Ir
N
N
BF 4
R
R
N
N
R
R
R = Me (58a), Et (58b), nBu (58c)
Ir
N
N
BF 4
R
R
N
N
R
R
OC
OC
Ir
N
N
X
N
N
R = Me (59a), Et (59b), nBu (59c)
R
R
R =
O
N
N
X =
Br
Br
Br
X =
PF 6
PF 6
60a
60b
60c
60d
60e
Ir
NCMe
NCMe
I
I
N
N
N
N
R = Me (61a), nBu (61b), CH 2 -CH 2 OPh (61c)
BF 4
R
R
O
O
X
N
N
N
N
BF 4
X = I (61d), CF 3 -COO (61e)
Ir
N
N
Cl
R = sBu (62a), iBu (62b), iPr (62c)
MeCN
MeCN
PF 6
64
63
O
R
Ir
Ir
N
N
N
Bu
Cl
MeO
N
N
Me
Bu
N
N
Me
Bu
Ir
X
t
t
Scheme 32 Carbene iridium catalysts (58–64)
104
M. Pilar Lamata et al.