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- 1. Which of the following is not true about halohydrin formation of alkenes? (a) Water acts as a nucleophile. (b) The water attacks syn to the halide. (c) Water attacks the more substituted carbon. (d) The reaction is often performed in DMSO solvent. alating mGive the necessary reagents in the correct order, as a string of letters Rank the following according to increasing reactivity with 1 as the least reactive, and 4 as the most reactive in a nucleophilic acyl substitution reaction. Briefly explain your answer.
- Q. 8 Define Aldol reaction, is this reaction proceeding via nucleophilic addition or substitution?Identify the electrophile and the nucleophile in each of the following reaction steps and then draw curved arrows to illustrate the bond-making and bondbreaking processes.Explain why quinuclidine is a much more reactive nucleophile thantriethylamine, even though both compounds have N atoms surroundedby three R groups.
- a) Write out the first 3 steps only(to the tetrahedral intermediate shown) in the 6-step arrow pushing mechanism showing how ethyl propanoate is hydrolyzed in acid to form propanoic acidand ethanol. b) NaOH/H2O also serveto hydrolyze an ester; briefly explain why NaOH/H2Ois generally preferable.Propose a reasonable stepwise mechanism, using curved arrow notation to show the flow of electrons, for the following reaction. O₂N H KCN EtOH, H₂O O₂N OH NO₂(d) With reference to the following reaction scheme: H 22 1. Li, NH3, -78 °C BuOH (1 equiv.) 2. NH4CI H "I 23 (i) Explain why only one of the two C-C double bonds in enone 22 is reduced under these reaction conditions. (ii) Draw a curved arrow mechanism for the transformation of 22 into 23.
- Provide the neccessary reagents next to the arrows2. Devise a synthetic strategy to complete the following transformation. a. .CO2H CO2H H2NDetermine if CH3CH2ONa is a suitable reagent to deprotonate the following compound. Explain why. Draw the complete reaction, including the curved arrow mechanism.