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.
Want to see the full answer?
Check out a sample textbook solutionChapter 27 Solutions
Organic Chemistry
- ? SAQ 11-3 Draw the Fischer projections for the enantiomers of the following molecules. a. b. H₂C-CH-COOH C-pr-c Br 2-bromopropanoic acid H₂C-CH-COOH 1 NH₂ alanine HOCH2 - CHỊ CHO 1 OH glyceraldehydearrow_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_forwardDraw and name the seven aldehydes and ketones with the formula C5H10O. Which are chiral?arrow_forward
- Assign the absolute configuration of the chiral centers of the following compounds. The number of the chiral centers of each compound is already indicated. Redraw the structures in your answer sheet. Please show your complete solution in assigning the absolute configuration of these chiral centers. он OH но, но. `NH2 CH2OH H NH2 но Ascorbic Acid Asparagine one (1) chiral center two (2) chiral centersarrow_forwarda) The D-aldopentose A, C5H1005, reacts with HNO3 to yield an optically active aldaric acid B. Kiliani-Fischer chain extension of A produces a pair of D-aldohexoses C and D. C is converted by HNO3 to an optically active aldaric acid, but D is converted by HNO3 to an optically inactive aldaric acid. Write acyclic Fischer projections for A, B, C, D. b) Disaccharide E is a reducing sugar. It is hydrolyzed by an α-glycosidase enzyme, which means it contains an α- glycoside link. Treatment of E with Ag2O and excess Mel gives an octamethyl derivative F. Hydrolysis of F in dilute aqueous acid gives the pair of molecules shown below. Write the structures of E and F. (If the stereochemistry at a particular carbon is not determined by the above data, indicate this with a wavy line as shown below.) HO OMe OMe MeO MeO MOH OMe mOH OMe OMearrow_forwarda) The D-aldopentose A, C5H1005, reacts with HNO3 to yield an optically active aldaric acid B. Kiliani-Fischer chain extension of A produces a pair of D-aldohexoses C and D. C is converted by HNO3 to an optically active aldaric acid, but D is converted by HNO3 to an optically inactive aldaric acid. Write acyclic Fischer projections for A, B, C, D.arrow_forward
- The 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_forwardTwo sugars differing in configuration at a single asymmetric carbon atom are known as epimers. D-mannose is a C-2 epimer of glucose (Structure I), while D-galactose is a C-4 epimer of glucose. Structure Il and IIl are H- -OH но- -H H OH HO H но- H HO H H -OH H- -OH HO OH H -OH H- -OH H OH HO. HO, OH II II Which of the following represents an aldopentose? OH H O HO O HO H но н HO H но- HO H HO H HO- H OH H OH H OH H OH OH HO Он of но" HO O OH он III IV These are chemical messengers that are secreted by endocrine glands and carried through the bloodstream to target tissues. prostaglandin deoxysugar glycoside hormones Which of the following is NOT correctly paired? cellulose: beta-1,4-glycosidic linkage amylose: alpha-1,4-glycosidic linkage chitosan: alpha-1,4-glycosidic linkage cellubiose: beta-1,4-glycosidic linkagearrow_forwardIdentify the relationship between these two structures. F OH НО. CH3 H CH3 H H₂C- H₂CH Diastereomers The same compounds O Unrelated compounds O Enantiomers יד -H F Iarrow_forward
- The most stable conformation of the pyranose ring of most D-aldohexoses places the largest group, CH2OH, in the equatorial position. An exception to this is the aldohexose D-idose. Draw the two possible chair conformations of either the a or ß anomer of D-idose. Explain why the more stable conformation has the CH2OH group in the axial position.arrow_forwardHW11 #24arrow_forwardVII. Place asterisks at all the chirality centers in the molecule below. O || CH;CHCNH NH₂ cephalexin N S. CO₂H CH3arrow_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