5 Mechanistic Insight into the Hydrogen Activation by Frustrated Lewis Pairs
181
1 BCF
2 B(p-C6F4CF3)3
3 B(C6F5)2{3,5-(CF3)2C6H3}
4 B(C6F5)2(C6Cl5)
5 B(C6F5)(C6Cl5)2
6 B(C6Cl5)3
7 B(C6F4H)2(C6Cl2H3)
8 B(C6F4H)2(C6Cl3H2)
9 B(C6F3H2)2(C6Cl2H3)
10 B(C6F3H2)2(C6Cl3H2)
11 B(CH(C6F5)2)3
12 B(CF3)3
B
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
B
F
F
F
F
F
F
F
F
CF 3
F 3 C
F
F
F
F
CF 3
B
F
F
F
F
F
F
F
F
F
F
CF 3
F 3 C
B
F
F
F
F
F
F
F
F
Cl
Cl
F
F
Cl
Cl
Cl
B
Cl
Cl
Cl
Cl
F
F
F
F
Cl
Cl
Cl
F
Cl
Cl
Cl
B
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
B
F
F
F
F
F
F
F
F
Cl
Cl
B
F
F
F
F
F
F
F
F
Cl
Cl
Cl
B
F
F
F
F
F
Cl
Cl
F
B
F
F
F
F
F
Cl
Cl
Cl
F
B
HC
F
F
F
F
F
F
F
F
F
F
CH
F
F
F
F
F
F
F
F
F
F
HC
F
F
F
F
F
F
F
F
F
F
B
F 3 C
CF 3
CF 3
Fig. 5.2 Considered Lewis acids (LA). The electronic and structural properties of the BCFderivatives are altered by varying the number of F atoms in the aryl rings or substitution of the
F atoms by bulkier groups. All the BCF-derivatives have a flat geometry in the free molecule Figure
adapted from Ref. [102].