9) Using curved arrows to indicate electron movement, propose a mechanism tor the following transformation. Be sure to draw all intermediate species that are formed throughout the process. TSOH, 100 °C HO. + H20 HO
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- Consider the attached E2 reaction What happens to the reaction rate with each of the following changes?[1] The solvent is changed to DMF. [2] The concentration of −OC(CH3)3 is decreased. [3] The base is changed to −OH. [4] The halide is changed to CH3CH2CH2CH2CH(Br)CH3. [5] The leaving group is changed to I−.Complete the reaction scheme below. Show all reagents and intermediates. No reaction is a possible answer. 1) CH3CH2M9B CH3OH H+ (ехcess) но 2) H30*, H2O B A OCH3Give a reasonable mechanism for this reaction. Explain why it is exothermic. H+ хо Дон H2O
- When ethoxybenzene is treated with a mixture of nitric acid and sulfuric acid, two products are obtained, each of which has the molecular formula C8H9NO3. For the mechanism, draw the curved arrows as needed. Include lone pairs and charges in your answer. Do not draw out any hydrogen explicitly in your products. Do not use abbreviations such as Me or Ph.Curved arrows are used to illustrate the flow of electrons. Follow the curved arrows and draw the product of this elementary step in an E1cb mechanism. Include all lone pairs. Ignore stereochemistry. Ignore methanol and inorganic byproducts. :ÖH CH30: H Na heat :O: (+ H NaOCH3 Drawing QA carbamate can be prepared by treating an isocyanate with an alcohol, as shown here. This type of reaction is used to synthesize polyurethanes- polymers that have a wide variety of industrial applications, such as surface sealants, high-performance adhesives, and synthetic fibers. Propose a mechanism for this transformation. R'—ОН R. `N=C=0 R. OR' An isocyanate A carbamate (Substituted urethane) O=C
- Provide the mechanism for the following reaction. CI , AIC3All rearrangements we have discussed so far have involved generation of an electron-deficient carbon followed by a 1,2-shift of an atom or a group of atoms from an adjacent atom to the electron-deficient carbon. Rearrangements by a 1,2-shift can also occur following the generation of an electron-deficient oxygen. Propose a mechanism for the acid-catalyzed rearrangement of cumene hydroperoxide to phenol and acetone.When acetone is dissolved in either a slightly basic or a slightly acidic solution of oxygen-18 labeled water, H2180, oxygen-18 labeled acetone, (CH3)2C=180, is produced. This is a form of an isotopic exchange reaction between acetone and water. Provide a mechanism to account for this reaction in (a) basic solution and (b) acidic solution. Hint: Is the addition of the nucleophile reversible or irreversible? 180 + H,180 CH3 + Hо `CH3 Acid or base H3C H3C
- The following reaction involves two sequential Heck reactions. Draw structural formu- las for each organopalladium intermediate formed in the sequence and show how the final product is formed. Note from the molecular formula given under each structural formula that this conversion corresponds to a loss of H and I from the starting material. Acetonitrile, CH,CN, is the solvent. 1% mol Pd(OAc), 4% mol Ph,P CH,CN C4H171 C4H16Provide a curved-arrow mechanism for the following reaction. Be sure to use your mechanism and a few words to explain the regiochemistry of the product. Brz но CH,Cl, BrGive a detailed reaction mechanism for the reaction expected to occur when 2-bromo-2-methylpentane is heated with sodium methoxide. Draw clear structural formulas of all relevant species and use curved arrows to represent electron flow. Also indicate which step is likely to be rate-determining. The answer you sent before will be used for this question.