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challenge. In addition, novel reactivity may be expected for both known and new acyclic and heterocyclic
systems with potential biradicaloid character. For example, the unusual reactivity of the group 14 alkyne
analogs Ar
M
MAr
Ge, Sn; Ar
=
≡
[M
=
C
6
H
3
-2,6-(C
6
H
3
-2,6-
i
Pr
2
)
2
] in the activation of dihydrogen
under ambient conditions
69
may be related to the singlet biradical character of the M-M bond.
70
The
existence of an accessible, planar diradical of the four-membered Al
2
P
2
ring in the derivative [
t
Bu
2
PA l (
(H
2
)
µ
-
]
2
, indicated by a recent computational study,
71
awaits experimental confirmation. Finally, the
suggestion that the weak transannular S-S bonds in certain sulfur - nitrogen ring systems, for example
S
4
N
4
and 1,5-R
4
P
2
N
4
S
2
,
72
P
t
Bu
2
)
is a potential source of biradicaloid character merits both experimental and
computational investigation.
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