Facile Synthesis of Sequence‐Defined Oligo(Dimethylsiloxane‐co‐Diphenylsiloxane)s. Issue 5 (3rd December 2020)

• Record Type: Journal Article
• Authors: Kawatsu, Takahiro; Choi, Jun‐Chul; Sato, Kazuhiko; Matsumoto, Kazuhiro
• Other Names: Brook Michael A. guestEditor.; Skov Anne L. guestEditor.
• Is Part Of: Macromolecular rapid communications. Volume 42:Issue 5(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-12-03
• Subjects: homogeneous catalysis -- oligomerization -- silanes -- silicon -- synthetic method; Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.202000593
• Languages: English
• ISSNs: 1022-1336

Abstract

Abstract: 1, 1, 3, 3, 5, 5, 7, 7‐Octamethyltetrasiloxane ( H MD2 M H ), which is reported to release Me2 SiH2 via a B(C6 F5 )3 ‐catalyzed redistribution, acts as a good Me2 SiH2 precursor in the B(C6 F5 )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(C6 F5 )3 ‐catalyzed dehydrocarbonative condensation of alkoxysilanes with H MD2 M H or Ph2 SiH2 and a B(C6 F5 )3 ‐catalyzed hydrosilylation of carbonyl compounds, followed by the subsequent B(C6 F5 )3 ‐catalyzed dehydrogenative condensation of silanols. Abstract : 1, 1, 3, 3, 5, 5, 7, 7, ‐Octamethyltetrasiloxane ( H MD2 M H ) acts as a good precursor for gaseous Me2 SiH2 in the presence of B(C6 F5 )3 . A one‐pot controlled iteration of a B(C6 F5 )3 ‐catalyzed dehydrocarbonative condensation of alkoxysilanes with Ph2 SiH2 or H MD2 M H and a B(C6 F5 )3 ‐catalyzed hydrosilylation of carbonyl compounds is reported, followed by subsequent end‐capping by a B(C6 F5 )3 ‐catalyzed dehydrogenative condensation with silanols to effectively produce a wide variety of sequence‐defined oligo(dimethylsiloxane‐ co ‐diphenylsiloxane)s.