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CHEM301, Fall 2008
Dr. Ruder
1
Class Activity 11
key
Electrophilic Addition
Two molecules combine to form one product.
Model 1: Electrophilic Addition
2 + 2 = 4
(eq 1)
+
Cl
Cl
Cl
Cl
eq 2
(C
6
H
12
)
(C
6
H
12
Cl
2
)
+
H
Cl
Cl
H
eq 3
(C
6
H
12
)
(C
6
H
13
Cl)
Questions
1.
What term is used to describe the mathematical operation shown in eq. 1?
Addition
2.
Describe any changes that occur in the reaction shown in eq. 2.
Compound A has a double bond while compound B has only single bonds. The molecular formula of
A is C6H12, while the formula of B is C6H12Cl2 – thus an addition of two atoms of Cl occurred in the
reaction from A to B.
3.
What term might be used to describe the net reaction illustrated in eq. 2? (compare to eq. 1)
Addition of two molecules has occurred to make one product.
4.
Describe any changes that occur in the reaction shown in eq. 3.
Compound C has a double bond while compound D has only single bonds. The molecular formula of
C is C6H12, while the formula of D is C6H13Cl – thus an addition of two atoms (one H and one Cl)
occurred in the reaction from C to D.
5.
What term might be used to describe the net reaction illustrated in eq. 3? (compare to eq. 1).
Addition of two molecules has occurred to make one product.
6.
As a group come to an agreement on what is similar between the reactions shown in eq. 1, 2, & 3.
Two things have been added together to make one product.
Model 2: Mechanism of Addition Reactions
Two mechanisms are proposed for the addition of reagents to an alkene.
The mechanism shown in
eq. 4 is called stepwise, while the mechanism shown in eq. 5 is called concerted.
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View Full Document CHEM301, Fall 2008
Dr. Ruder
2
+
H
Cl
Cl
H
eq 4
H
+
H
Cl
Cl
H
eq 5
H
Cl
Cl
H
Cl
H
transition state
Concerted
Intermediate
trans. state 1
trans. state 2
Stepwise
Questions
7.
(a).
In the first step of eq. 4, label the Nu and E
Ө
⊕
.
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This note was uploaded on 02/17/2011 for the course CHEM 301 taught by Professor Sahli during the Fall '07 term at VCU.
 Fall '07
 Sahli
 Organic chemistry, Mole, pH

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