Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter31: Immunochemistry
Section: Chapter Questions
Problem 31.75P
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Question
the cyclization of a farnesyl pyrophosphate to give epi-cedrol,
A. Provide a stepwise mechanism for the formation of nerolidyl pyrophosphate from farnesylpyrophosphate
B. Provide a stepwise mechanism for the formation of carbocation 1 from nerolidyl pyrophosphate. Number the backbone carbons of nerolidyl pyrophosphate from 1 to 11 as shown, and include the carbon numbering in your structure of 1
C. Following from B, give an arrow-pushing mechanism to convert 1 to 2 and 2 to 3. Use the backbone carbon numbering from 1 to indicate where carbon atoms ended up in 2 and 3
D. In addition to forming epi-cedrol, carbocation 3 gives three minor byproducts: a diastereomeric alcohol and two alkenes. Draw mechanisms that could give rise to these three products
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