The branched tripodal chloro-methyl-siloxanes of the general formula
t
BuSi[ {OSiMe
2
}
y
OSiMe
3-x
Cl
3
]
3
[x = 0-3; y = 0-2] were synthesized, starting with tert-Butyl-trisilanol (
1
). The treatment of
1
with the chloro-methyl-silanes (Me
3-x
SiCl
x+1
) (x = 0-3) in the presence of triethylamine leads to the compounds
t
BuSi(OSiMe
2
Cl)
3
(
2
),
t
BuSi(OSiMeCl
2
)
3
(
3
) and
t
BuSi(OSiCl
3
)
3
(
4
), The siloxanes
2
–
4
are colourless oily liquids, which can be purified by distillation, Their yields decrease with the number of chloro substituents. In the reaction of compound
2
with three equivalents of water the silantriol
t
BuSi(OSiMe
2
OH)
3
(
5
) is generated which is used to create the branched tripodal chloro-methyl-siloxanes
t
BuSi(OSiMe
2
OSiMe
3
)
3
(
6
),
t
BuSi(OSiMe
2
OSiMe
2
Cl)
3
(
7
),
t
BuSi(OSiMe
2
OSiMeCl
2
)
3
(
9
) and
t
BuSi(OSiMe
2
OSiCl
3
)
3
(
10
). Compound (
7
) is only a side product with a yield of 25 %. The cyclic
t
BuSi[{(OSiMe
2
)
2
Cl}(OSiMe
2
)
3
O] (
8
) can be isolated and characterised. The transformation of the compound
t
BuSi(OSiMe
2
OSiMe
2
Cl)
3
(
7
) into the trisilanol
t
BuSi(OSiMe
2
OSiMe
2
OH)
3
(
11
) allows to prepare the tripodale siloxane
t
BuSi(OSiMe
2
OSiMe
2
OSiMe
3
)
3
(
12
) in good yields. The reaction of
t
BuSi(OSiMe
2
Cl)
3
(
2
) with tert-butyl trisilanol
1
leads to the formation of bicyclic
t
BuSi(OSiMe
2
O)
3
Si
t
Bu (
13
). An X-ray structure determination on
13
reveals a [3.3.3]-bicycle with, a C
3
axis, which crystallizes in the cubic crystal system in the space group
Pa
3̄¯. The reported compounds
2-13
were characterised by NMR- and IR spectroscopy (
5
,
11
) and show correct elemental analyses. The
29
SiNMR-data of the compounds show interesting trends with respect to the Si-O chain length and the chloro substistuents.