(a)
Interpretation: The explanation for the conversion of A to B is to be stated.
Concept introduction:
(b)
Interpretation: The two products formed by dienyne metathesis of C are to be drawn.
Concept introduction: Alkene metathesis generally known as olefin metathesis occurs in the presence of Grubbs catalyst. The ring-closing metathesis (RCM) by Grubbs catalyst occurs, when the starting material is diene. This reaction is facilitated under the high-dilution condition as it favors intramolecular metathesis instead of intermolecular metathesis.
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PKG ORGANIC CHEMISTRY
- 5) Draw the enols available to compounds A-D. Explain why A is 100% enolized but B, C, and D are 100% ketone. B Darrow_forward2. (a) Ozonolysis of compound A, CH12 gave two products B and C. Further analysis of these two compounds of B and C, showed positive results with 2,4-dinitrophenylhydrazine. Compound B reacts with Tollens' reagent while compound C does not indicate any positive result to the same reagent. However, both B and C gave same positive results with iodoform test.arrow_forward5.45 Use resonance structures of the possible carbocation intermediates to explain why bromination of biphenyl occurs at the ortho and para positions rather than at the meta positions. Biphenylarrow_forward
- Rank the alkenes shown in the ball-and-stick models (A-C) in order of increasing stability. Barrow_forward(a) Add curved arrows for each step to show how A is converted to the epoxy ketone C. (b) Classify the conversion of A to C as a substitution, elimination, or addition. (c) Draw one additional resonance structure for B.arrow_forwardFor alkenes A, B, C, and D: (a) Rank A—D in order of increasing heat ofhydrogenation; (b) rank A—D in order of increasing rate of reaction withH2, Pd-C; (c) draw the products formed when each alkene is treated withozone, followed by Zn, H2O.arrow_forward
- (a) Label the carbon–carbon double bond in A as E or Z. (b) Draw the products (including stereoisomers) formed when A is treated with H2O in the presence of H2SO4.arrow_forward(a) Are compounds B–D identical to or an isomer of A? (b) Give theIUPAC name for A.arrow_forward13.27 (a) Draw all constitutional isomers formed by monochlorination of each alkane with Cl₂ and hv. (b) Draw the major monobromination product formed by heating each alkane with Br2. A Barrow_forward
- 4.12arrow_forward(a) Why are alkyl halides insoluble in water? (b) Why is Butan-l-ol optically inactive but Butan-2-ol is optically active? (c) Although chlorine is an electron withdrawing group, yet it is ortho-, Para- directing in electrophilic aromatic substitution reaction. Why?arrow_forwardThe cis ketone A is isomerized to a trans ketone B with aqueous NaOH. A similar isomerization does not occur with ketone C. (a) Draw the structure of B using a chair cyclohexane. (b) Label the substituents in C as cis or trans, and explain the difference in reactivity.arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning