Organic Chemistry (8th Edition)
Organic Chemistry (8th Edition)
8th Edition
ISBN: 9780134042282
Author: Paula Yurkanis Bruice
Publisher: PEARSON
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Chapter 28.3, Problem 6P

(a)

Interpretation Introduction

Interpretation: If the reaction is proceeding under thermal conditions then the ring closure of the given compound (2E,4Z,6Z,8E)-2,4,6,8-decatetraene has to be determined.

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

NumberofconjugatedΠbondsReactionconditionsAllowedmodeofrongclosureEvennumberThermalConrotatoryPhotochemicalDisrotatoryOddnumberThermalDisrotatoryPhotochemicalConrotatory

(b)

Interpretation Introduction

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

NumberofconjugatedΠbondsReactionconditionsAllowedmodeofrongclosureEvennumberThermalConrotatoryPhotochemicalDisrotatoryOddnumberThermalDisrotatoryPhotochemicalConrotatory

Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,

SubstituentsinthereactantModeofringclosureConfigurationoftheproductPointinoppositedirectionsDisrotatorycisConrotatorytransPointinthesamedirectionsDisrotatorytransConrotatorycis

(c)

Interpretation Introduction

Interpretation: If the reaction is proceeding under photochemical conditions then the ring closure of the given compound (2E,4Z,6Z,8E)-2,4,6,8-decatetraene should be determined.

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

NumberofconjugatedΠbondsReactionconditionsAllowedmodeofrongclosureEvennumberThermalConrotatoryPhotochemicalDisrotatoryOddnumberThermalDisrotatoryPhotochemicalConrotatory

(d)

Interpretation Introduction

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

NumberofconjugatedΠbondsReactionconditionsAllowedmodeofrongclosureEvennumberThermalConrotatoryPhotochemicalDisrotatoryOddnumberThermalDisrotatoryPhotochemicalConrotatory

Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,

SubstituentsinthereactantModeofringclosureConfigurationoftheproductPointinoppositedirectionsDisrotatorycisConrotatorytransPointinthesamedirectionsDisrotatorytransConrotatorycis

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Students have asked these similar questions
3. Choose the answer that satisfy each statement. a. Under thermal conditions, (2E,4Z)-hexadiene undergoes a ring closure to form b. Under photochemical conditions, (2E,4Z)-hexadiene undergoes a ring closure to form A) conrotatory, cis-3,4-dimethylcyclobutene B) conrotatory, trans-3,4-dimethylcyclobutene C) disrotatory, cis-3,4-dimethylcyclobutene D) disrotatory, trans-3,4-dimethylcyclobutene
Understand the structure and sketch the resultant 2 products and their relationship (stereochemistry) with one another and identify their stereocenters (R/S).
What stereoisomers are obtained from hydroboration–oxidation of the following compounds? Assign an R or S configuration to each asymmetric center. a. cyclohexene b. 1-ethylcyclohexene c. cis-2-butene d. (Z)-3,4-dimethyl-3-hexene
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