Briefly explain why methyl-beta-D-glucopyranoside does not give a positive Benedict’s test, but 4-O-methyl-beta-D-glucopyranoside (the cyclic form...
Briefly explain why methyl-beta-D-glucopyranoside does not give a positive Benedict’s test, but 4-O-methyl-beta-D-glucopyranoside (the cyclic form of glucose with a methyl group substituted for the H on the OH at carbon #4) does give a positive Benedict’s test.
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Briefly explain why methyl-beta-D-glucopyranoside does not give
a positive Benedict’s test, but 4-O-methyl-beta-D-glucopyranoside
(the cyclic form...
CARBOHYDRATES POST-LAB QUESTIONS CONT'D 23.Draw the Haworth structure of lactose and explain why this disaccharide gives...
CARBOHYDRATES POST-LAB QUESTIONS CONT'D 23.Draw the Haworth structure of lactose and explain why this disaccharide gives a positive Benedict's test; make sure to circle the part of the structure that is responsible for the reaction with Benedict's reagent. [5pts) Haworth Projection: (2.5 points) Hemiacetal circled / indicated (2.5 points) CARBOHYDRATES POST-LAB QUESTIONS CONT'D 24. When Benedict's reagent reacts with a reducing sugar, it oxidizes the aldehyde functional group to a carboxylic acid. As seen in the figure below: only a...
Name the following aldoses. (Include in the names the stereochemical designation D or L and, where...
Name the following aldoses. (Include in the names the stereochemical designation D or L and, where appropriate, the configuration of the anomeric carbon, alpha or beta. This question is case-sensitive, so capitalize only the D or L.) ball & stick + labels b all & stick + labels The following model is that of an aldopentose: ball & stick - + labels Draw the alpha anomer of the sugar in its furanose form. Classify each of the following sugars. (For...
why does this positive test turn blue? Negative Positive Select one: O a. O2 reacted with...
why does this positive test turn blue?
Negative Positive Select one: O a. O2 reacted with Na+ in media to Na03 O b. CO2 reacted with Na+ in media to NaCO3 OC. CO2 reacted with Na+ in media to NH3 O d. CO2 reacted with Na+ in media to Naci What does the "T" in SIM-test mean? What bacterial process does it test? Select one: O a. I = immobility. This test shows whether bacteria are motile or not. O...
Complete the following reactions which form ethers (A and B) and cyclic ethers (C-E) as major...
Complete the following reactions which form ethers (A and B) and cyclic ethers (C-E) as major products. SHOW MECHANISMS FOR ALL A) (1R, 2R)1,2-dimethylpropan-1-ol (2 has a dash Methyl and 1 has a wedge methyl) reacts with NaH/CH3CH2Br B) 3-methylpent-3-ene reacts with Hg(OAc)2/ CH3CH2OH, NaBH4 C) 2-cyano-6-methyl cyclohept-1,4,6-triene-4-al reacts with MCPBA/CH2Cl2 D) (2R,3S)- 2-bromo-butan-3-ol reacts with NaOH E) Cyclobutyl as the base chain with (CH2OH attached at Carbon 1 and CH2CH2Br attached at carbon 2) reacts with KOH F) 2-methylcyclohexene...
Name the following aldoses. (Include in the names the stereochemical designation D or L and, where...
Name the following aldoses. (Include in the names the stereochemical designation D or L and, where appropriate, the configuration of the anomeric carbon, alpha or beta. This question is case-sensitive, so capitalize only the D or L.) ball & stick labels ball & stick labels The following model is that of an aldopentose: ball & stick - + labels Draw the alpha anomer of the sugar in its furanose form. • Use the wedge/hash bond tools to indicate stereochemistry where...
2. Briefly explain why ethanol, and not hexane, was used as a solvent in this reaction?...
2. Briefly explain why ethanol, and not hexane, was used as a solvent in this reaction? 3. Why it is necessary to filter the crude coupling product through a column of anhydrous MgSO4? 4. Briefly explain why aryl bromides and iodides, rather than aryl chlorides or fluorides, are typically used as substrates in Pd-catalyzed coupling reactions. 5. Propose a synthesis for the molecule A shown below, using benzene, phenyl boronic acid, tert-butyl bromide and any inorganic reagents needed. A retrosynthetic...
T. How many stereoisomers of beta-D-glucopyranose exist (including itself)? a. 4 e. too many to consider...
T. How many stereoisomers of beta-D-glucopyranose exist (including itself)? a. 4 e. too many to consider b. 8 с. 16 d. 32 onsider the following Fischer projections and answer the questions: CHO H OH HO H H OH H O ČH2OH glucose CHO CHO H OH Но- СНО н H- OH HO OH HO -н -н H- OH H HO -H HO н- H OH ČH2OH H OH CH2OH OH CH OH allose galactose talose 2. Which pair are not...
FINAL REVIEW: o Determine o a) Which test would you use (and why o b) The IV and DV o c) The scales of measure for the IV and DV o d) The two statistical hypotheses. o Researchers suspect that pe...
FINAL REVIEW: o Determine o a) Which test would you use (and why o b) The IV and DV o c) The scales of measure for the IV and DV o d) The two statistical hypotheses. o Researchers suspect that people are more trusting of eople that are considered very attractive by modern eauty standards. To test this, researchers have one group of participants (n- 35) watch an attractive politician give a speech and one group of participants (n -...
Post Lab Questions: 1. Two molecules of glucose, a monosaccharide, when joined together they form a...
Post Lab Questions: 1. Two molecules of glucose, a monosaccharide, when joined together they form a molecule of maltose. Write a chemical reaction to show this process. 2. Write the chemical reaction to show the charring of glucose, C.H.O., which occurs on addition of Conc. H SO. to it. 3. What is the role of Conc. H2SO. in Molisch's reagent test? 4. The positive Biuret test indicates the presence of ....... bond in proteins. 5. Why would amino acids give...
Add the following questions to the final report: a) Why does the carbomethoxy group directs the...
Add the following questions to the final report: a) Why does the carbomethoxy group directs the reaction to positions that are meta to it? b) Why the formation of dinitrobenzaote is substantially disfavored ? c) Would you expect small amounts of the ortho and para substituted product? How would you remove them if they are formed ? d) Why does water have a retarding effect on the nitration ? e) Explain why Benzene has lower reactivity in electrophilic addition reactions...
CARBOHYDRATES POST-LAB QUESTIONS CONT'D 23.Draw the Haworth structure of lactose and explain why this disaccharide gives a positive Benedict's test; make sure to circle the part of the structure that is responsible for the reaction with Benedict's reagent. [5pts) Haworth Projection: (2.5 points) Hemiacetal circled / indicated (2.5 points) CARBOHYDRATES POST-LAB QUESTIONS CONT'D 24. When Benedict's reagent reacts with a reducing sugar, it oxidizes the aldehyde functional group to a carboxylic acid. As seen in the figure below: only a...
Name the following aldoses. (Include in the names the stereochemical designation D or L and, where appropriate, the configuration of the anomeric carbon, alpha or beta. This question is case-sensitive, so capitalize only the D or L.) ball & stick + labels b all & stick + labels The following model is that of an aldopentose: ball & stick - + labels Draw the alpha anomer of the sugar in its furanose form. Classify each of the following sugars. (For...
why does this positive test turn blue?
Negative Positive Select one: O a. O2 reacted with Na+ in media to Na03 O b. CO2 reacted with Na+ in media to NaCO3 OC. CO2 reacted with Na+ in media to NH3 O d. CO2 reacted with Na+ in media to Naci What does the "T" in SIM-test mean? What bacterial process does it test? Select one: O a. I = immobility. This test shows whether bacteria are motile or not. O...
Name the following aldoses. (Include in the names the stereochemical designation D or L and, where appropriate, the configuration of the anomeric carbon, alpha or beta. This question is case-sensitive, so capitalize only the D or L.) ball & stick labels ball & stick labels The following model is that of an aldopentose: ball & stick - + labels Draw the alpha anomer of the sugar in its furanose form. • Use the wedge/hash bond tools to indicate stereochemistry where...
2. Briefly explain why ethanol, and not hexane, was used as a solvent in this reaction? 3. Why it is necessary to filter the crude coupling product through a column of anhydrous MgSO4? 4. Briefly explain why aryl bromides and iodides, rather than aryl chlorides or fluorides, are typically used as substrates in Pd-catalyzed coupling reactions. 5. Propose a synthesis for the molecule A shown below, using benzene, phenyl boronic acid, tert-butyl bromide and any inorganic reagents needed. A retrosynthetic...
T. How many stereoisomers of beta-D-glucopyranose exist (including itself)? a. 4 e. too many to consider b. 8 с. 16 d. 32 onsider the following Fischer projections and answer the questions: CHO H OH HO H H OH H O ČH2OH glucose CHO CHO H OH Но- СНО н H- OH HO OH HO -н -н H- OH H HO -H HO н- H OH ČH2OH H OH CH2OH OH CH OH allose galactose talose 2. Which pair are not...
FINAL REVIEW: o Determine o a) Which test would you use (and why o b) The IV and DV o c) The scales of measure for the IV and DV o d) The two statistical hypotheses. o Researchers suspect that people are more trusting of eople that are considered very attractive by modern eauty standards. To test this, researchers have one group of participants (n- 35) watch an attractive politician give a speech and one group of participants (n -...
Post Lab Questions: 1. Two molecules of glucose, a monosaccharide, when joined together they form a molecule of maltose. Write a chemical reaction to show this process. 2. Write the chemical reaction to show the charring of glucose, C.H.O., which occurs on addition of Conc. H SO. to it. 3. What is the role of Conc. H2SO. in Molisch's reagent test? 4. The positive Biuret test indicates the presence of ....... bond in proteins. 5. Why would amino acids give...
Add the following questions to the final report: a) Why does the carbomethoxy group directs the reaction to positions that are meta to it? b) Why the formation of dinitrobenzaote is substantially disfavored ? c) Would you expect small amounts of the ortho and para substituted product? How would you remove them if they are formed ? d) Why does water have a retarding effect on the nitration ? e) Explain why Benzene has lower reactivity in electrophilic addition reactions...
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