摘要:
A process for preparing polysulfane silanes of formula (I):
(R
1
)
3-m
R
2
m
Si—R
3
—S
x
—R
3
—SiR
2
m
(OR
1
)
3-m
(I),
may include reacting at least one halosilane of formula (II):
(R
1
)
3-m
R
2
m
Si—R
3
-Hal (II),
with M(SH)
y
and/or M
z
S and sulfur, in the presence of a phase transfer catalyst, a base and an aqueous phase, wherein the phase transfer catalyst is an alkylguanidinium catalyst of the formula (III):
and at least two groups of R
4
, R
5
, R
6
, R
7
, and R
8
are —(CH
2
)
2
CH
3
, —CH
2
CH
3
, or —CH
3
.