Homework Answers
All are examples for Wittig reaction, forms alkenes from carbonyl compounds with phosphorous ylide.
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1. Provide the appropriate Wittig starting materials used to form the following product. Stereochemistry must be...
Wittig Reaction Lab: Provide the appropriate Wittig product(s) formed from the following starting materials [assume the...
Wittig Reaction Lab: Provide the appropriate Wittig product(s) formed from the following starting materials [assume the addition of aqueous sodium hydroxide in order to create the reactive ylide intermediate]. Clearly indicate any chiral centers and E/Z isomerism: a) o-methylbenzaldehyde, triphenylphosphine, and (R)-1-bromo-2,3-dimethylbutane b) (S)-1-chloro-3-ethylhexane, triphenylphosphine, and cyclopentanone
Provide an appropriate alkyne starting material A and intermediate product B. Omit byproducts. The number of carbon ato...
Provide an appropriate alkyne starting material A and
intermediate product B. Omit byproducts. The number of carbon atoms
in the starting material should be the same as in the final
product.
This is all of the information given, so the question is not
incomplete.
Provide an appropriate alkyne starting material A and intermediate product B. Omit byproducts. The number of carbon atoms in the starting material should be the same as in the final product 1) R2BH/THF 2) H202/NaOH/H20
Provide a stepwise synthesis for the following reaction. you may use the indicated starting materials as...
Provide a stepwise synthesis for the following reaction. you may
use the indicated starting materials as well as any organic or
inorganic reagents.
Problem 2. Provide the structures of the starting materials necessary to form the following compounds via...
Problem 2. Provide the structures of the starting materials necessary to form the following compounds via an aldol condensation, Claisen condensation, or Wittig reaction. Use each reaction once, and indicate which reaction you are proposing. For some reactions, there may be multiple correct answers (provide only one).
Provide a multistep synthesis for the desired product using the indicated starting materials. You may use...
Provide a multistep synthesis for the desired product using the indicated starting materials. You may use any additional organic or inorganic reagents. Do not draw any curved-arrow mechanisms. The best answ will require nine or fewer steps. OH 었 OET NH2 Starting Materials NH3 OH Desired Product
Question 2 (a) Show how the Wittig reaction might be used to prepare the following alkene....
Question 2 (a) Show how the Wittig reaction might be used to prepare the following alkene. Mechanisms are not required, however your answer should identify what carbonyl component would be used, and show all steps and reagents required to prepare the necessary phosphorus ylide from the appropriate alkyl halide. You should also justify the resultant stereochemistry observed. HH [6 marks] c) wine celor de (b) What product would you expect from the halohydrin reaction shown below? Provide a mechanism for...
Suggest a synthesis of 1, using as starting materials the Her o CO,Et es -CHO 4....
Suggest a synthesis of 1, using as starting materials the Her o CO,Et es -CHO 4. a) Lily aldehyde (1) is an ingredient used in perfumery. Suggest a synthesis of 1, using as starting materials, the ester 2 and 1-propanol. You may use any other applicable inorganic and/or organic reagents, but LiAIH, NaOH (aq). PCC, H2, DIBAL, and Pd/C are the most likely choices (depending on your synthetic route). No reaction mechanism(s) is required. Lily aldehyde b) Using 2-methyl-1,3-cyclopentanedione, acetaldehyde...
1. Provide the missing starting materials, reagents, or products in each of the following reactions. H+...
1. Provide the missing starting materials, reagents, or products in each of the following reactions. H+ OH CH,OH NaOH Meo NH2 room temp. HO OH Meo Me ОН Meo 2. Provide appropriate conditions to convert each of the following starting mana hexanoic acid (some transformations may require more than one step): It each of the following starting materials into OH OH ОMe "NH₂
Starting Material Reagent Major Product? H2, Pd/C 1) OsO4 2) aq. KHSO: 1) CH3CO3H 2) NaOH/H20...
Starting Material Reagent Major Product? H2, Pd/C 1) OsO4 2) aq. KHSO: 1) CH3CO3H 2) NaOH/H20 Bra/H20 1) O3 2) Zn/HOÁC Provide reagents and/or starting materials to accomplish the following transformations. 40 OH –c=C=CH- CH3 CH3 -оснэ Онон H3C CH3 он any alkene CH₃ CH₂ HC- H.Pd/C optically active diterpene CH mixture of diastereomers 1) O 2) ZHOÁC H3C H3C CH3 + Hн H3c1
Starting Material Reagent Major Product? H2, Pd/C 1) 050 2) aq. KHSO3 1) CH3CO3H 2) NaOH/H20...
Starting Material Reagent Major Product? H2, Pd/C 1) 050 2) aq. KHSO3 1) CH3CO3H 2) NaOH/H20 Braz/H20 1) 0; 2) Zn/HOÁC Provide reagents and/or starting materials to accomplish the following transformations pH ن – EC–CH = ا سے ہی الا) CH3 0CH3 H.C ) م any alkene CH3 H3C- Hy, Pd/C CH3 optically active diterpene mixture of diastereomers 1) 0, 2) Zn/HOÁC нэс CH3 + 0 + 0 + H нас
Provide an appropriate alkyne starting material A and
intermediate product B. Omit byproducts. The number of carbon atoms
in the starting material should be the same as in the final
product.
This is all of the information given, so the question is not
incomplete.
Provide an appropriate alkyne starting material A and intermediate product B. Omit byproducts. The number of carbon atoms in the starting material should be the same as in the final product 1) R2BH/THF 2) H202/NaOH/H20
Provide a stepwise synthesis for the following reaction. you may
use the indicated starting materials as well as any organic or
inorganic reagents.
Problem 2. Provide the structures of the starting materials necessary to form the following compounds via an aldol condensation, Claisen condensation, or Wittig reaction. Use each reaction once, and indicate which reaction you are proposing. For some reactions, there may be multiple correct answers (provide only one).
Provide a multistep synthesis for the desired product using the indicated starting materials. You may use any additional organic or inorganic reagents. Do not draw any curved-arrow mechanisms. The best answ will require nine or fewer steps. OH 었 OET NH2 Starting Materials NH3 OH Desired Product
Question 2 (a) Show how the Wittig reaction might be used to prepare the following alkene. Mechanisms are not required, however your answer should identify what carbonyl component would be used, and show all steps and reagents required to prepare the necessary phosphorus ylide from the appropriate alkyl halide. You should also justify the resultant stereochemistry observed. HH [6 marks] c) wine celor de (b) What product would you expect from the halohydrin reaction shown below? Provide a mechanism for...
Suggest a synthesis of 1, using as starting materials the Her o CO,Et es -CHO 4. a) Lily aldehyde (1) is an ingredient used in perfumery. Suggest a synthesis of 1, using as starting materials, the ester 2 and 1-propanol. You may use any other applicable inorganic and/or organic reagents, but LiAIH, NaOH (aq). PCC, H2, DIBAL, and Pd/C are the most likely choices (depending on your synthetic route). No reaction mechanism(s) is required. Lily aldehyde b) Using 2-methyl-1,3-cyclopentanedione, acetaldehyde...
1. Provide the missing starting materials, reagents, or products in each of the following reactions. H+ OH CH,OH NaOH Meo NH2 room temp. HO OH Meo Me ОН Meo 2. Provide appropriate conditions to convert each of the following starting mana hexanoic acid (some transformations may require more than one step): It each of the following starting materials into OH OH ОMe "NH₂
Starting Material Reagent Major Product? H2, Pd/C 1) OsO4 2) aq. KHSO: 1) CH3CO3H 2) NaOH/H20 Bra/H20 1) O3 2) Zn/HOÁC Provide reagents and/or starting materials to accomplish the following transformations. 40 OH –c=C=CH- CH3 CH3 -оснэ Онон H3C CH3 он any alkene CH₃ CH₂ HC- H.Pd/C optically active diterpene CH mixture of diastereomers 1) O 2) ZHOÁC H3C H3C CH3 + Hн H3c1
Starting Material Reagent Major Product? H2, Pd/C 1) 050 2) aq. KHSO3 1) CH3CO3H 2) NaOH/H20 Braz/H20 1) 0; 2) Zn/HOÁC Provide reagents and/or starting materials to accomplish the following transformations pH ن – EC–CH = ا سے ہی الا) CH3 0CH3 H.C ) م any alkene CH3 H3C- Hy, Pd/C CH3 optically active diterpene mixture of diastereomers 1) 0, 2) Zn/HOÁC нэс CH3 + 0 + 0 + H нас
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