2. a) Draw the most stable carbocation intermediate for each diene when reacted with HBr. Show resonance structure. Label carbocations as 1°, 2° or 3°. b) Which compound a, b, or c produces the most stable intermediate, and briefly explain why. (. a) HBr HBr 100 18 E HBr
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- Draw the alkene that would react with the reagent given to account for the product formed. ? + H₂O H₂SO4 CH3 CH3 CHCCH3 OH CH3 • 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. Sn [F ChemDoodle6. Provide the line structure of product F in the following reaction. Include stereochemistry for product F as indicated. No mechanism is required. Br2, H20 CH2CI2 Draw any enantiomer (Include stereochemistry)For alkenes A, B, and C: (a) Rank A, B, and C in order of increasing heat of hydrogenation; (b) rank A, B, and C in order of increasing rate of reaction with Hạ, Pd-C; (c) draw the products formed when each alkene is treated with ozone, followed by Zn, H,0. A. B
- Draw the alkene that would react with the reagent given to account for the product formed. ? + H₂O H₂SO4 CH3 CH3CCH3 OH 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. Sn [F ChemDoodleⓇDraw the product of each thermal electrocyclic ring closure. CH3 b. CH3O2C CO,CH3 a. CH2 (2E,4Z,6Z)-2,4,6-0ctatrienea) Draw the mechanism, using good curved arrow notation, for the reaction of 2-methyl-2- butene with bromine in water, omitting any stereochemistry: b) (R)-3-butyn-2-ol is treated with 2 mol of HBr, yielding optically active Compound A (C4H8OBr2). Draw the structure of the reaction with the correct stereochemistry. c) Name Compound A above, including stereochemistry. d) Compound A is treated with HBr to yield Compound B (C4H7Br3). The resulting solution is optically inactive. Draw the product(s) obtained and explain why there is a loss in optical activity.
- For alkenes A, B, and C: (a) Rank A, B, and C in order of increasing heat of hydrogenation; (b) rank A, B, and C in order of increasing rate of reaction with H2, Pd-C; (c) draw the products formed when each alkene is treated with ozone, followed by Zn, H2O.7. a) A) In the box below the arrow, label if the pericyclic reaction is a Diels Alder (DA), Electrocyclic (EC) or Sigmatropic Rearrangement (SR). B) Determine the major product(s). heat HO₂C b) heat to c) + 1. Na, NH3 NO2 NO2 2. heatDraw the alkene that would react with the reagent given to account for the product formed. ? + + H₂O **** H₂S04 • 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. CH3 CH3 CHCCH3 | | OH CH3 +1
- 1. a) Draw the structures of A - D from the following electrocyclic and cycloaddition reactions. hv CH3 heat B A CH3Draw the alkene that would react with the reagent given to account for the product formed. ? + H₂O ● 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. 8 H₂SO4 // CH3 CH3CHCCH3 OH CH3 ? [F Previous Email Instruct1. Draw the product of each of the following [3,3] sigmatropic rearrangements, including its stereochemistry. Ph CH3 (a) H3C. (b) Ph CH3 (c) H3C CO₂CH3 CH3 H (d)