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Title
Japanese: 
English:Nickel(0)-Catalyzed Polycondensation of Silafluorene: Control over Molecular Weight and Polymer Growth Mechanism 
Author
Japanese: 田邊真, 岩瀬駿介, 小坂田耕太郎.  
English: Makoto Tanabe, Shunsuke Iwase, KOHTARO OSAKADA.  
Language English 
Journal/Book name
Japanese: 
English:ORGANOMETALLICS 
Volume, Number, Page Vol. 35    No. 15    pp. 2557
Published date June 25, 2016 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://pubs.acs.org/doi/abs/10.1021/acs.organomet.6b00459
 
DOI https://doi.org/10.1021/acs.organomet.6b00459
Abstract The catalytic polymerization of silafluorenes with [Ni(dmpe)2] (dmpe = 1,2-bis(dimethylphosphino)ethane) afforded 2,7-dibutoxy-9H-9-silafluorene polymers with a narrow polydispersity (Mw/Mn < 1.1). In an open vessel, the polymerization ceased shortly after complete consumption of the monomer, but transfer of the reaction mixture into a closed system resumed the polymer growth. Polymerization in a closed system with occasional removal of the evolved H2 furnished soluble polymers with a maximum molecular weight of Mn = 3860. Treatment of a 2,7-dibutoxy-9H-9-silafluorene tetramer with [Ni(dmpe)2] resulted in the initial formation of a mixture of monomers and trimers, which subsequently transformed into oligomers (Si1–Si9). This polymerization involves a preferential dehydrogenative condensation between the monomer and an oligomer relative to that between oligomers, while the presence of H2 regenerates the monomer after its consumption and thus promotes further polymer growth.

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