44
X. Feng et al.
Table 2.9 Hydrogenation of diimines
B(C 6 F 5 ) 3
(5-10 mol %)
H 2 (20 bar)
Ar
NAr''
Ar''N
Ar'
Ar
NAr''
Ar''N
Ar'
27
28
Entry product
cat. loading
(mol %)
time
(h)
yield
(%)
1
28a
Ph
NHPh
PhHN
Ph
5
0 . 5
9 4
2
28b
Ph
HN
NH
Ph
F
F
5
0 . 5
9 8
3
28c
Ph
HN
NH
Ph
MeO
OMe
10
4
97
4
28d
Ph
HN
NH
Ph
OMe
OMe
5
2
9 9
5
28e
Ph
HN
NH
Ph
Me Me
5
2
9 5
6
28f
Ph
HN
NH
F
F
t Bu
5
2
9 8
7
28g
Ph
HN
NH
F
F
F
5
2
9 7
8
28h
Ph
HN
NH
F
F
MeO
10
2
99
9
28i
HN
NH
F
F
F
MeO
10
2
92