It should be explained that why two different products are formed from disrotatory ring closure of (2E, 4Z, 6Z)-octatriene, but only one product is formed from disrotatory ring closure of (2E, 4Z, 6E)-octatriene. Concept introduction: Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction. There are mainly three types of pericyclic reactions, 1) Electrocyclic reactions 2) Cycloaddition reactions 3) Sigmatropic reactions In an electrocyclic reaction “one new sigma- bond is formed or brocken.” 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 Number of conjugated Π bonds Reaction conditions Allowed mode of ring closure Even number Thermal Conrotatory Photochemical Disrotatory Odd number Thermal Disrotatory Photochemical Conrotatory Woodward – Hoffmann rules for the configuration of electrocyclic reactions are, Substituents in the reactant Mode of ring closure Configuration of the product Point in opposite directions Disrotatory cis Conrotatory trans Point in the same directions Disrotatory trans Conrotatory cis Enantiomers are a type of stereoisomers that have the same molecular formula and constitutions around the atom but differ in their spatial arrangement of groups around the atom.

Question

Differentiate electron spin and electron spin moment.

Answer 1

Question

Chapter 28, Problem 39P

Interpretation Introduction

Interpretation:

It should be explained that why two different products are formed from disrotatory ring closure of (2E, 4Z, 6Z)-octatriene, but only one product is formed from disrotatory ring closure of (2E, 4Z, 6E)-octatriene.

Concept introduction:

Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.

There are mainly three types of pericyclic reactions,

1) Electrocyclic reactions

2) Cycloaddition reactions

3) Sigmatropic reactions

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

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

Number of conjugated Π bondsReaction conditionsAllowed mode of ring closureEven numberThermalConrotatoryPhotochemicalDisrotatoryOdd numberThermalDisrotatoryPhotochemicalConrotatory

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

Substituents in the reactantMode of ring closure Configuration of the productPoint in opposite directionsDisrotatorycisConrotatorytransPoint in the same directionsDisrotatorytransConrotatorycis

Enantiomers are a type of stereoisomers that have the same molecular formula and constitutions around the atom but differ in their spatial arrangement of groups around the atom.

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