Chapter 31.SE, Problem 19MP

Interpretation Introduction

a)

Interpretation:

Show the mechanism of the formation of dicyclopentadiene from cyclopentadiene, draw the representative unit of the polymer containing three monomer units and draw the structure of PDCPD.

Concept introduction:

In this process, the addition polymerization takes place. Addition polymerization is also known as chain growth polymerization.

In this process, an initiator is added to the reaction mixture. This initiator gets added to the carbon-carbon double bond and yields a reactive monomer (intermediate). This reactive intermediate reacts with the monomer and this process keeps on repeating to give rise to the final polymeric product.

The formation of PDCPD is taking place by ROMP (ring opening metathesis polymerization), an olefin metathesis reaction can be stated as the reaction between two molecules (alkenes) by exchanging their substituents on their double bonds.

The catalyst used for olefin metathesis polymerization is Grubb’s catalyst (it contain a carbon-metal double bond and have a genral structure as M=CH-R. The function of Grubb’s catalyst is to react reversibly with an alkene to form a four membered cyclic compound knowa as metallacycle. Here, “M” is Ru i.e. ruthenium.

Metallacycle opens up in the next step to give rise to different alkene and a different catalyst.

Interpretation Introduction

b)

Interpretation:

Show the mechanism of the formation of dicyclopentadiene from cyclopentadiene, draw the representative unit of the polymer containing three monomer units and draw the structure of PDCPD.

Concept introduction:

In this process, the addition polymerization takes place. Addition polymerization is also known as chain growth polymerization.

In this process, an initiator is added to the reaction mixture. This initiator gets added to the carbon-carbon double bond and yields a reactive monomer (intermediate). This reactive intermediate reacts with the monomer and this process keeps on repeating to give rise to the final polymeric product.

The formation of PDCPD is taking place by ROMP (ring opening metathesis polymerization), an olefin metathesis reaction can be stated as the reaction between two molecules (alkenes) by exchanging their substituents on their double bonds.

The catalyst used for olefin metathesis polymerization is Grubb’s catalyst (it contain a carbon-metal double bond and have a genral structure as M=CH-R. The function of Grubb’s catalyst is to react reversibly with an alkene to form a four membered cyclic compound knowa as metallacycle. Here, “M” is Ru i.e. ruthenium.

Metallacycle opens up in the next step to give rise to different alkene and a different catalyst.

Interpretation Introduction

c)

Interpretation:

Show the mechanism of the formation of dicyclopentadiene from cyclopentadiene, draw the representative unit of the polymer containing three monomer units and draw the structure of PDCPD.

Concept introduction:

In this process, the addition polymerization takes place. Addition polymerization is also known as chain growth polymerization.

In this process, an initiator is added to the reaction mixture. This initiator gets added to the carbon-carbon double bond and yields a reactive monomer (intermediate). This reactive intermediate reacts with the monomer and this process keeps on repeating to give rise to the final polymeric product.

The formation of PDCPD is taking place by ROMP (ring opening metathesis polymerization), an olefin metathesis reaction can be stated as the reaction between two molecules (alkenes) by exchanging their substituents on their double bonds.

The catalyst used for olefin metathesis polymerization is Grubb’s catalyst (it contain a carbon-metal double bond and have a genral structure as M=CH-R. The function of Grubb’s catalyst is to react reversibly with an alkene to form a four membered cyclic compound knowa as metallacycle. Here, “M” is Ru i.e. ruthenium.

Metallacycle opens up in the next step to give rise to different alkene and a different catalyst.