The following reactions use two or more pericyclic steps. Identify all the reactions, and draw reasonable looking transition structures obeying the Woodward-Hoffmann rule. EX エ... H H 330°, 2h 350° CHO CHO CHO H 250° H intermediate
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- Draw a detailed mechanism for the FeBr3@catalyzed reaction of ethylbenzene with bromine, and show why the sigma complex (and the transition state leading to it) is lower in energy for substitution at the ortho and para positions than it is for substitution at the meta position.What will be the major product of the following reaction and what is the likely mechanism for its formation? (CH;);COK Br racemic OCCCH3)3 OCCH3)3 ÓCCCH3)3 A B C D EPredict the product(s) and provide the complete mechanism for each reaction below.
- Draw the mechanism and predict the major product for each of the following reactions. (a) (b) ㅇ (c) 1. KCN, H2O_ ? 1. KCN, H2O ? 1. CH,MgBr, ether 2. NH,CI, H,O 2. H,SO4 2. H2SO4 (d) (e) 1. CuLi .? 2. NH,CI, H,O 1. CH;CH,SNa, ethanol 2. NH,CI, H,OWhich sequence of reactions is expected to produce the product below as the final, and major, organic product? но HO H HOH + enantiomer 1. H2, Lindlar's cat.; 1. H2, Pt, 1. Os04. 1. Na, NH3(1): 1. OsO4; 2. OsO4; 2. OsO4: 2. NAHSO3 H20; 2. OsO4: 2.NaHSO3 H20, 3. NaHSO3/H0 3. NaHSO H20 3. H2, Lindlar's cat. 3. NAHSO3/H20 3. Na, NH3(1) A. B. C. D. E.The SN2 reaction ur 1-chloro-3-methylbutane with hydroxide OH is relatively slow, but it can » be accelerated by the addition of a small amount of Nal. How can this catalysis be explained? (In other words. how is iodide acting as a catalyst?) CONCISELY explain. nd favor and
- Draw the mechanism and the major organic product(s) for each of the following reactions. (а) (b) 1. BH3 THF 1. В.Не Cyclopentylethene ? ? 2. H.О2, NaOH, H.О 2. Н,Ор, NaOH, Н,О (c) (d) 1. Disiamylborane, THF ? 1. Disiamylborane, THF ? 2. H,О2, NaOH, Н,О 2. H,Ог, NaOH, Н,ОThe reactions shown below are substitution reactions. Please state which mechanism they follow, and draw the mechanism of the reaction using mechanistic arrows9.64 For each of the following reactions, provide a complete, detailed mechanism and predict the products, including stereochemistry where appropriate. Determine whether the reaction will yield exclusively one product or a mixture of products. For each reaction that yields a mixture, determine which is the major product. (a) OTs H3C (b) OTs H3C (c) OTs H3C NaCN (CH3)3CONA ? CH;CH,OH DMF DMSO (d) (e) CI CH3 (f) OTs H3C Na,CO3 NaOCH,CH3 ? CH;CH,OH, A CH;CH,OH, A CH3 DMSO, 95 °C
- vesition 1: "From the following electrocyclic cing clousure ceaction, me Heat > me 1.1) give the number of elections involved in this reaction 1.2) does the allowed reaction proceed via a Huckel or a mobius transition State 1.3) does the allowed reaction proceed via a concotatory or discotatory ring Clousure 1.4) is the product provided in the reaction equation below allowed or forbidden H me me vesition 2: • For the following reaction; heat me me 11/HIII. Predict the correct structure the following sigmatropic rearrangement and detailed the appropriate mechanism (Your answer should include an illustration of the transition state of the reaction Take the product's stereochemistry into consideration). Ph Mechanism Ph HeatExplain how and why rearrangements occurduring Friedel-Crafts alkylation reactions formingmore than 1 product. Also illustrate therearrangement reaction from the aboveexample.