22. Which of the following terms describes the mechanism of a Claisen rearrangement reaction? (A) Electrophilic addition (B) Nucleophilic addition (C) syn Elimination (D) Radical substitution (E) Pericyclic reaction

19. When a carbonyl is part of a conjugated π-network, the C=O stretch: (A) has a higher frequency than in a nonconjugated system. (B) has a lower frequency than in a nonconjugated system. (C) always occurs at 1710 cm-1 . (D) occurs around 2700 cm-1 . (E) cannot be distinguished from the C=O stretch in a nonconjugated system.

22. Which of the following terms describes the mechanism of a Claisen rearrangement reaction? (A) Electrophilic addition (B) Nucleophilic addition (C) syn Elimination (D) Radical substitution (E) Pericyclic reaction

其他試題

22. Which of the following terms describes the mechanism of a Claisen rearrangement reaction?
(A) Electrophilic addition
(B) Nucleophilic addition
(C) syn Elimination
(D) Radical substitution
(E) Pericyclic reaction