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- I H Ph Br In an E2 elimination reaction, the leaving group and the hydrogen atom must be anti-coplanar for this concerted reaction to occur. ||| Identify which of the following structures has the hydrogen atom and the leaving group aligned anti-coplanar. CH3 Ph Ph H TI F H || OH H Ph H CH3 CH3 Br Ph Br A) I B) II C) III2 Use FMO and aromatic transition State theories show that [4+2] -1 [4.2 ] TT S Egcloaddition reactions are forbidden.QUESTION 2c below. Your structure should clearly indicate any regiochemistry / stereochemist Draw the major product of the Diels-Alder reaction for th Briefly explain the origin of any regiochemistry / stereochemistry in the major pro sentence maximum / structures may help!). OCH₂ OCH3 CN A
- 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 CH3OH3) Explain how and why the reaction below results in the observed regiochemistryand/or stereochemistry.The picture below shows the transition state and reaction coordinate diagram for one step in a chemical change. Draw all the products of this step. Make sure to include all nonzero formal charges.
- OChem help with the following reaction schemes (see attached image) Please provide the bond line structures for the products obtained in the following reaction schemes... Notice in question #1 that A, B, and C are actually shown as C, B, and finally A in the actual reaction scheme so C correlates with PCC, and so on Question #2 is in order.] Draw the structure of Diels-Alder cycloadduct formed via an endo 3. [a, transition state structure involving the diene and dienophile shown here. [b Formulate the endo transition structure that leads to the product. [c is observed. Does it correspond to a primary or a secondary KIE? Explain. [d. the 'inverse' variety? Explain. -CO2ET ]A KIE ] Is the KIE of the 'normal' orDraw the product of the below reaction, a mechanism and a Molecular Orbital ergy diagram for it. Indicate which levels are used for the reaction. MeO2C hv (light) MeO₂C
- 4. For the following reactions, develop a transition-state structure using molecular models which would account for the observed stereoselectivity. Also, describe the type of pericyclic reactions using the proper terminology. (each Br heat A & Br b) F 0°C F heat heat d) product? =& & MeO₂C OCH3 H HO 1. CO₂Me مر CO₂Me LOCH3 heat heat MeO₂C HOWhat is the product E and how is it formed? Can this be explained using frontier molecular orbital analysis? What would the regiochemistry and stereochemistry be?Identify the major product of the reaction of an alkene shown below. ||| 1. Hg(OAc)2, H2O 2. NaBH4, NaOH ....... ОН || IV ОН о, ОН