Choose which class of pericyclic reactions the following reaction belongs to, and use the number of electron pairs involved in the reaction and the product's stereochemistry to ascertain whether the reaction proceeds thermally or photochemically. Check all that apply. ப H CH₂ CH3 CH3 CH3 CH3 cycloaddition sigmatropic rearrangement ene reaction electrocyclic reaction thermal conditions photochemical conditions CH₂

Choose which class of pericyclic reactions the following reaction belongs to, and use the number of electron pairs involved in the reaction and the product's stereochemistry to ascertain whether the reaction proceeds thermally or photochemically. Check all that apply. ப H CH₂ CH3 CH3 CH3 CH3 cycloaddition sigmatropic rearrangement ene reaction electrocyclic reaction thermal conditions photochemical conditions CH₂

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter21: Benzene And The Concept Of Aromaticity

Section: Chapter Questions

Problem 21.44P

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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!
Predict the products of halogenations, oxidations, reductions, and cleavages of alkenes, including the orientation (regiochemistry) and the stereochemistry of the reaction.
Predict the products of additions, oxidations, reductions, and cleavages of alkynes, including the orientation of the reaction (regiochemistry) and the stereochemistry.
(3) HI does not undergo free radical addition with 1-butene, even in the presence of a peroxide. Please provide an explanation by analyzing the propagation steps if the same radical reaction occurred with HI. Besides the bond dissociation enthalpies in the appendix, the following approximate bond dissociate enthalpies might be useful to you: ~310 kJ/mol The component of C=C CH3CH₂CH₂CH₂-Br CH3CH₂CH₂CH2-I -290 kJ/mol (C-Br bond) ~235 kJ/mol (C-I bond)
9. (a) With the help of orbital correlation diagram predict the conditions of 4+2r system. (b) Using PMO approach, discuss the reaction conditions for 4x electrocyclic reaction. (c) What are 1,3-dipolar cycloaddition reactions? Give examples. 10. Predict the product under the given reaction conditions and propose mechanism. C (b) A OMe O OMe OMe A in Decane
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C(CH3)2OH C(CH3):X +H20 where (X=F, CI, Br, I) give reaction with each of halogen as well determine with which halogen substitution reaction is more favorable and feasible and give reason of its feasibility?
Identify 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%.
Propose a mechanism for the following cycloaddition reaction. Classify the reaction using the [m + n] classifications for cycloadditions. Draw the bonding molecular orbitals and identify the type of bonding present (supra - supra, antaraantara, or supra - antara). Identify if this reaction would proceed thermally or photochemically.
11.; (a) Similar to alkanes, hydrogen gas can undergo radical bromination according to the reaction below. Propose a chain-reaction mechanism for this reaction, including an initiation step, propagation steps, and two plausible termination steps. The homolytic bond dissociation energy for Br-Br is 46 kcal·mole', for H-Br is 88 kcal'mole and for H-H is 104 kcal'mole'. hv H-H + Br-Br 2 H-Br (b) Calculate the overall AH for the above propagation steps (show all work).
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The reaction below is the addition of HCl to 3-methylenecyclohex-1-ene. CH2 + HCI (i) Draw and name the kinetic and thermodynamic products structures of this reaction. (ii) Show the mechanism of reaction, while explaining the kinetic and thermodynamic preference of the reaction.