Palladium-Catalyzed Cross-Coupling Polymerization of Bis-<i>N</i>-tosylhydrazones and Bis(silyl) Aryls: A New Access to Polycarbosilane Synthesis

Chen, Chunyu; Yi, Xin; Yang, Ke-Fang; Li, Ze; Lai, Guo-Qiao; Zhang, Pinglu

doi:10.1021/acs.macromol.3c02018

Cited by 1 publication

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“…As one of the most important families of functional polymers, polycarbosilanes containing a C–Si–C bond in the framework have been applied as unique precursors in silicon carbide ceramics and silicon carbide fiber production, − which are prevalently employed in the military industry and astronautics. Since Yajima et al reported the pioneering work of polycarbosilane synthesis by dichlorination-rearrangement in the 1970s, its production in the industry was kept using this method until now, albeit its harsh reaction conditions with a low molecular weight. , Previously, our group had developed a Pd-catalyzed cross-coupling polymerization strategy . However, the issues concerning low molecular weight remain unsolved.…”

Section: Introductionmentioning

confidence: 99%

Cobalt-Catalyzed Hydrosilylation Polymerization for the Synthesis of Linear Polycarbosilanes

Chen,

Luo,

Zeng

et al. 2024

Macromolecules

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Polycarbosilanes are unique precursors in the preparation of silicon carbide ceramics and silicon carbide fibers. The conventional production is carried out upon harsh reaction conditions with a low molecular weight, while the catalytic hydrosilylation polymerization typically relies on noble metal catalysis. We herein report a cobalt-catalyzed hydrosilylation polymerization of dienes and bis-silanes, providing an alternative strategy that enabled the efficient synthesis of linear polycarbosilanes. A broad scope of polycarbosilanes was delivered with up to 25 kDa molecular weight, narrow dispersity, and decent thermal stability. The further functionalization of polycarbosilanes was accessible, while the kinetic process of polymerization was also investigated. Moreover, the introduction of chirality into the polymeric backbone was available, suggesting the application prospects of using polycarbosilanes as chiral organic optoelectronic materials.

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