Homework Answers
Basically for 2nd step , two
type of product is possible through same mechanism. If enolate
react , then structure (l) will form but if carbanion react
structure (ll) will form.
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1) Draw the structure of the enolate formed in the first reaction and then the mechanism...
3) Draw the structure of the enolate formed in the first reaction and then the mechanism...
3) Draw the structure of the enolate formed in the first reaction and then the mechanism of the Claisen reaction in the second reaction. (10 pts) LDA No mechanism in this step Mechanism starts here
2) Draw the structure of the enolate formed in the first reaction and then the mechanism of the Aldol reaction in the s...
2) Draw the structure of the enolate formed in the first reaction and then the mechanism of the Aldol reaction in the second reaction. There is an acid work up step at the very end to neutralize charges only. (10 pts) LDA No mechanism Mechanism starts here in this step
6. (4 pts.) Draw the two resonance structures of the enolate formed from the following reaction: 7. (4 pts) Draw th...
6. (4 pts.) Draw the two resonance structures of the enolate formed from the following reaction: 7. (4 pts) Draw the structure of an alkyl bromide (R-Br) and an alkoxide (R-O) that would provide the most efficient synthesis of the following ether by the Williamson ether synthesis. Target ether 8. (5 pts.) Draw a mechanism for the following E2 reaction. Draw the major product. Be sure to include any necessary H's in your structure as you draw the mechanism. OH...
The following structure represents an intermediate formed by addition of an ester enolate ion to a...
The following structure represents an intermediate formed by addition of an ester enolate ion to a second ester molecule. Draw the reactant. ball & stick Blabels • You do not have to consider stereochemistry, • You do not have to explicitly draw Hatoms. • Do not include lone pairs in your answer. They will not be considered in the grading С P 012 <
4. (2 pts) Consider the enolate forming reaction below. Provide the structure of the enolate anion...
4. (2 pts) Consider the enolate forming reaction below. Provide the structure of the enolate anion formed in this reaction (only need to provide one resonance contributor). HiC o: H2C Нас pKa -20 pKa -33 Enolate oti (2 pts) Based on the information provided, do you expect the favored enolate to be the kinetic or thermodynamic enolate? Briefly explain.
Problem 19.41a Write a detailed mechanism for the following reaction. EtoY OE orbollowed OEt + EtoNa...
Problem 19.41a Write a detailed mechanism for the following reaction. EtoY OE orbollowed OEt + EtoNa Eto OEt OE Get help answering Molecular Drawing questions. X Incorrect. Draw step one of the mechanism which forms the initial carbanion. Draw only the carbanion form of the reaction, NOT the enolate. Include lone pairs and formal charges in the mechanism. Draw out explicitly only the ONE hydrogen that is removed in this mechanistic step. DO NOT USE ABBREVIATIONS SUCH AS OEt for...
1. Draw a mechanism for the following Aldol condensation reaction under basic conditions, including the formation...
1. Draw a mechanism for the following Aldol condensation reaction under basic conditions, including the formation of the enolate. Please include ALL lone pair electrons, formal charges, and stereo/regiochemistry whenever applicable. 1) LDA, H2O 2) LAH 2. Draw a mechanism for the following Dieckmann reaction under basic conditions, including the formation of the enolate. Please include ALL lone pair electrons, formal charges, and stereo/regiochemistry whenever applicable. 1) NaOEt 2) Hзо* OEt 3. Draw a mechanism for the following alkylation reaction...
Draw the major enolate region-isomer expected from each of these carbon acids under the reaction condition...
Draw the major enolate region-isomer expected from each of these carbon acids under the reaction condition indicated in the incomplete equations. Classify each enolate as either kinetic or thermodynamic (16 pts.) LDA. - 78 on .28 KO-t-Bu t-BUOH KO-t-Bu 1-BUOH
Show the mechanism of the reaction shown below (include the structure of the reactive intermediate and...
Show the mechanism of the reaction shown below (include the structure of the reactive intermediate and the addition product formed during the initial addition step): Name the following (use E, Z or cis/trans as needed): d) Draw the structure of Z-2-methoxy-4-methyl-3-hexene
1. A Robinson annulation is a reaction that involves: (i) a Michael addition of an enolate...
1. A Robinson annulation is a reaction that involves: (i) a Michael addition of an enolate onto an ,ß-unsaturated enone followed by (ii) an intramolecular aldol reaction. The molecule shown below (cyclohexenone X) can be made through two different Robinson annulation reactions. (A) Show the two different sets of starting materials (i.e. ketone 1 &a,p-unsaturated enone 1 and ketone 2 & a,B-unsaturated enone 2) for each Robinson annulation. Draw the reagents/reaction conditions. (B) Then pick one set and draw an...
3) Draw the structure of the enolate formed in the first reaction and then the mechanism of the Claisen reaction in the second reaction. (10 pts) LDA No mechanism in this step Mechanism starts here
2) Draw the structure of the enolate formed in the first reaction and then the mechanism of the Aldol reaction in the second reaction. There is an acid work up step at the very end to neutralize charges only. (10 pts) LDA No mechanism Mechanism starts here in this step
6. (4 pts.) Draw the two resonance structures of the enolate formed from the following reaction: 7. (4 pts) Draw the structure of an alkyl bromide (R-Br) and an alkoxide (R-O) that would provide the most efficient synthesis of the following ether by the Williamson ether synthesis. Target ether 8. (5 pts.) Draw a mechanism for the following E2 reaction. Draw the major product. Be sure to include any necessary H's in your structure as you draw the mechanism. OH...
The following structure represents an intermediate formed by addition of an ester enolate ion to a second ester molecule. Draw the reactant. ball & stick Blabels • You do not have to consider stereochemistry, • You do not have to explicitly draw Hatoms. • Do not include lone pairs in your answer. They will not be considered in the grading С P 012 <
4. (2 pts) Consider the enolate forming reaction below. Provide the structure of the enolate anion formed in this reaction (only need to provide one resonance contributor). HiC o: H2C Нас pKa -20 pKa -33 Enolate oti (2 pts) Based on the information provided, do you expect the favored enolate to be the kinetic or thermodynamic enolate? Briefly explain.
Problem 19.41a Write a detailed mechanism for the following reaction. EtoY OE orbollowed OEt + EtoNa Eto OEt OE Get help answering Molecular Drawing questions. X Incorrect. Draw step one of the mechanism which forms the initial carbanion. Draw only the carbanion form of the reaction, NOT the enolate. Include lone pairs and formal charges in the mechanism. Draw out explicitly only the ONE hydrogen that is removed in this mechanistic step. DO NOT USE ABBREVIATIONS SUCH AS OEt for...
1. Draw a mechanism for the following Aldol condensation reaction under basic conditions, including the formation of the enolate. Please include ALL lone pair electrons, formal charges, and stereo/regiochemistry whenever applicable. 1) LDA, H2O 2) LAH 2. Draw a mechanism for the following Dieckmann reaction under basic conditions, including the formation of the enolate. Please include ALL lone pair electrons, formal charges, and stereo/regiochemistry whenever applicable. 1) NaOEt 2) Hзо* OEt 3. Draw a mechanism for the following alkylation reaction...
Draw the major enolate region-isomer expected from each of these carbon acids under the reaction condition indicated in the incomplete equations. Classify each enolate as either kinetic or thermodynamic (16 pts.) LDA. - 78 on .28 KO-t-Bu t-BUOH KO-t-Bu 1-BUOH
Show the mechanism of the reaction shown below (include the structure of the reactive intermediate and the addition product formed during the initial addition step): Name the following (use E, Z or cis/trans as needed): d) Draw the structure of Z-2-methoxy-4-methyl-3-hexene
1. A Robinson annulation is a reaction that involves: (i) a Michael addition of an enolate onto an ,ß-unsaturated enone followed by (ii) an intramolecular aldol reaction. The molecule shown below (cyclohexenone X) can be made through two different Robinson annulation reactions. (A) Show the two different sets of starting materials (i.e. ketone 1 &a,p-unsaturated enone 1 and ketone 2 & a,B-unsaturated enone 2) for each Robinson annulation. Draw the reagents/reaction conditions. (B) Then pick one set and draw an...
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