It should be explained that why compound A will not undergo a ring – opening reaction under thermal conditions, but compound B will. Concept introduction: Conjugated system: A system of connected p-orbitals with delocalized electrons with alternating single and multiple bonds and the compound may be cyclic, linear or mixed 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 pericyclic 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 pericyclic 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

Question

Learning Goal: This question reviews the format for writing an element's written symbol. Recall that written symbols have a particular format. Written symbols use a form like this: 35 Cl 17 In this form the mass number, 35, is a stacked superscript. The atomic number, 17, is a stacked subscript. "CI" is the chemical symbol for the element chlorine. A general way to show this form is: It is also correct to write symbols by leaving off the atomic number, as in the following form: atomic number mass number Symbol 35 Cl or mass number Symbol This is because if you write the element symbol, such as Cl, you know the atomic number is 17 from that symbol. Remember that the atomic number, or number of protons in the nucleus, is what defines the element. Thus, if 17 protons are in the nucleus, the element can only be chlorine. Sometimes you will only see 35 C1, where the atomic number is not written. Watch this video to review the format for written symbols. In the following table each column…

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Question

Chapter 28, Problem 43P

Interpretation Introduction

Interpretation:

It should be explained that why compound A will not undergo a ring – opening reaction under thermal conditions, but compound B will.

Concept introduction:

Conjugated system: A system of connected p-orbitals with delocalized electrons with alternating single and multiple bonds and the compound may be cyclic, linear or mixed

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 pericyclic reactions are listed below

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

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

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

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Learning Goal: This question reviews the format for writing an element's written symbol. Recall that written symbols have a particular format. Written symbols use a form like this: 35 Cl 17 In this form the mass number, 35, is a stacked superscript. The atomic number, 17, is a stacked subscript. "CI" is the chemical symbol for the element chlorine. A general way to show this form is: It is also correct to write symbols by leaving off the atomic number, as in the following form: atomic number mass number Symbol 35 Cl or mass number Symbol This is because if you write the element symbol, such as Cl, you know the atomic number is 17 from that symbol. Remember that the atomic number, or number of protons in the nucleus, is what defines the element. Thus, if 17 protons are in the nucleus, the element can only be chlorine. Sometimes you will only see 35 C1, where the atomic number is not written. Watch this video to review the format for written symbols. In the following table each column…

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