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During a total synthesis of 2-methyl-D-erythritol (a sugar of importance to isoprenoid biosynthesis), epoxide 2 was required. ${ }^{11}$ (a) Identify the reagents you would use to achieve a stereoselective synthesis of epoxide 2 from allylic alcohol 1 . (b) Propose a plausible mechanism for the formation of orthoester 4 from epoxide 3 upon treatment with a catalytic amount of aqueous acid. (Hint: The $\mathrm{O}$ in the $\mathrm{C}=\mathrm{O}$ bond of the ester group can function as a nucleophilic center.)
Questions asked
one mole of a perfect gas at 350 K undergoes isothrmal expansion from an initial pressure equal to 8.0 barto 0.8 bar. Clculate W, Q, U ,H and S is the expansion is revesible and of the expansion takes place against zeo external pressure
6. Draw products of the following reaction, alkene with NBS via free radical mechanism. (4pt) Minor product Major product send
If the following elementary reactions represent the mechanism for the decomposition of nitryl chloride (NO₂CI). kı NO₂CI NO₂CI+ CI What is the net reaction? k₂ NO₂ + CI NO₂ + Cl₂ What are the predicted rate laws for each elementary reaction? What is the rate law for the net reaction? (slow) (fast)
Henry R
Numerade educator
21. ( 2 pts) Of the four encircled groups in the compound below, which group is the most basic?
Which of the following does not have a delocalized lone pair? (A) (B) (C) (D) A B C D
G) Higher Boiling point I) L-Aminoacid H) Higher Boiling point J) Zwitterion
5) Complete the following web of reactions. (18 pts) (2 bonus pts if ALL correct) \( \mathrm{NaOH} \) 5) 4) START HERE. 2) \( \mathrm{CH}_{3} \mathrm{CHO} \) 1) 6) ? \[ \stackrel{\mathrm{KMnO}_{4} \longrightarrow}{\longrightarrow} \] 7) \( \mathrm{PCC} \) 3) 2) 9) 8) 14) 15) Benzene \( \mathrm{AlCl}_{3} \) \( \mathrm{C}_{2} \mathrm{H}_{3} \mathrm{OH} \) 10) 16) 17) 11) 12)
\( k= \)
2. For each of the following pairs of substances, predict which member of the pair will have the higher volatility. a. \( \mathrm{NaCl} \) and \( \mathrm{Cl}_{2} \) b. \( \mathrm{SiO}_{2} \) and \( \mathrm{CO}_{2} \) c. \( \mathrm{Cu} \) and \( \mathrm{CO}_{2} \) d. \( \mathrm{NaF} \) and \( \mathrm{Mg} \) e. \( \mathrm{NO}_{2} \) and \( \mathrm{SiC} \) f. \( \mathrm{HCl} \) and \( \mathrm{HF} \) g. \( A r \) and \( N O \)
3.1 Bromination of benzaldehyde leads to the formation of m-bromobenzaldehyde. Write down the chemical rection and explain the formation of the product using resonance intermediates. (14)