Q4 B-Damascenone belongs to a family of fragrant natural products called rose ketones tha have þeen used in the perfume industry. In one synthesis of B-damascenone, the reaction o COuiyalent of MCPBA afforded two constitutionally isomeric epoxides JODIerted into diol 4 upon treatment with aqueous nochanism that converts each that

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Q4 B-Damascenone belongs to a family of fragrant natural products called rose ketones that
have been used in the perfume industry. In one synthesis of B-damascenone, the reaction of
compound 1 with one equivalent of MCPBA afforded two constitutionally isomeric epoxides
(compounds 2 and 3), which were then converted into diol 4 upon treatment with aqueous
acid. Identify the structures of epoxides 2 and 3, and propose a mechanism that converts each
of them into compound 4 in the presence of H,O*. (Note: It is reasonable to presume that a
protonated epoxide can open by itself, without the involvement of a nucleophile, if doing so will
give a resonance-stabilized allylic carbocation intermediate.)?
OCH,
OH OCH3
H,O
2+3
MCPBA
(one equiv.)
4
OH
B-Damascenone
Transcribed Image Text:Q4 B-Damascenone belongs to a family of fragrant natural products called rose ketones that have been used in the perfume industry. In one synthesis of B-damascenone, the reaction of compound 1 with one equivalent of MCPBA afforded two constitutionally isomeric epoxides (compounds 2 and 3), which were then converted into diol 4 upon treatment with aqueous acid. Identify the structures of epoxides 2 and 3, and propose a mechanism that converts each of them into compound 4 in the presence of H,O*. (Note: It is reasonable to presume that a protonated epoxide can open by itself, without the involvement of a nucleophile, if doing so will give a resonance-stabilized allylic carbocation intermediate.)? OCH, OH OCH3 H,O 2+3 MCPBA (one equiv.) 4 OH B-Damascenone
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