(a)
Interpretation: If the reaction is proceeding under thermal conditions then the ring closure of the given compound
Concept introduction:
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Electrocyclic reactions are listed below
(b)
Interpretation: The configuration of product has to be predicted.
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Electrocyclic reactions are listed below
Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,
(c)
Interpretation: If the reaction is proceeding under photochemical conditions then the ring closure of the given compound
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Electrocyclic reactions are listed below
(d)
Interpretation: The configuration of the product has to be predicted.
Concept introduction:
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Electrocyclic reactions are listed below
Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,
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Organic Chemistry (8th Edition)
- The following molecular model of a dimethyl-substituted biphenyl represents the lowest-energy conformation of the molecule. Why are the two benzene rings tilted at a 63� angle to each other rather than being in the same plane so that their p orbitals overlap? Why doesn't complete rotation around the single bond joining the two rings occur?arrow_forwardCompound W shows stereoisomerism. Draw spatial formulae to show this isomerism Describe the physical property which could be used to distinguish between the Isomers.arrow_forwardOptically active (R)-2-bromobutane can be converted to 2-butanol under either conditions A or conditions B. Describe the stereochemistry of the product solutions for the two different conditions.arrow_forward
- a. Draw the structure or structures produced by the catalytic reduction of the given compound, in which H2 is in excess. Draw hydrogen at a chirality center and use wedge-and-dash bonds to designate the stereochemistry, if applicable. b. Select the ways in which the product or products of the reaction may be characterized. • R S ● ● Achiral ● Diastereomers • Racemic ● R, S or S,R or both • S, S ● R,R H₂ Pdarrow_forward10. Which of these describe a set of enantiomers? a. (2R,3R)-2-bromo-3-chloropentane and (2S,3S)-3-bromo-2-chloropentane b. (2R,3R)-2-bromo-3-chlorpentane and (2R,3S)-2-bromo-3-chloropentane c. (2S,3S)-2-bromo-3-chloropentane and (2S,3R)-2-bromo-3-chloropentane d. (2S,3S)-2-bromo-3-chloropentane and (2R,3R)-2-bromo-3-chloropentane e. None of these.arrow_forwardNaN3 НО. NH compound c compound d CI H₂, Pt -85 [References] compound a SOCI₂ SOCI₂ compound d compound e Moclobemide compound b CI The above reaction scheme presents one possible synthesis of the compound. Work out the synthesis on a separate sheet of paper, and then draw the structure of compound e. Consider E/Z stereochemistry of alkenes. • Do not show stereochemistry in other cases. {n [F ? ChemDoodleⓇarrow_forward
- A chemist allows some pure (2S,3R)-3-bromo-2,3-diphenylpentane to react with a solution of sodium ethoxide(NaOCH2 CH3) in ethanol. The products are two alkenes: A (cis-trans mixture) and B, a single pure isomer. Under the same conditions, the reaction of (2S,3S)-3-bromo-2,3-diphenylpentane gives two alkenes, A (cis-trans mixture) and C. Upon catalytic hydrogenation, all three of these alkenes (A, B, and C) give 2,3-diphenylpentane. Determine the structures of A, B, and C; give equations for their formation; and explain the stereospecificity of these reactions.arrow_forwardPredict the major product of this series of reactions. The squiggly bond simply indicates the stereochemistry is unknown, i.e., wedge or dash. HBr compound I 1. NaH 2. compoundI 3. H2, Lindlar 4. Br2, H20 OH Br А. Br C. OH OH Br Br В. D. OH A.arrow_forwardDehydrohalogenation of vinyl halides is essentially an E2 process. A stereochemical study revealed that (Z)-2-chloro-2-butendioic acid reacted 50 times faster than its E stereoisomer. 1. Na+ NH2 HO,C-c=c-co,H 2. H,о For the reaction below: Br 1. Na* NH2 2. H3O* H Ph a Draw the structure of the major organic product.arrow_forward
- Draw the product(s) of the following hydroboration-oxidation reactions. Disregard stereochemistry. CH3 1. B2Н6 Нзс 2. H202(аq), ЗМ NaOH -CHз Нзс Нзс 1. B2Н6 -CHз Нас 2. Н2О2(ад), ЗM NaOH Насarrow_forward6. What happens if butadiene-1,3 is treated with: a) Br2, b) HCl. 7. Write the following sequence of reactions: Na H3C-CI Cl,/UV A KOHalc KMNO4 C В D t°C 20°Carrow_forward10. Draw ALL possible stereoisomers possible for 8i. Give the configurations of each stereocenter in 8i. (NOTE: Ph is the abbreviation for an aromatic ring and is assigned a priority of 4 in the structure for 8i, below) H₂C U CH3 MAIII OH Product 8iarrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning