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- 18. Provide the mechanism for the following reaction. BnO, TBS 1. Et0, -30°C ZnBr EtO 2. -30°C >RT Me CF3Predict if the following reactions are allowed or forbidden as concerted reactions based on the number of electrons and nodes in the transition state. H H d. heat e. OTBS ОТBS „Ph „Ph H f. Ph Ph OEt Ph, N. CO,Et Ph CO;EI ZnCl2 heat Eto E-z26. Which sequence of reactions would be the best choice to carry out the step below? Но HO а. d. 1. MgBr CI . AICI3 2. Но b. е. 1. / CI . AIC13 CI, AICI3 2. Zn(Hg), HCl с. 1. Br,. FeBr3 2. MgBr
- 17. Identify the major product of the following reaction. Br IN соз Br Br2, FeBr3 Br ? Jos jos Br || IVSECTION 6: Show the mechanism of each reactions with arrows and intermediates form as in a. b. C. HBr Br₂ Cl₂, H₂O Br Br CI Br OHChemistry Section II. Structure and Mechanism 1. a. Sometimes "Polyene" cyclization reactions can be catalyzed by a transition m etal. Provide a mechanism for th below. Pd°Ln Me Me MECN, Et,N Me Me
- Di. ▷ ▷ 2. ▷ 3. ▷ Mechanism? 1.KMnO₂, H₂ SO4 2. H ₂0, Mn.Uz 3. 12 504 MAU₂, H₂SO4 2₁-120,-Mn 504 O 1. H.(104 2. #2504 3. CO₂, HCl, H₂O с LOH Lott LottWhat is the kinetically controlled product in the following reaction? A Br OA. A OB. B О с. с OD. D B Br HBr ?? C Br Br DWhich of the following scheme is the first step in the following Grignard reaction? + I. BrMg I. BrMg + II. :BrMg IV. :BrMg ※套