10 Radicals in Frustrated Lewis Pair Chemistry
371
S
S Ph
Ph
B(C 6 F 5 ) 3
Cp* 2 Fe
+
(C 6 F 5 ) 3 B
S
S
S Ph
Ph
Al(C 6 F 5 ) 3
+
(C 6 F 5 ) 3 Al
S
Al(C 6 F 5 ) 3
[Cp* 2 Fe]
Ph
Ph
(a)
(b)
Te
Te
Ph
Ph
Al(C 6 F 5 ) 3
+
(C 6 F 5 ) 3 Al
Te
Al(C 6 F 5 ) 3
Ph
(c)
17
18
2
2
2 equiv
Cp* 2 Fe
2 equiv
Cp* 2 Fe
2 equiv
2
2
[Cp* 2 Fe]
2
[Cp* 2 Fe]
2
4
4
2
Scheme 10.13 Reactivity of Cp* 2 Fe/E(C 6 F 5 ) 3 (E = B, Al) with diphenyldisulfide and
diphenylditelluride
and [Cp* 2 Fe][HB(C 6 F 5 ) 3 ], the formal product of H-atom abstraction from Ph 3 SnH
by B(C 6 F 5 ) 3
•– (Scheme 10.14a) [41]. However, it must be noted that Ph 3 SnH and
B(C 6 F 5 ) 3 interact in solution to form an Sn–H–B bridged complex [42], which
Cp* 2 Fe
Ph 3 SnH
B(C 6 F 5 ) 3
+
[Cp* 2 Fe] [HB(C 6 F 5 ) 3 ]
+ Ph 3 SnSnPh 3
(a)
+
Cp* 2 Fe
B(C 6 F 5 ) 3
+
[Cp* 2 Fe]
B(C 6 F 5 ) 3
(b)
+
N
O
O
N
2 equiv Cp* 2 Fe
B(C 6 F 5 ) 3
+
2 [Cp* 2 Fe]
(c)
+
O
B(C 6 F 5 ) 3
O
B(C 6 F 5 ) 3
O
O
1 equiv Cp* 2 Fe
B(C 6 F 5 ) 3
+
[Cp* 2 Fe]
(d)
+
O
B(C 6 F 5 ) 3
O
B(C 6 F 5 ) 3
O
O
Scheme 10.14 Reactivity of Cp* 2 Fe/B(C 6 F 5 ) 3 with various radical trapping reagents