Concept explainers
a)
Interpretation:
The chirality centres present in Guaiol are to be indicated by asterisks and the maximum possible number of stereisomers possible is also to be stated.
Concept introduction:
A chirality centre has a carbon attached to four different groups. The maximum number of isomers possible is given by 2n where n is the number of different chiral centres present in the molecule.
To indicate:
The chirality centres present in guaiol are to be indicated by asterisks and to state the maximum possible number of stereisomers for it.
b)
Interpretation:
The chirality centres present in sabinene are to be indicated by asterisks and the maximum possible number of stereisomers possible is also to be stated.
Concept introduction:
A chirality centre has a carbon attached to four different groups. The maximum number of isomers possible is given by 2n where n is the number of different chiral centres present in the molecule.
To indicate:
The chirality centres present in sabinene are to be indicated by asterisks and to state the maximum possible number of stereisomers for it.
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Chapter 27 Solutions
ORGANIC CHEMISTRY-EBOOK>I<
- 27. Which of the following statements about cholesterol is not correct? CH3 CH3 H. d но Cholesterol (a) Cholesterol is a steroid that contains a tetracyclic ring system. (b) Cholesterol is a steroid that contains 8 chiral carbons and can form 28 or 256 stereoisomers. (c) Each atom or group attached to a ring-junction carbon (i.e., carbons a -e) is in a trans or axial position. Because of this the tetracyclic ring system is mostly flat. (d) Cholesterol is used to synthesized vitamin D, bile acids, sex hormones, and adrenocorticoid hormones. (e) Cholesterol is not found in the cell membranes of animals.arrow_forwardLactose contains what number of anomeric carbons and what number of glycosidic bonds: CH2OH ОН CH2OH ОН OH OH OHarrow_forwardDraw and name the seven aldehydes and ketones with the formula C5H10O. Which are chiral?arrow_forward
- 17-74 Glucose, C6H12O6, contains an aldehyde group but exists predominantly in the form of the cyclic hemiacetal shown here. We will discuss this cyclic form of glucose in Chapter 20. A cyclic hemiacetal is formed when the —OH group of one carbon bonds to the carbonyl group of another carbon. (a) Which carbon in glucose provides the —OH group and which provides the —CHO group? (b) Draw the alternative chair confirmations of D-glucose and state which of the two is the more stable.arrow_forwardThe image shows Fischer projections for the structures of four isomers of a ketopentose. CH₂OH CH₂OH CH₂OH ПА пс C=O D HOEC H HOECH CH,OH A C=O H➡ COH но-с-н CH₂OH Which of the structures are stereoisomers of B? B Which of the structures are diastereomers of D? C=O HOI-C-H HOI-C-H CH₂OH с 000 ΤΑ B HO D CH₂OH O Which of the structures are enantiomers of C? H HI COH D CH₂OHarrow_forwardIdentify the chiral centers of the following anti-biotic molecule and name the chiral as R or S. Provide the Fischer projection of R, R isomer. NO, но—с—н H- C-NH-C 0 ČH,OH CHCI,arrow_forward
- Introduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage LearningOrganic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning
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