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organic chemistry

Questions and Answers of Organic Chemistry

Draw the product of the Robinson annulation reaction that occurs when the following compounds are treated with aqueous sodium hydroxide.
The conjugate base of diethyl malonate can serve as a nucleophile to attack a wide range of electrophiles. Identify the product that is formed when the conjugate base of diethyl malonate reacts with
Identify the Michael donor and Michael acceptor that could be used to prepare each of the following compounds via a Michael addition.(a)(b)(c)(d)(e) OEt ČN
Nitriles undergo alkylation at the Î± position much like ketones undergo alkylation at the Î± position.The Î± position of the nitrile is first deprotonated to
The enolate of an ester can be treated with a ketone to give a b-hydroxy ester. Draw a mechanism for this aldol- like reaction. Он 1) LDA Eto Eto 2) 3) H,O*
Beta-keto esters can be prepared by treating the enolate of a ketone with diethyl carbonate. Draw a plausible mechanism for this reaction. OEt 1) LDA 2) Eto OEt 3) Н,о*
The enolate of a ketone can be treated with an ester to give a diketone. Draw a mechanism for this Claisen-like reaction, and explain why an acid source is required after the reaction is complete. 1)
Identify the reagents you would use to convert cyclohexanone into each of the following compounds.(a)(b)(c)(d)(e)(f)(g)
The product of an aldol condensation is an Î±,Î² unsaturated ketone which is capable of undergoing hydrogenation to yield a saturated ketone. Using this technique, identify
Propose an efficient synthesis for each of the following transformations.(a)(b)(c)(d) OEt EtO
Predict the major product for each of the following transformations.(a)(b)
Draw a reasonable mechanism for the following transformation. NaOH, H,0 Heat
Draw the structure of the product that is obtained when acetophenone is treated with each of following reagents:(a) Sodium hydroxide and excess iodine followed by H3O+(b) Bromine in acetic acid(c)
Identify the reagents necessary to achieve each of the following transformations. OEt OEt
Identify the reagents you would use to convert 3-pentanone into 3-hexanone.
Draw the condensation product obtained when the following compound is heated in the presence of aqueous sodium hydroxide. NAOH, H,O Нао C12H120 Нeat
Propose a mechanism for the following transformation. ОН Нао*
Starting with ethyl acetoacetate, and using any other reagents of your choice, show how you would prepare each of the following compounds.(a)(b)(c) ÇOCH3 Ph.
Starting with diethyl malonate, and using any other reagents of your choice, show how you would prepare each of the following compounds.(a)(b)(c) ОН ОН
Draw the condensation product that is expected when each of the following esters is treated with sodium ethoxide followed by acid workup.(a)(b)(c) OEt OEt
Cinnamaldehyde is one of the primary constituents of cinnamon oil and contributes significantly to the odor of cinnamon. Starting with benzaldehyde and using any other necessary reagents, show how
Diethyl malonate (the starting material for the malonic ester synthesis) reacts with bromine in acid-catalyzed conditions to form a product with molecular formula C7H11BrO4.(a) Draw the structure of
When acetaldehyde is treated with aqueous acid, an aldol reaction can occur. In other words, aldol reactions can also occur in acidic conditions, although the intermediate is different than the
Identify the reagents necessary to make each of the following compounds with an aldol condensation.(a)(b)(c)(d) H.
Trimethylacetaldehyde does not undergo an aldol reaction when treated with base. Explain why not.
Draw the product obtained when each of the following compounds is heated in the presence of a base to give an aldol condensation.(a)(b)(c) H.
The isomerization in the previous problem can also occur in basic conditions. Draw a mechanism for the transformation in the presence of catalytic hydroxide.
Propose a mechanism for the following isomerization, and explain the driving force behind this reaction. In other words, explain why the equilibrium favors the product. Он Н,о* ОН
Identify all of the different β-hydroxyaldehydes that are formed when a mixture of benzaldehyde and hexanal is treated with aqueous sodium hydroxide.
Draw all four β-hydroxyaldehydes that are formed when a mixture of acetaldehyde and pentanal is treated with aqueous sodium hydroxide.
The racemization process described in the previous problem also occurs in acidic conditions. Draw a mechanism for the racemization process in aqueous acid.
When optically active (S)-2-methylcyclopentanone is treated with aqueous base, the compoundloses its optical activity. Explain this observation, and draw a mechanism that shows how racemization
When 2-hepten-4-one is treated with LDA, a proton is removed from one of the gamma (γ) positions. Identify which γ position is deprotonated, and explain why the γ proton is the most acidic proton
Draw the enolate that is formed when each of the following compounds is treated with LDA.(a)(b)(c)(d) н
Ethyl acetoacetate has three enol isomers. Draw all three.
Draw the enol of each of the following compounds, and identify whether the enol exhibits a significant presence at equilibrium. Explain.(a)(b)(c)(d)
Rank the following compounds in terms of increasing acidity. ОН
Draw resonance structures for the conjugate base that is produced when each of the following compounds is treated with sodium ethoxide.(a)(b)(c) OEt OEt
One of the compounds from the previous problem has pKa < 10. Identify that compound, and explain why it is so much more acidic than all of the other compounds.
Identify which of the following compounds are expected to have pKa< 20. For each compound with pKa< 20, identify the most acidic proton in the compound. H. ОН
Propose an efficient synthesis for the following transformation. Take special notice of the fact that the starting material has a six-membered ring while the product has a fivemembered ring. н
Propose an efficient synthesis for the following transformation.
Propose an efficient synthesis for each of the following transformations:(a)(b)(c)(d)(e)(f) TH. Он
Using ethanol as your only source of carbon atoms, propose a synthesis for each of the following compounds.(a)(b) OEt .Н но НО он
Using 1-propanol as your only source of carbon, propose an efficient synthesis for each of the following compounds.(a)(b)(c) ОН ОН но но.
Using cyclopentanone as your starting material and using any other reagents of your choice, propose an efficient synthesis for each of the following compounds.(a)(b)(c) OH HO.
Identify the reagents you would use to prepare the following compound via a Robinson annulation. Н. 0=
Draw a complete mechanism for the following transformation. NaOH, heat
Using acetophenone as your only source of carbon atoms, propose a synthesis for the following compound. Acetophenone
Using a Stork enamine synthesis, show how you might accomplish each of the following transformations.(a)(b)(c) H
In the previous section, we learned how to use malonic ester as a starting material in the preparation of substituted carboxylic acids (the malonic ester synthesis). That method employed a step in
Predict the major product of the three following steps and show a mechanism for its formation. 1) КОН 2) 3) Н,о*
Identify the major product formed when each of the following compounds is treated with Et2CuLi followed by mild acid.(a)(b)(c) CN
The product of a Dieckmann cyclization can undergo alkylation, hydrolysis, and decarboxylation. This sequence represents an efficient method for preparing 2-substituted cyclopentanones and
The acetoacetic ester synthesis cannot be used to make 3,3-dimethyl-2-hexanone. Explain why not.
Starting with ethyl acetoacetate and using any other reagents of your choice, propose an efficient synthesis for each of the following compounds.(a)(b)(c) OH
When a malonic ester synthesis is performed using excess base and 1,4-dibromobutane as the alkyl halide, an intramolecular reaction occurs, and the product contains a ring. Draw the product of this
The malonic ester synthesis cannot be used to make 2,2-dimethylhexanoic acid. Explain why not.
Starting with diethyl malonate and using any other reagents of your choice, proposean efficient synthesis for each of the following compounds:(a)(b)(c) но.
Propose an efficient synthesis for each of the following compounds using the malonic ester synthesis.(a)(b)(c)(d)(e) ОН ОН
Identify the reagents you would use to achieve the following transformation: Он ОН
For each of the following reactions, predict the major product and propose a mechanism for its formation.(a)(b)(c) :? 1) LDA 2) CH3I 1) NaH 2) -CH,Br
When the following compound is treated with sodium ethoxide, two condensation products are obtained, both of which are produced via Dieckmann cyclizations. Draw both products. OEt Eto
Predict the product of the Dieckmann cyclization that occurs when each of the following compounds is treated with sodium ethoxide.(a)(b)(c) OEt LOET Eto OEt
Identify the reagents that you would use to produce each of the following compounds using a Claisen condensation.(a)(b)(c)(d)(e) OEt OEt
Predict the major product obtained when each of the following compounds undergoes a Claisen condensation.(a)(b)(c) OEt OMę
Identify the base you would use for each of the following transformations.(a)(b) 1) ? 2) Н,о OEt OEt 1) ? 2) H,o*
When 2,6-heptanedione is heated in the presence of aqueous sodium hydroxide, a condensation product with a six-membered ring is obtained. Draw the product and show a mechanism for its formation.
The reaction in the previous problem is an equilibrium process. Draw a mechanism of the reverse process. That is, draw a mechanism showing conversion of the conjugated, cyclic enone into the acyclic
Draw a mechanism for the following transformation: NaOH, heat
Using formaldehyde and acetaldehyde as your only sources of carbon atoms, show how you could make each of the following compounds. You may find it helpful to review acetal formation.(a)(b)(c)(d) O.
Identify the reagents necessary to produce each of the following compounds via an aldol reaction.(a)(b)(c)(d)(e) он ОН ОН
When 2-butanone is heated in the presence of aqueous sodium hydroxide, two constitutionally isomeric condensation products are obtained. Draw both products.
Identify the starting aldehyde or ketone needed to make each of the following compounds via an aldol condensation.(a)(b)(c) СНО
Draw the condensation product obtained when each of the following compounds is heated in the presence of aqueous sodium hydroxide.(a)(b)(c)(d)(e)(f) H. エ
Using acetaldehyde as your only source of carbon, show how you would prepare 1,3-butanediol.
An alcohol of molecular formula C4H10O was treated with PCC to produce an aldehyde that exhibits exactly three signals in its 1H NMR spectrum. Predict the aldol addition product that is obtained when
When treated with aqueous sodium hydroxide, 2,2-dimethylbutanal does not undergo an aldol addition reaction. Explain this observation.
When each of the following ketones is treated with aqueous sodium hydroxide, the aldol product is obtained in poor yields. In these cases, special distillation techniques are used to increase the
Predict the major product obtained when each of the following aldehydes is treated with aqueous sodium hydroxide:(a)(b)(c)(d) H. H.
Identify the reagents that you would use to accomplish each of the following transformations (you will need to use reactions from previous chapters).(a)(b)(c)(d) ОН OEt CI
Predict the major product obtained when each of the following compounds is treated with bromine (Br2) together with sodium hydroxide (NaOH) followed by aqueous acid (H3O+).(a)(b)(c)
Identify the reagents that you would use to accomplish each of the following transformations (you will also need to use reactions from previous chapters).(a)(b)(c) Br Br OH
Predict the major product for each of the following transformations:(a)
Identify the reagents that you would use to accomplish each of the following transformations:(a)(b) Он но ОН H.
Predict the product(s) of the following reactions:(a)(b)(c)(d) 1) HNO3, H,SO, 2) Zn, HCI Br
Propose a plausible mechanism for the following transformation: NaOMe + Nacl OMe CI
Propose a plausible mechanism for each of the following transformations:(a)(b) I-CI AICI3 CH,Cl, AICI,
Draw a mechanism for each of the following transformations:(a)(b)(c)(d)(e) CI Cl2 AICI3 NO2 HNO, H,SO,
When benzene is treated with 2-methylpropene and sulfuric acid, the product obtained is tert butylbenzene. Propose a mechanism for this transformation.
When the following compound is treated with a mixture of nitric and sulfuric acid at 50°C, nitration occurs to afford a compound with two nitro groups. Draw the structure of this product:
Predict the major product obtained when each of the following compounds is treated with bromine in the presence of iron tribromide.(a) Bromobenzene(b) Nitrobenzene(c) ortho-Xylene(d)
Predict the product(s) obtained when each of the following compounds is treated with chloromethane and aluminum trichloride. Some of the compounds might be unreactive. For those that are reactive,
In Chapter 10, we will see that an acetylide ion (formed by treatment of acetylene with a strong base) can serve as a nucleophile in an SN2 reaction:This reaction provides a useful method for making
Identify the configuration of each chirality center in the following compounds:a.b.c.d.e.f.g.h.i. Et OH Me NH2
For each pair of compounds, identify which compound is more acidic and explain your choice.(a) 2,4-Dimethyl-3,5-heptanedione or 4,4-Dimethyl-3,5-heptanedione(b) 1,2-Cyclopentanedione or
When the following compound is treated with sodium ethoxide, nearly all of it is converted into an enolate. Draw the resonance structures of the enolate that is formed, and explain why enolate
Draw the enolate ion that is formed when each of the following compounds is treated with sodium ethoxide. In each case, draw all resonance structures of the enolate ion, and predict whether a
When 2-methylcyclohexanone is treated with a strong base, two different enolates are formed. Draw both of them.
Draw both resonance structures of the enolate formed when each of the following ketones is treated with a strong base:(a)(b)(c)(d)(e)

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