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문제 71a
For each of the following compounds, indicate whether or not it can exist as cis–trans stereoisomers. If it can exist as the two isomers, draw both as a condensed structure.
(a) H2C=CHCH2CH3
문제 71d
For each of the following compounds, indicate whether or not it can exist as cis–trans stereoisomers. If it can exist as the two isomers, draw both as a condensed structure.
(d)
문제 72c
For each of the following compounds, indicate whether or not it can exist as cis–trans stereoisomers. If it can exist as the two isomers, draw both as a condensed structure.
(c)
문제 73
The structure of vitamin A is shown in Problem 4.54. Is the double bond nearest the ring on the carbon chain cis or trans?
문제 74
The vision process in animals involves the change of one double bond in retinal from its cis form to its trans form. The structures of cis and trans retinal are shown below. Label which is cis and which is trans.
문제 75c
Determine whether each of the following is the cis or the trans stereoisomer:
(c)
문제 76b
Determine whether each of the following is the cis or the trans stereoisomer:
(b)
문제 77
Draw the skeletal structure and give the name and omega number of the following fatty acid:
CH3CH2CH2CH2CH2HC=CHCH2HC=CHCH2CH2CH2CH2CH2CH2CH2COOH
문제 79a
Mark the chiral centers in the following molecules, if any, with an asterisk (*).
(a)
문제 79d
Mark the chiral centers in the following molecules, if any, with an asterisk (*).
(d)
문제 80d
Mark the chiral centers in the following molecules, if any, with an asterisk (*).
(d)
문제 81c
Are the following compounds structural isomers, cis–trans isomers, or enantiomers?
(c)
문제 82c
Draw the enantiomer of each of the following compounds. If the compound is not chiral, state that fact.
(c)
문제 83
Certain omega-3 fatty acids can be found only in animal sources, such as fatty fish. Two of these are eicosapentaenoic acid (EPA) [20:5] and docosahexaenoic acid (DHA) [22:6], both of which are ω-3 fatty acids. DHA has been shown to be important in healthy brain development, so it has recently been added to infant formulas. Breast milk is rich in DHA as long as the mother maintains a healthy diet that includes fish. Draw skeletal structures of the fatty acids EPA and DHA.
문제 84b
For each pair of molecules, identify the pair as:
A. structural isomers.
B. the same molecule (conformational isomers).
C. cis–trans stereoisomers.
D. different molecules.
(b)
