Tre 2.) Given the final product and reagents for each step in the forward synthesis of this cyclohexane-containing internal alkyne, please propose the structures for the synthetic intermediates A-E below.
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- Chemistry Q: Kindly explain the striking observation that methylation of the alcohol 1 leads to a methoxy compound in which the stereochemistry of the oxygen has changed. Explain it by providing a mechanism accounting for the transformation. (write legibly pls).When 3-methyl-1-butene is reacted with 9-borabicyclo[3.3.1]nonane, the "1-ol" product is formed. What is the detailed reactin scheme for the transformation? Describe the purification procedure.Explainwhythefollowingdeuterated1-bromo-2-methylcyclohexaneundergoes dehydrohalogenation by the E2 mechanism, to give only the indicated product. Two other alkenes are not observed.
- Elimination occurs when (Z)-3-bromohex-3-ene is treated with NaNH2. Under the same conditions, 1-bromocyclohexeneundergoes elimination much more sluggishly. Explain whyThe hydrobrominationof 2-methyl-1-butene could theoretically lead to 2 different alkyl bromides; in practice only one product is formed. Draw the structure of both theoretical products, circle the one that is actually produced, and briefly explain whyonly one product forms.Predict major and minor products of bicyclo[4.4.0]dec-4-ene when reacted with NBS in peroxide.
- Please identify priorities of functional groups and name following molecules based on thier stereochemistry as R or SDraw all of the substitution and elimination products formed from thegiven alkyl halide with each reagent: (a) CH3OH; (b) KOH. Indicate thestereochemistry around the stereogenic centers present in the products,as well as the mechanism by which each product is formed.How can X be prepared from a constitutional isomer by a series of [2 + 2]cycloaddition reactions? Interest in molecules that contain severalcyclobutane rings fused together has been fueled by the discovery ofpentacycloanammoxic acid methyl ester, a lipid isolated from themembrane of organelles in the bacterium Candidatus Brocadiaanammoxidans. The role of this unusual natural product is as yetunknown.
- There are two isomeric cyclohexa-1,4-diene products when toluene undergoes the Birch reduction (see Problem 25.24). (a) Draw the mechanism that leads to the formation of the major product. (b) Will the Birchreduction of toluene occur faster or slower than the Birch reduction of benzene itself? Hint: Is –CH3 an electron-donating or an electron-withdrawing group?2. In not more than three (3) sentences, explain why terminal alkynes are acidic.3. What impurities are removed when acetylene gas is made to pass through an acidifiedsolution of CuSO4?4. Explain the difference in the rate of free radical bromination reactions of toluene and cyclohexane.How many alkenes yield 2,3−dimethylbutane on catalytic hydrogenation?