The structures for the products formed on reaction of 2,3-dimethyl-1,3-butadiene with each of the given reagents are to be written. Concept introduction: Conjugated dienes are hydrocarbons that two C=C units are joined by a single bond. Electrophilic addition is the reaction that break the π bond and form new σ bond. Catalytic hydrogenation is a stereospecific “syn” addition; both hydrogens add to the same face of the double bond. Mixtures of 1,2- and 1,4- addition products are obtained if a diene reacts with chlorine or bromine. The Diels-Alder reaction is the conjugate addition of an alkene (the dienophile) to a conjugated diene. It is concerted and stereospecific.

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Chapter 11, Problem 34P

Interpretation Introduction

Interpretation:

The structures for the products formed on reaction of 2,3-dimethyl-1,3-butadiene with each of the given reagents are to be written.

Concept introduction:

Conjugated dienes are hydrocarbons that two C=C units are joined by a single bond.

Electrophilic addition is the reaction that break the π bond and form new σ bond.

Catalytic hydrogenation is a stereospecific “syn” addition; both hydrogens add to the same face of the double bond.

Mixtures of 1,2- and 1,4- addition products are obtained if a diene reacts with chlorine or bromine.

The Diels-Alder reaction is the conjugate addition of an alkene (the dienophile) to a conjugated diene. It is concerted and stereospecific.

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