Which of the following describes the sigmatropic rearrangement that occurs in the reaction shown below? CH2 CH3 dede CH3 CH₂ [3,3] sigmatropic rearrangement [2,3] sigmatropic rearrangement [1,4] sigmatropic rearrangement [1,3] sigmatropic rearrangement [1,5] sigmatropic rearrangement
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![Which of the following describes the sigmatropic rearrangement that occurs in the
reaction shown below?
CH2
CH3
dede
CH3
CH₂
[3,3] sigmatropic rearrangement
[2,3] sigmatropic rearrangement
[1,4] sigmatropic rearrangement
[1,3] sigmatropic rearrangement
[1,5] sigmatropic rearrangement](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd5f94329-0c75-4d54-8cbe-897c3964bfcb%2F2649988a-51a5-400a-bfe3-4c4c33ce7048%2Fnrslx93_processed.jpeg&w=3840&q=75)
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- Which of the following would accomplish the transformation below? a) 1. HSCH2CH2SH, H+; 2. H2, Raney Ni b) H2N-NH2, NaOH(aq), heat c) H2, Pd d) All of the aboveArrange the following compounds in the increasing order of reactivity towards Conc.HNO3 & Conc.H₂SO4 1. Benzene 2. Chlorobenzene 3. phenol 4. Toluene 5. Nitrobenzene A 1.2.3.4.5 (B) 5.1,243 5.1.4.2.3 D 5.2.1.4.3Predict the major products of the following reactions, including stereochemistry.(a) cyclohexene + KMnO4>H2O (cold, dilute)(b) cyclohexene + peroxyacetic acid in water(c) cis@pent@2@ene + OsO4>H2O2(d) cis@pent@2@ene + peroxyacetic acid in water(e) trans@pent@2@ene + OsO4>H2O2(f) trans@pent@2@ene + peroxyacetic acid in water
- Using one or more of the following compounds as starting materials or products illustrate, with an example, each of the following type of pericyclic reactions. Your answer should include curved arrow mechanisms. (i) a disrotatory thermal electrocyclic reaction (ii) a conrotatory photochemical electrocyclic reaction (iii) a [4+2] cycloaddition (iv) a [3,3]-sigmatropic rearrangementWhen Br2 is added to buta-1,3-diene at -15 °C, the product mixture contains 60% ofproduct A and 40% of product B. When the same reaction takes place at 60 °C, theproduct ratio is 10% A and 90% B.Show why A predominates at -15 °C and B predominates at 60 °C.Predict the major products of the following reactions. Include stereochemistry whereapplicable.(a) 1@methylcycloheptene + BH3 # THF, then H2O2, OH
- When the following stereoisomer of 2-bromo-1,3-dimethylcyclohexane is treated withsodium methoxide, no E2 reaction is observed. Explain why this compound cannotundergo the E2 reaction in the chair conformation.Predict the stereochemistry of the following Pericyclic reactions a) a thermal [2 + 6] cycloaddition b) photochemical [3 ,6] sigmatropic rearrangementElimination occurs when (Z)-3-bromohex-3-ene is treated with NaNH2. Under the same conditions, 1-bromocyclohexeneundergoes elimination much more sluggishly. Explain why
- Classify each pericyclic reaction as an electrocyclic reaction,cycloaddition, or sigmatropic rearrangement. Indicate whether thestereochemistry is conrotatory, disrotatory, suprafacial, or antarafacial.Predict the major products of the following reactions, including stereochemistry.(a) cyclohexene + KMnO4>H2O (cold, dilute)(b) cyclohexene + peroxyacetic acid in water(c) cis@pent@2@ene + OsO4>H2O2(d) cis@pent@2@ene + peroxyacetic acid in waterChoose the correct option. 1. Which of the following reactions best describes the Diels-Alder reaction?A)electrocyclic reactionB)cycloaddition reactionC)sigmatropic reactionD)radical reactionE)nucleophilic substitution reaction 2.Which of the following statements best describes the theory of Conservation of Orbital Symmetry?A)Molecular orbital of the transition state must be similar to that of the reactant.B)Molecular orbital of the transition state must be similar to that of the product.C)Only s orbitals from reactants and products are utilized.D)Molecular orbitals of reactant and product must have similar symmetry.E)Molecular orbitals of reactant and product must have different symmetry. 3.Through what type of single pericyclic reaction did the reaction proceed? 5-methylcyclopenta-1,3-diene to 1-methylcyclopenta-1,3-dieneA)[1,2] sigmatropic hydrogen migrationB)[1,3] sigmatropic hydrogen migrationC)[1,4] sigmatropic hydrogen migrationD)[1,5] sigmatropic hydrogen migrationE)none of the…