Concept explainers
Interpretation:
The distinguishing test for the given compounds is to be determined.
Concept Introduction:
▸ The pyranoses are six-membered monosaccharide ring structures. The name signifies heterocycle
▸ Pyranoses are the hemiacetals having ring structures of the
▸ Benedict’s test is a typical chemical method used to oxidize aldoses and ketoses. This particular test can be used as a colorimetric analysis tool and a positive or negative test can help in the distinction of different types of carbohydrates. Tollen’s reagent, which is composed of silver nitrate and ammonia can also selectively oxidize
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- 23.1(b,d and e)arrow_forward(1) what reagent is used to convert p-amino phenol to quinone (2) Draw two different kekule's structures for pyrene and under line the more stablearrow_forwardb) 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 MeDgives 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 OH OMe Am OH OMe OMearrow_forward
- The cyclic hemiacetal is more stable than the open-chain form, so very little of the open-chain form is present atequilibrium. Will an aqueous solution of glucose reduce Tollens reagent and give a positive Tollens test? Explain.arrow_forward19 & 20. 19. 20. Consider the following synthetic estrogen shown below O= H Im Compound X The maximum number of stereoisomers in X is Illllllll CH3 a OH CH3 Draw compound X below and prioritize the groups present in the stereocenter labeled as a.arrow_forwardb) 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 Is is MeO MeO MOH OMe mOH OMe OMearrow_forward
- When the gum of the shrub Sterculia setigera is subjected to acidic hydrolysis, one of the water-soluble components of thehydrolysate is found to be tagatose. The following information is known about tagatose:(1) Molecular formula C6H12O6(2) Undergoes mutarotation.(3) Does not react with bromine water.(4) Reduces Tollens reagent to give d-galactonic acid and d-talonic acid.(5) Methylation of tagatose (using excess CH3 I and Ag2O) followed by acidic hydrolysis gives1,3,4,5-tetra-O-methyltagatose.(a) Draw a Fischer projection structure for the open-chain form of tagatose.(b) Draw the most stable conformation of the most stable cyclic hemiacetal form of tagatosearrow_forwardGive a clear handwritten answer with explanation.....arrow_forward22.47 Tertiary amines with three different alkyl groups are chiral but cannot be resolved because pyramidal inversion causes racemization at room temperature. Nevertheless, chiral aziridines can be resolved and stored at room temperature. Aziridine is a three-membered heterocycle containing a nitrogen atom. The following is an example of a chiral aziridine. In this compound, the nitrogen atom is a chiral center. Suggest a reason why chiral aziridines do not undergo racemization at room temperature.arrow_forward
- 21.41 Identify a systematic (IUPAC) name for each of the following compounds: (a) OH (b) NH2 (c) CIarrow_forwardIdentify the hemiacetal function in lactose and show mechanistically how the stereochemistry at that carbon can easily invert, especially in the presence of acids and bases.arrow_forwardProvide the correct structure from the IUPAC name. (a) 2-aminocyclopropanecarboxylic acid (b) 3-mercapto-5-oxoheptanal (c) Propyl 2,2,4-trimethyloct-4-enoate (d) 4-oxocycloheptanecarbaldehyde (e) N,N,4,4-tetraethylhexanamide (f) Acetic pentanoic anhydride (g) Acetyl chloride (h) Methyl 3,3-diethyl-6-octynoatearrow_forward
- Chemistry for Today: General, Organic, and Bioche...ChemistryISBN:9781305960060Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. HansenPublisher:Cengage LearningOrganic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning