Facile Synthesis of Sequence‐Defined Oligo(Dimethylsiloxane‐co‐Diphenylsiloxane)s

1,1,3,3,5,5,7,7‐Octamethyltetrasiloxane (HMD2MH), which is reported to release Me2SiH2 via a B(C6F5)3‐catalyzed redistribution, acts as a good Me2SiH2 precursor in the B(C6F5)3‐catalyzed dehydrocarbonative condensation of alkoxysilanes. A series of oligo(dimethylsiloxane‐co‐diphenylsiloxane)s that a...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2021-03, Vol.42 (5), p.e2000593-n/a
Main Authors: Kawatsu, Takahiro, Choi, Jun‐Chul, Sato, Kazuhiko, Matsumoto, Kazuhiro
Format: Article
Language:English
Subjects:
Alkoxysilanes
Carbonyl compounds
Carbonyls
Dehydrogenation
homogeneous catalysis
Hydrosilylation
oligomerization
Polydimethylsiloxane
silanes
silicon
synthetic method
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Summary:1,1,3,3,5,5,7,7‐Octamethyltetrasiloxane (HMD2MH), which is reported to release Me2SiH2 via a B(C6F5)3‐catalyzed redistribution, acts as a good Me2SiH2 precursor in the B(C6F5)3‐catalyzed dehydrocarbonative condensation of alkoxysilanes. A series of oligo(dimethylsiloxane‐co‐diphenylsiloxane)s that are uniformly sized and sequence‐defined at the atomic level are synthesized by a one‐pot controlled iteration of a B(C6F5)3‐catalyzed dehydrocarbonative condensation of alkoxysilanes with HMD2MH or Ph2SiH2 and a B(C6F5)3‐catalyzed hydrosilylation of carbonyl compounds, followed by the subsequent B(C6F5)3‐catalyzed dehydrogenative condensation of silanols. 1,1,3,3,5,5,7,7,‐Octamethyltetrasiloxane (HMD2MH) acts as a good precursor for gaseous Me2SiH2 in the presence of B(C6F5)3. A one‐pot controlled iteration of a B(C6F5)3‐catalyzed dehydrocarbonative condensation of alkoxysilanes with Ph2SiH2 or HMD2MH and a B(C6F5)3‐catalyzed hydrosilylation of carbonyl compounds is reported, followed by subsequent end‐capping by a B(C6F5)3‐catalyzed dehydrogenative condensation with silanols to effectively produce a wide variety of sequence‐defined oligo(dimethylsiloxane‐co‐diphenylsiloxane)s.
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.202000593