Concept explainers
(a)
Interpretation:
The trisubstituted pi bond and its configuration have to be identified and given.
Concept Introduction:
Z-isomer: when two groups with higher priorities are on same side of
E-isomer: when two groups with higher priorities are on opposite side of alkene double bond, then it is called as E-isomer. Priority depends on atomic number of atoms. Greater the atomic number, higher the priority.
(b)
Interpretation:
The total number of possible stereoisomers for pladienolide B has to be described.
Concept Introduction:
Stereo isomers: These are isomers, which are having same molecular formula but differ in their spatial arrangement. The number of stereoisomers in a compound with n number of stereocenters are
(c)
Interpretation:
The enantiomer of pladienolide B has to be drawn.
Concept Introduction:
Enantiomers: These isomers are non-superimposable mirror images. Enantiomers have same physical and chemical properties, but their ability to rotate plane-polarized light (+/-) by equal amounts are in opposite directions.
(d)
Interpretation:
The diastereomer identical to pladienolide B except for chiral center connected to ester oxygen has to be drawn.
Concept Introduction:
Diastereomers: These isomers are non-superimposable and not mirror images. It occurs when stereoisomers of a compound have different configuration at stereocenters and are non-mirror image.
(e)
Interpretation:
The diastereomer identical to pladienolide B except for configuration of disubstituted pi bond outside the ring has to be drawn.
Concept Introduction:
Diastereomers: These isomers are non-superimposable and not mirror images. It occurs when stereoisomers of a compound have different configuration at stereocenters and are non-mirror image.
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