Abstract
1-Silaindenes are prepared starting from (2-vinylphenyl)hydrosilanes
and alkynes through a ruthenium-catalyzed hydrosilylation-ring-closing-metathesis
sequence. The method is successfully applied to the synthesis of
molecules containing multiple silaindene units.
Key words
hydrosilylation - metathesis - ruthenium - homogeneous catalysis - ring closure
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1 Present address: Department of Applied
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9 The regioselectivity of the trans-hydrosilylation was so high that
other isomers were scarcely found in the crude reaction mixtures.
10 Replacement of the dimethylsilylene
(-SiMe2-) moiety of 1a with
diethylsilylene (-SiEt2-) moiety significantly retarded the
hydrosilylation (6%) due to severe steric congestion around
the silicon.