a)
Interpretation:
Whether the electrocyclic reaction shown takes place in conrotatory or disrotatory manner is to be stated. The conditions, thermal or photochemical, under which the reaction can be carried out also is to be stated.
Concept introduction:
In elecrocyclic reactions involving even number of electron pairs, a thermal reaction occurs in conrotatory manner and a photochemical reaction occurs in disrotatory manner.
In elecrocyclic reactions involving odd number of electron pairs, a thermal reaction occurs in disrotatory manner and a photochemical reaction occurs in conrotatory manner.
b)
Interpretation:
Whether the electrocyclic reaction shown takes place in conrotatory or disrotatory manner is to be stated. The conditions, thermal or photochemical, under which the reaction can be carried out also is to be stated.
Concept introduction:
In elecrocyclic reactions involving even number of electron pairs, a thermal reaction occurs in conrotatory manner and a photochemical reaction occurs in disrotatory manner.
In elecrocyclic reactions involving odd number of electron pairs, a thermal reaction occurs in disrotatory manner and a photochemical reaction occurs in conrotatory manner.
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Chapter 30 Solutions
Organic Chemistry
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- Propose reaction mechanisms for the synthesis of methyl ethyl ketone from (a) methanol and ethane, (b) methane and ethanol, and (c) methane, ethane, and water. For each elementary step, what would be a good reaction coordinate and why? What differences in the overall reaction rate would you expect? Plz do Allarrow_forwardWhat is the full mechanism for the oxidation of cyclododecanol through NaOCI; EtOAc/H2O, Bu4NBr, HCI-cat ? Please include all arrows and formal charges.arrow_forwardThe rate law for addition of Br2 to an alkene is first orderin Br2 and first order in the alkene. Does this informationsuggest that the mechanism of addition of Br2 to analkene proceeds in the same manner as for addition of HBr?Explain.arrow_forward
- Provide the whole reaction mechanism (generation of electrophile, nucleophile, bond formation, bond breaking and movement of arrows) and the final product of the following reactions:arrow_forward(a) In the lab, you are required to synthesize the target molecule 1 from the starting material provided in the following scheme. Upon completion of the reaction however, the compound you obtained was product 2, by reacting the starting material with water in the presence of H2SO4: OH OH Product 2 Starting Material Target Molecule 1 Based on your observations and knowledge of chemistry, answer the following questions: (i) Outline a detailed reaction mechanism to clearly explain the formation of product 2. (ii) Justify why product 2 was formed. 2.arrow_forwardIllustrate the resonance effect of the methoxy group -OCH3, on the structure of the benzene ring. Draw all the oissuvke resonance forms of methoxybenzene, including the hybrid Based on the structures, explain how the presence of the -OCH3 group affects: (i) the reactivity of the benzene ring towards electrophilic attack (ii) the orientation or point of attack of an incoming electrophilic reagent on the benzene ring.arrow_forward
- Examine each of the following ALLOWED electrocyclic, sigmatropic or cycloaddition reactions. Determine in each of these how many electrons are involved. For electrocyclic and cycloaddition reaction, this includes π-electrons (4n or 4n+2); for sigmatropic reactions, one σ bond electrons also contribures. Tell what type of concerted reaction each is, and whether 4n or 4n+2 system. Thank you!arrow_forwardPredict the major product for the following electrocyclic reaction under two different conditions. For each reaction, shade the appropriate lobes of the entire orbita/ array and indicate the substituents at appropriate locations. For each reaction, indicate whether it is conrotatory, disrotaotry and show appropriate stereochemistry. (a) Under photochemical (b) Under Thermal بتشتر hv heatarrow_forwardIdentify the following pericyclic reaction; explain the course, product distribution and stereochemistry of the reaction. Where the first product is produced 70% and the second product is produced 30%.arrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage LearningOrganic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning