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9. Reactions involving Enolates Ketones E) B-dicarbonyl Aldol: best with aldehydes Aldol addition...
(5) (9 points) Reactions involving aldehydes and ketones. In the text boxes below, indicate the most...
(5) (9 points) Reactions involving aldehydes and ketones. In the text boxes below, indicate the most Teasonable product(s) for each reaction from the list of structures (A-H) in the box at the right. H.CO - YY (b) Product from (a) + TH
5. Ester enolates (as well as enolates from ketones) are often best generated using sterically hindered...
5. Ester enolates (as well as enolates from ketones) are often best generated using sterically hindered bases such as t-butoxide, since a bulky base will be less likely to act as a nucleophile and attack the carbonyl carbon. Give the enolates generated by the following bulky bases, then show the product of enolate alkylation. (Hint – the second step is an SN2 reaction.). The first one is done as an example. Be sure to count your carbons! Br + LIEN...
can someone answer these 3 questions? 1. What type of reaction can the following molecule have?...
can someone answer these 3 questions?
1. What type of reaction can the following molecule have? A. Michael Addition B. 1,4 Addition C. 1,2 Addition D. Both A and B E. All of the above 2. What is the Claisen Condensation? A. Aldol Condensation of aldehydes B. Aldol Condensation of Ketones C. Aldol Condensation of Esters D. Both A and B E. None of the above 3. Which class of compounds will have the higher boiling points? A. Aldehydes B....
9) 9) Why do aldehydes undergo nucleophilic addition reactions, whereas esters undergo nucleophilic acyl substitution reactions?...
9) 9) Why do aldehydes undergo nucleophilic addition reactions, whereas esters undergo nucleophilic acyl substitution reactions? A) The carbonyl carbon of an ester is more electrophilic than that of an aldehyde. B) Once the nucleophile adds to an aldehyde, neither H- nor R-can be eliminated because they are strongly basic. C) Aldehydes are more sterically hindered than esters. D) The ester carbonyl carbon is sp3 hybridized while the aldehyde carbonyl carbon is sp2 hybridized. E) Once the nucleophile adds to...
Can I have help with these four question? thanks in advance! 22. Robeson Annulation reaction has...
Can I have help with these four question? thanks in
advance!
22. Robeson Annulation reaction has what type of mechanism? A. Aldol Condensation B. Dieckman Condensation C. Michael Addition followed by Aldol condensation D. Both A and B E. none of the above 23. What type of reaction can the following molecule have? A. Michael Addition B. 1.4 Addition C. 1,2 Addition D. Both A and B E. All of the above 24. What is the Claisen Condensation? ownWS A....
1. The reaction web includes most of the reactions of enolates we have studied. The products...
1. The reaction web includes most of the reactions of enolates we have studied. The products of these reactions can be treated with other reagents to generate new functionality - think synthesis! Make up your own examples - e.g. What if you treated compound D with CH,MgBr? In the table, summarize the types of products produced from these reactions. CH3 MgBr acid quench acid quench NaOH, H2O EIO OEt acid quench acid quench acid quench D LIAIHA acid quench acid...
1. The aldol condensation reaction belongs to a group of reactions characterized by formation of an...
1. The aldol condensation reaction belongs to a group of reactions characterized by formation of an enolate. For each of the following aldehydes or ketones, draw the enolate ion that forms when treated with a strong base such as sodium hydroxide. If an enolate cannot form, put NR (no reaction). 2. The first step in the aldol addition of acetaldehyde is an acid base reaction (proton transfer). pka = 16 pka = 15 OH a. The pk, for each acid...
1) What is the product of the following aldol addition of two aldehydes reaction Өон CH.CH.CH...
1) What is the product of the following aldol addition of two aldehydes reaction Өон CH.CH.CH сн,сн: снҫнн CH. B) CH:CH.CHCHH сн: Сн, он cң, сн: сненнн СН: D) cң, сн: Снінен CH₃CH: E) он cң, cң сн: Снінен сн: 2) Draw the enone product of the following reaction: HO, HO, 3 HC CH HỌC CH 3) What is the product of the following crossed aldol addition reaction? "ОН CH, CHỊCH + H C H (excess) CH3CH2CHCH IV. CH3CHCH Сн,он...
This experiment was based on Aldol-dehydration reaction using unknown aldehydes and ketones. We carried out an...
This experiment was based on Aldol-dehydration reaction using
unknown aldehydes and ketones. We carried out an aldol condensation
between an unknown aldehyde and an unknown ketone. Here are the
list of possible unknown aldehydes and ketones that were used.
Here is the NMR of the final product. Please predict the
structure given the melting point is 163 degrees Celsius.
The analysis of the 1H NMR spectrum should include a detailed
assignment of each of the NMR resonances to the protons...
Nitrogen nucleophiles have different outcomes in reactions with aldehydes and ketones, after formation of the tetrahedral...
Nitrogen nucleophiles have different
outcomes in reactions with aldehydes and ketones, after formation
of the tetrahedral intermediate and depending on the type of
nucleophile (1o, 2o or 3o).
Provide the products formed by the
reaction of acetaldehyde and 2-butanone with the following nitrogen
nucleophiles.
a.
b.
c.
d.
,H t, pH 4-5 ,H +, pH4-5 N' II ., pH 4.5 N H O,N NO2 2, 4-dinitrophenylhydrazine
(5) (9 points) Reactions involving aldehydes and ketones. In the text boxes below, indicate the most Teasonable product(s) for each reaction from the list of structures (A-H) in the box at the right. H.CO - YY (b) Product from (a) + TH
5. Ester enolates (as well as enolates from ketones) are often best generated using sterically hindered bases such as t-butoxide, since a bulky base will be less likely to act as a nucleophile and attack the carbonyl carbon. Give the enolates generated by the following bulky bases, then show the product of enolate alkylation. (Hint – the second step is an SN2 reaction.). The first one is done as an example. Be sure to count your carbons! Br + LIEN...
can someone answer these 3 questions?
1. What type of reaction can the following molecule have? A. Michael Addition B. 1,4 Addition C. 1,2 Addition D. Both A and B E. All of the above 2. What is the Claisen Condensation? A. Aldol Condensation of aldehydes B. Aldol Condensation of Ketones C. Aldol Condensation of Esters D. Both A and B E. None of the above 3. Which class of compounds will have the higher boiling points? A. Aldehydes B....
9) 9) Why do aldehydes undergo nucleophilic addition reactions, whereas esters undergo nucleophilic acyl substitution reactions? A) The carbonyl carbon of an ester is more electrophilic than that of an aldehyde. B) Once the nucleophile adds to an aldehyde, neither H- nor R-can be eliminated because they are strongly basic. C) Aldehydes are more sterically hindered than esters. D) The ester carbonyl carbon is sp3 hybridized while the aldehyde carbonyl carbon is sp2 hybridized. E) Once the nucleophile adds to...
Can I have help with these four question? thanks in
advance!
22. Robeson Annulation reaction has what type of mechanism? A. Aldol Condensation B. Dieckman Condensation C. Michael Addition followed by Aldol condensation D. Both A and B E. none of the above 23. What type of reaction can the following molecule have? A. Michael Addition B. 1.4 Addition C. 1,2 Addition D. Both A and B E. All of the above 24. What is the Claisen Condensation? ownWS A....
1. The reaction web includes most of the reactions of enolates we have studied. The products of these reactions can be treated with other reagents to generate new functionality - think synthesis! Make up your own examples - e.g. What if you treated compound D with CH,MgBr? In the table, summarize the types of products produced from these reactions. CH3 MgBr acid quench acid quench NaOH, H2O EIO OEt acid quench acid quench acid quench D LIAIHA acid quench acid...
1. The aldol condensation reaction belongs to a group of reactions characterized by formation of an enolate. For each of the following aldehydes or ketones, draw the enolate ion that forms when treated with a strong base such as sodium hydroxide. If an enolate cannot form, put NR (no reaction). 2. The first step in the aldol addition of acetaldehyde is an acid base reaction (proton transfer). pka = 16 pka = 15 OH a. The pk, for each acid...
1) What is the product of the following aldol addition of two aldehydes reaction Өон CH.CH.CH сн,сн: снҫнн CH. B) CH:CH.CHCHH сн: Сн, он cң, сн: сненнн СН: D) cң, сн: Снінен CH₃CH: E) он cң, cң сн: Снінен сн: 2) Draw the enone product of the following reaction: HO, HO, 3 HC CH HỌC CH 3) What is the product of the following crossed aldol addition reaction? "ОН CH, CHỊCH + H C H (excess) CH3CH2CHCH IV. CH3CHCH Сн,он...
This experiment was based on Aldol-dehydration reaction using
unknown aldehydes and ketones. We carried out an aldol condensation
between an unknown aldehyde and an unknown ketone. Here are the
list of possible unknown aldehydes and ketones that were used.
Here is the NMR of the final product. Please predict the
structure given the melting point is 163 degrees Celsius.
The analysis of the 1H NMR spectrum should include a detailed
assignment of each of the NMR resonances to the protons...
Nitrogen nucleophiles have different
outcomes in reactions with aldehydes and ketones, after formation
of the tetrahedral intermediate and depending on the type of
nucleophile (1o, 2o or 3o).
Provide the products formed by the
reaction of acetaldehyde and 2-butanone with the following nitrogen
nucleophiles.
a.
b.
c.
d.
,H t, pH 4-5 ,H +, pH4-5 N' II ., pH 4.5 N H O,N NO2 2, 4-dinitrophenylhydrazine
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