5. Provide a step-by-step mechanism to account for the product of each of the following reactions. Show the structure of each of the intermediates and use curved arrows to indicate electron flow in each of these steps. a) H-O, Na OMe (cat.) MeOH
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- HW Write a mechanism for the reaction shown below. Show all intermediates and use curved arrows to show electron flow. H3C 1. H₂SO4 cat. EtOH 2. Propose an efficient synthesis of the following compound. ???Help In finding the major organic products for these reactions + NaOCH2CH3 1. add slowly 2. HCI b) 1. NaOCH, CH3OH 2. (CH3)2CHCH2CH₂Br 3. H3O+, heat4. Devise concise syntheses for the following transformations. Clearly show the reagent and product for each step. The first three syntheses can be accomplished in two steps whereas the last synthesis requires three steps. a. Br b. H... HO OH CH3 H3C H
- 4. Provide the mechanism for this reaction: H3C O cat H* (CH,CH,)NH -Z N CH3Heck reactions take place with alkynes as well as alkenes. The following conversion involves an intramolecular Heck reaction followed by an intermolecular Heck. Work out the reaction sequence on a separate sheet of paper, and then draw the structure of the palladium-containing intermediate A. 1% mol Pd(OAc)₂2 CO₂Me 4% mol Ph P CH₂CN A (1 ring) C (2 rings) (2 rings) • Consider E/Z stereochemistry of alkenes. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • Use R1 to represent the palladium complex. The R group tool is located in the charges and lone pairs drop-down menu. 0- ✪ Sn [F MeO₂CStep 4a: Classify step. The target product is present, but the reaction is not over. The ethoxide ion has been regenerated. :0: :0: What is the key process in the next step of the mechanism? proton transfer formation of a o bond between nucleophile and electrophile loss of a leaving group carbocation rearrangement (e.g., methyl or hydride shift)
- 2) Write the major products A- P for each of the following reactions. d) H,O/ H* concd. H,SO4 Br/ CCl, excess NaNH2 K M heat NH3The following reaction can potentially produce three different cyclized products. 1. NaOMe, MeOH MeO cyclization products 2. acidic workup Provide the structures of the three cyclization products. Label the products as A, B, and C. Circle the major product. Five and six membered rings form preferentially over smaller and larger'rings.#16f. Provide the missing reactants, reagents, or products for the following reaction sequences below.
- 6). What is the major product of the following reactions? (A) -? coon 1). NaOH in ErOH, then H,O+ 2). 1 eqiv. NaOEt 3). 1 equiv. CH3Br 4). H₂O*, Heat COOB (Intramolecular Claison) COOE (B) CH₂ COOH (D) CH₂ (E) CH3 CH₂3. Draw the systematic reaction mechanism for between the reaction of isoamyl alcohol and acetic acid What are the products? What is the functional group of the major product? Does it have a scent? If so, wha is the scent smells like? Choelie on Donio to malke dninl S 00/ ethang1. lohonatou Ilawe:This is the general mechanism of nucleophilic addition of aldehydes and ketones. Nu: Nu- H-Nu Nu-Ċ-0-H + Nu: Represent the mechanism with the energy diagram showing the transition states and the intermediate.