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organic chemistry

Questions and Answers of Organic Chemistry

An aldehyde with molecular formula C4H6O exhibits an IR signal at 1715 cm−1.(a) Propose two possible structures that are consistent with this information.(b) Describe how you could use 13C NMR
How would you distinguish between each pair of compounds using high-resolution mass spectrometry?a.b. Он Но. но
The following are mass spectra for the constitutional isomers ethylcyclohexane and 1, 1-dimethylcyclohexane. Based on likely fragmentation patterns, match the compound with its spectrum. 100 100 80 -
Identify two peaks that are expected to appear in the mass spectrum of 3-pentanol. For each peak, identify the fragment associated with the peak, and show a mechanism for its formation.
Identify the expected base peak in the mass spectrum of 2, 2, 3-trimethylbutane. Draw the fragment associated with this peak, and explain why the base peak results from this fragment.
Consider the structure of anisole (also called methoxybenzene). In the next chapter, we will discuss whether a methoxy group is electron donating or electron withdrawing. We will see that there is a
Predict the major product obtained when each of the following compounds is treated with Birch conditions.a.b.c.d.e.f. OH
Propose a plausible synthesis for the following transformation. Он
Starting with isopropyl benzene, propose a synthesis for acetophenone.
Using toluene as your only source of carbon atoms, show how you would prepare the following compound.
Propose a plausible synthesis for each of the following transformations.a.b.c.d. он
Draw the expected product when each of the following compounds is treated with chromic acid.a.b.c.
Meclizine, shown below, is an antiemetic (prevents nausea and vomiting).a) Would you expect meclizine to be an antihistamine as well? Justify your answer.b) This drug is known to cause sedation.
Identify which compound is expected to have a lower pKa. Justify your choice. N-H H.
Go to the beginning of Section 18.1 where 8 best-selling drugs were shown. Review the structures of those compounds, and identify all of the aromatic rings that are not already highlighted in red.
For each of the following compounds determine which (if any) lone pairs are participating in aromaticity.a.b.c.d.e.f.g.h. :N-H
Identify which of the following compounds is more acidic and explain your choice.
Predict which compound will react more readily in an SN1 process, and explain your choice. Br -Br
Explain the vast difference in pKavalues for the following two apparently similar compounds. pk, = 16 pk, = 36
Determine whether each of following ions is aromatic, nonaromatic, or antiaromatic.a.b.c.d. 0:<
Predict whether the following compound will be aromatic, nonaromatic, or antiaromatic. Explain your reasoning.
Starting with cyclopentanone and using any other reagents of your choosing, identify how you would prepare each of the following compounds:(a)(b)(c)(d) но соон
Predict the major product(s) for each reaction below.(a)(b)(c) 1) LAH 2) Н,о 1) PhMgBr 2) H,0
Treatment of catechol with formaldehyde in the presence of an acid catalyst produces a compound with molecular formula C7H6O2. Draw the structure of this product. HO он Catechol
Devise an efficient synthesis for the following transformation (recall that aldehydes are more reactive than ketones): н H. но
Propose a plausible mechanism for the following transformation: [Н'] н но ELOH
Predict the major product(s) from the treatment of acetone with the following compounds:(a) [H+], NH3, (−H2O)(b) [H+], CH3NH2, (−H2O)(c) [H+], excess EtOH, (−H2O)(d)[H+], (CH3)2NH, (−H2O)(e)
You are working in a laboratory, and you are given the task of converting cyclopentene into 1,5 pentanediol. Your first thought is simply to perform an ozonolysis followed by reduction with LAH, but
Choose a Grignard reagent and a ketone that can be used to produce each of the following compounds:(a) 3-methyl-3-pentanol(b) 1-ethylcyclohexanol(c) Triphenylmethanol(d) 5-phenyl-5-nonanol
Show how a Wittig reaction can be used to prepare each of the following compounds. In each case, also show how the Wittig reagent would be prepared:(a)(b)
Draw the structure of the alkyl halide needed to prepare each of the following Wittig reagents, and then determine which Wittig reagent will be the more difficult to prepare. Explain your choice: Ph
Draw the products of each Wittig reaction below. If two stereoisomers are possible, draw both stereoisomers:(a)(b) Ph Ph Ph-P н Ph Ph. Ph-P Ph, Ph н Ph
For each pair of the following compounds, identify which compound would be expected to react more rapidly with a nucleophile:(a)(b) H.
Explain why the IUPAC name of a compound will never end with the suffix “-1-one.”
Draw all constitutionally isomeric ketones with molecular formula C6H12O, and provide a systematic (IUPAC) name for each isomer.
Draw all constitutionally isomeric aldehydes with molecular formula C5H10O, and provide a systematic (IUPAC) name for each isomer. Which of these isomers possesses a chirality center?
Draw all constitutionally isomeric aldehydes with molecular formula C4H8O, and provide a systematic (IUPAC) name for each isomer.
Draw the structure for each compound below:(a) Propanedial(b) 4-phenylbutanal(c) (S)-3-phenylbutanal(d) 3,3,5,5-tetramethyl-4-heptanone(e) (R)-3-hydroxypentanal(f) Meta-hydroxyacetophenone(g)
Provide a systematic (IUPAC) name for each of the following compounds:(a)(b)(c)(d) H.
Compound A has molecular formula C10H10O and exhibits a strong signal at 1720 cmˆ’1 in its IR spectrum. Treatment with 1,2-ethanedithiol followed by Raney nickel affords the product shown
Using any compounds of your choosing, identify a method for preparing each of the following compounds. Your only limitation is that the compounds you use can have no more than two carbon atoms. For
Propose an efficient synthesis for each of the following transformations:(a)(b)(c)(d)(e)(f)(g) -OH
Predict the major product of each reaction below:(a)(b)(c) RCO3H н RCO, ? H RCO3H
Identify the reagents necessary to accomplish each of the transformations below:(a)(b) Он
Consider the structure of beta-carotene, mentioned earlier in this chapter:Design a synthesis of beta carotene using the compound below as your only source of carbon atoms: B-carotene Br
Identify the reagents necessary to prepare each of the following compounds using a Wittig reaction:(a)(b)(c)(d)(e) -
Identify the reagents necessary to accomplish each of the transformations below:(a)(b) Он Он ОН OH HO NH2
Predict the major product for each reaction below:(a)(b) 1) KCN, HCN 2) LAH -? 3) H20 1) KCN, HCI 2) Hзо, heat
Identify the reagents necessary to accomplish each of the transformations below:(a)(b) Me Он Он ОН Он
Predict the major product of each reaction below:(a)(b)(c) 1) EtMgBr 2) H20 :? H. 1) PhMgBr 2) H20
When 2 moles of benzaldehyde are treated with sodium hydroxide, a reaction occurs in which 1 mole of benzaldehyde is oxidized (giving benzoic acid) while the other mole of benzaldehyde is reduced
Predict the major product for each of the following reactions:(a)(b)(c)(d) 1) LAH 2) H20 н H NABH4, Меон
Draw the structure of the cyclic compound that is produced when acetone is treated with 1,3 propanedithiol in the presence of an acid catalyst. SH 1,3-propanedithiol HS Acetone
Predict the major product for each reaction below:(a)(b) 1) [H'), HS 2) Raney Ni SH 1) [H*), HS' `H. 2) Raney Ni SH
As shown above, methenamine is hydrolyzed in aqueous acid to produce formaldehyde and ammonia. Draw a mechanism showing formation of one molecule of formaldehyde (the remaining five molecules of
Propose a plausible mechanism for the reaction below: [H2SO4] N- -ОН но. Н-N.
Propose a plausible mechanism for each of the following hydrolysis reactions:(a)(b)(c)(d) EtO OEt Нзо* Нэо* + 2 ELOH (b) N. Н Нзо* .N'
Predict the product of the two-step procedure below, and draw a mechanism for its formation: 1) [H1, Н-N-NH2 -H2о 2) КОН / Н-0, heat
Identify the reactants that you would use to make each of the following enamines:(a)(b)(c) -N
Predict the major product for each of the following intramolecular reactions:(a)(b) NH ? [H7 -H20
Predict the major product for each of the following reactions:(a)(b) [H*] N-H -H20 Н :? [н] -H20
Draw a plausible mechanism for each of the following reactions:(a)(b) [H2SO4] Et,NH 'N' -H20 [H2SO4] Me-NH -H20
Identify the reactants that you would use to make each of the following compounds:(a)(b) он NH2
Predict the product of each of the following reactions:(a)(b) [н1] но-NH2 -H20 [H*] H2N-NH2 -H20
Identify the reactants that you would use to make each of the following imines:(a)(b)(c) N.
Identify the reactants that you would use to make each of the following imines:(a)(b)(c) N.
Predict the major product for each of the following intramolecular reactions:(a)(b) ? [H1 NH2 H -H20
Predict the major product for each of the following intramolecular reactions:(a)(b) [H*] -Н2о NH2 Н [H] „NH2 -H20
Predict the major product for each of the following reactions:(a)(b) [H') NH3 -H20 NH2 [H*)-H20
Draw a plausible mechanism for each of the following transformations:(a)(b) [TSOH] MENH2 -H20
Draw a plausible mechanism for each of the following transformations:(a)(b) [TSOH] MENH2 -H20 Et [TSOH] EENH2 -H20
Compound A has molecular formula C8H14O2. Upon treatment with catalytic acid, compound. A is converted into the cyclic hemiacetal. Identify the structure of compound A. Но, Compound A [H*]
Draw a plausible mechanism for the following transformation: Но, [H2SO4] ОН
Predict the product(s) for each reaction below:(a)(b)(c)(d) Нао* OMe Нзо* OMe
Propose an efficient synthesis for each of the following transformations:(a)(b)(c) OH H.
Propose an efficient synthesis for each of the following transformations:(a)(b)(c) OH
Predict the product of each of the following reactions:(a)(b) [H2SO4] excess MeOH -? -H20 но [H,SO4] он -H20
Draw a plausible mechanism for each of the following reactions:(a)(b) HO HO- [H2SO4] -H20
Draw a plausible mechanism for each of the following reactions:(a)(b) Но ОН [H,SO4] -H20 но [H,SO4] он -H20
Draw a plausible mechanism for each of the following transformations:(a)(b)(c)(d) Meo, OMe [H,SO4] excess MeOH -H20
For most ketones, hydrate formation is unfavorable, because the equilibrium favors the ketone rather than the hydrate. However, the equilibrium for hydration of hexafluoroacetone favors formation of
Draw a mechanism for each of the following reactions:(a)(b) HO 1) EtMgBr 2) H20
Draw a mechanism for each of the following reactions:(a)(b) Но 1) EtMgBr 2) Н-о Но I + HCI
Identify the reagents necessary to achieve each of the following transformations:(a)(b)(c)(d)(e)(f) HO ОН H. н
The compound above is an artificial flavor added to microwave popcorn and movietheater popcorn to simulate the butter flavor. Interestingly, this very same compound is also known to contribute to
Provide a systematic (IUPAC) name for the compound below. Be careful: This compound has two chirality centers (can you find them?).
Draw the structure of each of the following compounds:(a) (S)-3,3-dibromo-4-ethylcyclohexanone(b) 2,4-dimethyl-3-pentanone(c) (R)-3-bromobutanal
Assign a systematic (IUPAC) name to each of the following compounds:(a)(b)(c)(d)(e) Н Br Br
When N,N-dimethylaniline is treated with bromine, ortho and para products are observed. Yet, when N,Ndimethylaniline is treated with a mixture of nitric and sulfuric acid, only the meta product is
Propose a plausible mechanism for the following transformation: Но. но. Но H,SO.
Bakelite is one of the first known synthetic polymers and was used to make radio and telephone casings in the early twentieth century. Bakelite is formed by treating phenol with formaldehyde under
Predict the major product of the following reaction. CI- AICI, CI
Each of the following compounds is an aromatic compound bearing a substituent that we did not discuss in this chapter. Using the principles that we discussed in this chapter, predict the major
When toluene is treated with a mixture of excess sulfuric acid and nitric acid at high temperature, a compound is obtained that exhibits only two signals in its 1H NMR spectrum. One signal appears
The 1H NMR spectrum of phenol exhibits three signals in the aromatic region of the spectrum. These signals appear at 6.7, 6.8, and 7.2 ppm. Use your understanding of shielding and deshielding effects
Benzene was treated with (R)-2-chlorobutane in the presence of aluminum trichloride, and the resulting product mixture was found to be optically inactive.(a) What products are expected, assuming that
Starting with benzene and using any other necessary reagents of your choice, design a synthesis for each of the following compounds. Each compound has a Br and one other substituent that we did not
Predict the products for each of the following:a.b.c.d. 1) Hg(OAc), МеОн 2) NABH, 1) Hg(OAc), МeОн 2) NaBH,
Propose a stepwise mechanism for the following transformation. Et Me 1) Excess EtMgBr Me OH 2) H,0 'Et
Compound B has molecular formula C6H10O and does not possess any π bonds. When treated with concentrated HBr, cis-1, 4-dibromocyclohexane is produced. Identify the structure of compound B.

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