When Si
8
R*
6
(R* = Si(
t
Bu)
3
) is reacted with mild halogenation reagents like carbon tetrachloride, carbon tetrabromide, tin tetrachloride and iodine, new compounds are formed which besides the Si(
t
Bu)
3
groups have halide ligands and a silicon-silicon backbone which is either cyclic, bicyclic or polycyclic. We here report on the molecular and crystal structures of four derivatives: Si
5
R*
3
Cl
5
(
9
), Si
4
R*
3
Br
5
(
10
), Si
8
R*
4
Cl
6
(
11
) and Si
8
R*
3
I
11
(
12
). The molecule
9
has a bicyclic silicon back-bone with a three- and four-membered cycle sharing one edge,
10
is monocyclic with four membered silicon-silicon-ring,
11
is polycyclic and can be derived from a Si
8
-cube and
12
is bicyclic with a four- and five-membered silicon ring sharing one edge. We also propose some possible reaction mechanisms which follow from observations found during our experiments.