4. Draw the major 1,2- and 1,4-addition products of the following reactions? For each reaction indicate the kinetic and the thermodynamic products (1 a) b) HBr HBr ROOR ROOR
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- 12) Use the curved arrow formalism to show the movement of electron pairs in the following reaction and label each reactant as a nucleophile or an electrophile. CHÍNH CHỊCH, + CO Học Nha CH₂CH₂CIWhich statement is false regarding the following system? + HX Addition Elimination H -X O A positive AG means that the equilibrium will favor the reactants because the entropy term is larger than the enthalpy term representing the gain of entropy when one molecule becomes two. O A negative AG means that the equilibrium will favor the products because the enthalpy term is larger than the entropy term representing the loss of entropy when two molecules become one. Elimination reactions are thermodynamically favored at high temperatures, where the entropy of the reaction will be larger than the enthalpy, causing a positive AG and the reactants to be favored over the products. Addition reactions are thermodynamically favored at high temperatures, where the entropy of the reaction will be larger than the enthalpy, causing a positive AG and the reactants to be favored over the products.In the presence of light or heat, diazomethane (CH,N2) creates a carbene, which then adds to an alkene to make a cyclopropane. In the boxes below. draw the mechanism arrows for the reaction. H INEN: INE N:
- a Draw the structure of the intermediate (I) for the reaction below. Hg(O2CCH3)2 NaBH4 Product CH;OH H3C • Use the wedge/hash bond tools to indicate stereochemistry where it exists. If the reaction produces a racemic mixture, just drawv one stereoisomer.When benzyl bromide is treated separately with KI and CH3OH, the substitution products are different but the reaction rates are about the same. KI Br (a) What does this suggest about the mechanism-is it SN1 or SN2? Explain. (b) Draw the complete mechanism (including curved arrows) for the formation of each product. (c) If the concentration of KI were doubled, what would happen to the rate of the substitution reaction? HOCH3 ?5) Draw two reasonable resonance structures and the hybrid of the intermediate formed in the following reaction. H H NBS hot CC14
- b) Which of the flowing reactions will have the faster rate and give a better yield? Use drawings of the transition state (show orbitals!) to explain why. Br NaOCH3 CH3OH Br NaOCH3 CH3OH(1R,2R)-1-Bromo-2-methylcyclopentane is reacted with sodium methoxide. Given the product(s) and show the reaction mechanism, including the depiction of the transition state. Draw an energy diagram for this conversion.Draw an energy diagram for the addition of hydrobromic acid to pent-1-ene. Two products formin this reaction; draw the curves for both. Label the positions of the reactions, intermediates,and products. What is the name of the product that forms from the curve that has the higher-energy carbocation intermediate? What is the name of the product that forms from the curvethat has the higher-energy first transition state?The product of both the higher-energy carbocation intermediate and higher-energy first transitionstate is 1-bromopentane.
- What is the relationship between the products formed in the SN1 reaction below? Options: Structural isomers Enantiomers Diastereomers Identicalneed help with this problem predict the major products. A-CThe equilibrium constant for reversible reactions is equal to a) [Products]/[Reagents] [Reagents] [Reagents] [Productsb) [Reagents]/[Products] [Products]/[Reagents].c) [Products]/[Products].