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- Choose 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…In 4+2 cycloaddition, ENDO stereochemistry is preferred because: endo stereochemistry allows the diene to adopt s-cis conformation. endo stereochemistry results in less steric hindrance. the transition state leading to endo stereochemistry is higher energy. it allows for additional π to π overlap between the diene and the dienophile.(2Z,4Z,6Z)-2-chloro-7-methoxyocta-2,4,6-triene (2Z,6Z)-2-chloro-7-methoxyocta-2,6-diene-4-yne Draw following molecules
- Draw all of the products, both constitutional isomers and stereoisomers, of the following reactions. a) 4,4-dibromo-1-ethylcyclopentene ---->Br2,H2O b) 3,3-dibromo-1-ethylcyclopentene ----> HBr c) 3,3-dibromo-1,2-dimethylcyclopentene ----> 1. BH3. 2. H2O2, NaOH(1) Which is an isolated diene? (2) Which is an alkene with possible rearrangement product (1,2-H shift) with reaction to HI? (3) Whixh isa diene capable of having 1,2 and 1,4-addition products? (4) Which is a conjugated diene?Predict the major prodcut for the following 4+2 cycloaddiations? Diels-alder reqcrions
- Draw the product formed when diene M undergoes disrotatory cyclization. Indicate the stereochemistry at new sp3 hybridized carbons. Will the reaction occur under thermal or photochemical conditions?Order the following substituents from highest priority to lowest priority: CH3, OH, H,F. Use the Cahn-Ingold-Prelog priority system. a. F, CH3, OH, H b. H, CH3, F, OH c. F, OH, CH3, H d. H, CH3, OH, FDiels–Alder reaction of a monosubstituted diene (such as CH2=CH–CH=CHOCH3) with a monosubstituted dienophile (such as CH2=CHCHO)gives a mixture of products, but the 1,2-disubstituted product oftenpredominates. Draw the resonance hybrid for each reactant, and use thecharge distribution of the hybrids to explain why the 1,2-disubstitutedproduct is the major product.
- Give the structure corresponding to each name.a. (E)-4-ethylhept-3-eneb. 3,3-dimethylcyclopentenec. 4-vinylcyclopentened. (Z)-3-isopropylhept-2-enee. cis-3,4-dimethylcyclopentenef. 1-isopropyl-4-propylcyclohexeneg. 3,4-dimethylcyclohex-2-enolh. 3,5-diethylhex-5-en-3-olWhen 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.Show how to convert cyclopentene into cis-1,2-Cyclopentanediolcompound