmetrical. а. b. С. a.arrow_forwardDraw the monochlorination products formed when each compound is heated with Cl2. Include the stereochemistry at any stereogenic center.arrow_forward10.64 Devise a synthesis of each compound from cyclohexene as the starting material. More than one step is needed. a. CO b. C. CN OH "SH + enantiomerarrow_forward
- Draw all stereoisomers formed in each reaction.arrow_forwardUsing ethynylcyclohexane as a starting material and any other needed reagents, how can the following compounds be synthesized?arrow_forwardDraw the products formed (including stereoisomers) when each compound is reduced with NaBH4 in CH3OH.arrow_forward
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