The two pericyclic reactions involved in the two step process, a cycloaddition and a reverse cycloaddition are to be identified. Further how the reactions occur also is to be stated. Concept introduction: In cycloaddition reaction two unsaturated molecules add to one another to yield a cyclic product If even number of electron pair is involved then thermal reaction occur through antarafacial pathway and photochemical reactions occur through suprafacial pathway. If odd number of electron pair is involved then thermal reaction occur through suprafacial pathway and photochemical reactions occur through antarafacial pathway. To identify: The two pericyclic reactions involved in the two step process, a cycloaddition and a reverse cycloaddition and to state how they occur.

Question

B 1 of 2 Additional problems in preparation to Midterm #1: 1.) How can the following compounds be prepared using Diels-Alder reaction: CH3 O CN (a) (b) CN CH3 2.) What is the missing reagent in the shown reaction? H3C + ? H3C H3C CN H3C ''CN (၁) H 3.) Write the products 1,2-addition and 1,4-addition of DBr to 1,3-cyclohexadiene. Remember, D is deuterium, a heavy isotope of hydrogen. It reacts exactly like hydrogen. 4.) In the shown reaction, which will be the kinetic product and which will be the thermodynamic product? H3C CI H3C HCI H3C + 5.) Which of the following molecules is aromatic? (a) (b) (c) H 6.) Which of the following molecules is aromatic? (a) (b) (c) 7.) Write the mechanism for the shown reaction. + Ха AICI 3 CI 8.) Suggest reagents that would convert benzene into the shown compounds. CI NO2 -8-6-6-8-a (a) (b) (c) (d) (e) (a) SO3H Br

Answer 1

Question

Chapter 30.SE, Problem 26AP

Interpretation Introduction

Interpretation:

The two pericyclic reactions involved in the two step process, a cycloaddition and a reverse cycloaddition are to be identified. Further how the reactions occur also is to be stated.

Concept introduction:

In cycloaddition reaction two unsaturated molecules add to one another to yield a cyclic product

If even number of electron pair is involved then thermal reaction occur through antarafacial pathway and photochemical reactions occur through suprafacial pathway.

If odd number of electron pair is involved then thermal reaction occur through suprafacial pathway and photochemical reactions occur through antarafacial pathway.

To identify:

The two pericyclic reactions involved in the two step process, a cycloaddition and a reverse cycloaddition and to state how they occur.

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