Chapter 27: Q 52. (page 1103)
Question: Draw the products of each reaction.
Short Answer
Answer
Chapter 27: Q 52. (page 1103)
Question: Draw the products of each reaction.
Answer
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Get started for freeQuestion: Draw the product of each electrocyclic reaction.
a. the thermal electrocyclic ring closure of (2E,4Z,6Z)-nona-2,4,6-triene
b. the photochemical electrocyclic ring closure of (2E,4Z,6Z)-nona-2,4,6-triene
c. the thermal electrocyclic ring-opening of cis-5-ethyl-6-methylcyclohexa-1,3-diene
d. the photochemical electrocyclic ring-opening of trans-5-ethyl-6-methylcyclohexa-1,3- diene
Question: What product is formed from the sigmatropic rearrangement of the following unsaturated ether?
Question: What type of pericyclic reaction is illustrated in each reaction?
Question: Vitamin , the most abundant of the D vitamins, is synthesized from 7-dehydrocholesterol, a compound found in milk and fatty fish, such as salmon and mackerel. When the skin is exposed to sunlight, a photochemical electrocyclic ring-opening forms provitamin , which is then converted to vitamin by a sigmatropic rearrangement (Section 27.5). Draw the structure of provitamin .
Question: Heating A results in two successive [3,3] sigmatropic rearrangementsโClaisen reaction followed by Cope reactionโto afford ฮฒ-Sinensal, a component of mandarin orange oil. What is the structure of ฮฒ-sinensal?
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