Dipole Moment Question

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jonathanshi_1A
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Dipole Moment Question

Postby jonathanshi_1A » Sun Mar 05, 2017 10:15 pm

In a dipole moment collision between for example, C2Cl4 and Br2 in the course reader, one of the Br becomes slightly positive due to the fact that there is electron repulsion from the nucleophile pi-bond of the carbons in C2Cl4, causing a dipole moment in Br2. However, due to the fact that one Br becomes an electrophile, wouldn't that cause the electrons within Br2 to be more attracted to it, thereby cancelling out the dipole moment? Ultimately, I was wondering if this collision would result in a reaction between the two molecules or not.

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Re: Dipole Moment Question

Postby Chem_Mod » Mon Mar 06, 2017 8:30 am

In a dipole moment collision between for example, C2Cl4 and Br2 in the course reader, one of the Br becomes slightly positive due to the fact that there is electron repulsion from the nucleophile pi-bond of the carbons in C2Cl4, causing a dipole moment in Br2. However, due to the fact that one Br becomes an electrophile, wouldn't that cause the electrons within Br2 to be more attracted to it, thereby cancelling out the dipole moment? Ultimately, I was wondering if this collision would result in a reaction between the two molecules or not

Statistically speaking maybe a small percentage might have that occur but in the grand scheme, the nucleophilic attraction of the double bond is greater than that of the dipole interaction.


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