Interpretation:
The reactions for the synthesis routes for
Concept introduction:
The Lindlar’s catalyst consists of hydrogen in the presence of metal catalyst used to produce
Reduction is a process in which hydrogen atoms are added to a compound.
Usual reagents used in reduction process include
The addition of hydrogen to double or triple bond is a hydrogenation reaction.
Hydrogenation of alkenes or alkynes is an addition reaction, which is done in the presence of reducing agents, such as
The number of hydrogen molecules reacted is equal to the number of double bond present.
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Organic Chemistry
- Using your reaction roadmap as a guide, show how to convert 1-butanol and ethanol into racemic 2-ethoxy-1-butanol. You must use 1-butanol and ethanol as the source of all carbon atoms in the ether product. (1) (2) (3) OH (4) 2-ethoxy-1-butanol (racemic) OH Suggest reagents and experimental conditions for each step in this synthesis. From the choices provided, suggest appropriate reagents for each step. More than one reagent may be necessary. Use the minimum number of steps possible. Enter your answer as a letter, or a series of letters, in the order necessary to bring about the steps shown. Reagents: OH (c) ethylene oxide (a) (CH3)3CO¯K+, THF (d) H₂SO4, H₂O (b) OsO4, H₂O2 Br OH + (9) H₂ SO4 (anhydrous) Na, NH3 (1) (k) NBS, heat (e) m-chloroperoxybenzoic acid (mCPBA) (f) pyridinium chlorochromate) PBr3 (PCC) (h) NaOH (N-bromosuccinimide) Previous Nextarrow_forwardPropose suitable reagents to accomplish the following transformations.arrow_forwardDescribe the characteristic infrared absorption frequencies that would allow you to distinguish between the following pairs of compounds. (a) cyclohex-2-enone and cyclohex-3-enone (b) cyclohexanol and cyclohexanonearrow_forward
- (a) Tsomane and Nyiko were given a task of synthesising methylenecyclohexane 2. After a brief discussion with each other, Tsomane proposed Method A to synthesise 2 from cyclohexanone 1 while Nyiko proposed Method B that started from hydroxymethylcyclohexane 3. Each student believed that their proposed method is better than the other. (Scheme below) (1) 1 Ph THF A Ph Ph B H₂SO4 100 °C 3 OH What is the name of the reaction that is followed by reaction Method A?arrow_forward7.55 Acid-catalyzed dehydration of 2,2-dimethyl-1-hexanol gave a number of isomeric alkenes including 2- methyl-2-heptene as shown in the following equation. H2SO4 НО heat (a) Write a stepwise mechanism for the formation of 2-methyl-2-heptene, using curved arrows to show the flow of electrons. (b) What other alkenes do you think are formed in this reaction?arrow_forward(c) Arrange the following compounds in order of increasing acidity, and explain the reasons for your choice of order: phenol, cyclohexanol, 2-fluorocyclohexanol, 2-fluorophenol.arrow_forward
- 5.34 Select the compound in each of the following pairs that will be converted to the corresponding alkyl bromide more rapidly on being treated with hydrogen bromide. Explain the reason for your choice. (a) 1-Butanol or 2-butanol (b) 2-Methyl-1-butanol or 2-butanol (c) 2-Methyl-2-butanol or 2-butanol (d) 2-Methylbutane or 2-butanol dovolonentanol or cyclohexanolarrow_forward(a) Cyanohydrin formation is useful because of the further chemistry that can be carried out on the product. A nitrile can be reduced to yield a primary amine and also hydrolyzed to yield a carboxylic acid. Thus, cyanohydrin formation provides a method of transforming an aldehyde or ketone into a different functional group. Identify a series of synthetic transformation of the following reaction starting with benzaldehyde: (iii) (v) (i) H. (vi) (iv) (b) Treatment of an aldehyde or ketone with cyanide ion (:C=N), followed by protonation of the tetrahedral alkoxide ion intermediate, gives a cyanohydrin. Show the structure of the cyanohydrin obtained from cyclohexanone, with mechanistic explanation. HCNarrow_forward2. (a) (b) OUTLINE, using suitable mechanisms, how each of the following conversions is achieved. In each case, you should indicate the reagents to be used and show ALL intermediate compounds. Each arrow may represent one or more than one step. CH3CH₂Br (C6H5)3P CHCH3 H CH3 ——-||- H- (C₂H₂)₂N- H H CH,CH,CHO -CHO H₂C CH3 CHCH3arrow_forward
- Draw a structural formula for the alcohol formed by treating each alkene with borane in tetrahydrofuran (THF) followed by hydrogen peroxide in aqueous sodium hydroxide, and specify stereochemistry where appropriate. (a) (d) (b) (e) (c)arrow_forward(a) Propose a mechanism for the conversion of cis-hex-3-ene to the epoxide (3,4-epoxyhexane)and the ring-opening reaction to give the glycol, hexane-3,4-diol. In your mechanism, payparticular attention to the stereochemistry of the intermediates and products.(b) Repeat part (a) for trans-hex-3-ene. Compare the products obtained from cis- andtrans-hex-3-ene. Is this reaction sequence stereospecific?arrow_forwardProvide concise syntheses for each of the following compounds starting from but-1 - ene. The source of all the carbon atoms in these molecules must be either but-1 - ene or any one carbon nucleophile/electrophile. (If you must use a reagent that has more than one carbon atoms you must show the preparation of that reagent from but-1 - ene.) (a) Methyl propanoate (b) 3, 5- Dimethylheptan-4-one (c) 5-ethyl-7-methylnon-4-enearrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage LearningOrganic And Biological ChemistryChemistryISBN:9781305081079Author:STOKER, H. Stephen (howard Stephen)Publisher:Cengage Learning,General, Organic, and Biological ChemistryChemistryISBN:9781285853918Author:H. Stephen StokerPublisher:Cengage Learning