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- Which of the following statements about cycloaddition reactions is not true? Cycloaddition reactions form a cyclic product with two new bonds. The course of the reaction is determined by the symmetry of the molecular orbitals of the products. Cycloaddition reactions are concerted. Cycloaddition reactions are stereospecific.Diels–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.Diels–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 often predominates. Draw the resonance hybrid for each reactant, and use the charge distribution of the hybrids to explain why the 1,2-disubstituted product is the major product.
- True or False: Acetylene is a naturally occurring conjugated diene True or False: The Diels-Alder reaction has the stereochemistry of the dienophile is retained in the product. True or False: When looking at kinetic vs. thermodynamic products the kinetic product predominates at low temperature. True or False: the mechanism of the Diels-Alder reaction is three π bonds break; one σ bond and two π bonds form.Acyclic conjugated dienes may exist in two conformations, as shown below. Based on differences in steric strain, which of the following dienes has the greatest preference for the s-trans conformation? * s-cis s-trans H;C / H;C- CH3 CH3 CH3 H;C- CH3Mechanism The Diels-Alder reaction is part of a class of reactions known as a cycloaddition reaction. This reaction is specifically a [4+2] cycloaddition which is a concerted (one-step) process in which two new carbon - carbon sigma bonds are formed from two pi bonds. For the first Diels - Alder step of the mechanism fill in the arrows needed for the transformation. The rest of the mechanism is drawn for you. OH Show mechanism arrows for this step! 4 + 2 cycloaddition OH H D- & H+ transfer OH Nuc acyl substitution H L.G.
- The two alkenes below react with HI at different rates. CH3CH=CHCH3 and CH₂=CH₂ Draw the structural formula of the MAJOR product formed by the alkene having the HIGHER reaction rate. • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. TAYY [ ] در ChemDoodle ⓇFrom trans-1-chloro-2-isopropylcyclohexane, only 3-isopropylcyclohexene, the less substituted alkene, is formed. Using conformational analysis, explain why this product is observed. Also, will the E2 reaction with trans-1-chloro- 2-isopropylcyclohexane or cis-1-chloro-2-isopropylcyclohexane occur faster under the same basic conditions? CH;O Na* CH3OH CI trans-1-Chloro-2 (R)-3-Isopropylcyclohexene isopropylcyclohexaneChoose 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…
- The bicyclic alkene P can be prepared by thermal electrocyclic ring closure from cyclodecadiene Q or by photochemical electrocyclic ring closure from cyclodecadiene R. Draw the structures of Q and R, and indicate the stereochemistry of the process by which each reaction occurs.Determine the double bond stereochemistry (E or Z) for the following molecules. F. H3C C A CH3 F. H B D BrFor the Diels-Alder reaction, the product's skeletal structure and configuration at the bridgehead carbons are given (and the given wedge bond and dash bond should not be changed). Complete the structure of the major product. Indicate the stereochemistry, by adding two wedge and two dash bonds, at only the fused-ring stereocenters. A Complete the product and clearly show stereochemistry. Select Draw Rings More H G = H C H 0 ° Erase Q2 Q
