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Jaeyoung Park, Seongsim Kim, Beomgi Lee, Hyeonsook Cheong, Ji Eun Noh, Hee-Gweon Woo 조선대학교 기초과학연구원 2012 조선자연과학논문집 Vol.5 No.2
Trialkyltin n-Bu3SnH, an endocrine disruptor, was slowly converted by the catalytic action of group 4 Cp2MCl2/Red- Al (M = Ti, Zr, Hf) to produce two phases of products: one is an insoluble cross-linked solid, polystannane in 7-23% yield as minor product via redistribution/dehydrocoupling combination process, and the other is an oil, hexabutyldistannane in 69-90% yield as major product via simple dehydrocoupling process. Redistribution/dehydrocoupling process first produced a low-molecular-weight oligostannane possessing partial backbone Sn-H bonds which then underwent an extensive cross-linking reaction of backbone Sn-H bonds, leading to an insoluble polystannane. This is the first exciting example of redistribution/dehydrocoupling of a tertiary hydrostannane catalyzed by early transition metallocenes.
Beomgi Lee, Seongsim Kim, Jaeyoung Park, Hyeonsook Cheong, Ji Eun Noh, Hee-Gweon Woo 조선대학교 기초과학연구원 2012 조선자연과학논문집 Vol.5 No.2
Polymerization of vinyl monomers is promoted by thianthrene cation radical as a part of our research concerning the reactions of various agents with readily isolable, yet highly reactive species and elucidate the biological activity. Thianthrene cation radical initiated the homopolymerization and copolymerization of styrene and ethyl vinyl ether. The polymerization yields decreased as the concentration of phenylacetylene or diphenylethylene increased. Such polymereization by cationic thianthrene radical could provide some clues for the reaction in living animals. Comments on possible polymerization mechanisms were suggested.
Jaeyoung Park, Seongsim Kim, Beomgi Lee, Hyeonsook Cheong, Ki Bok Lee, Hee-Gweon Woo 조선대학교 기초과학연구원 2013 조선자연과학논문집 Vol.6 No.1
Tributyltin hydride (n-Bu3SnH), an endocrine disruptor, was slowly polymerized by the group 4 Cp’2TiCl2/N-selectride (Cp’ = C5H5, Cp; Me-C5H4, Me-Cp; Me5C5, Cp*) catalyst combination to give two phases of products: one is an insoluble cross-linked solid, polystannane in 3-25% yield as minor product via disproportionation/dehydrocoupling combination process, and the other is an oil, hexabutyldistannane in 65-90% yield as major product via simple dehydrocoupling process. Disproportionation/dehydrocoupling process first produced a low-molecular-weight oligostannane possessing partial backbone Sn-H bonds which then underwent an extensive cross-linking reaction of backbone Sn-H bonds, resulting in the formation of an insoluble polystannane. The disproportionation/dehydrocoupling of a tertiary hydrostannane mediated by early transition metallocene/inorganic hydride is quite unusual and applicable.
Jaeyoung Park, Beomgi Lee, Seongsim Kim, Hyeonsook Cheong, Gyeongja Gwak, Ki Bok Lee, Hee-Gweon Woo 조선대학교 기초과학연구원 2013 조선자연과학논문집 Vol.6 No.2
Bu3Sn-endded poly(vinyl)s with biological activity were obtained by the radical polymerization of vinyl monomers using thianthrene cation radical/nBu3H. Thianthrene cation and stannyl radicals promoted the homopolymerization and copolymerization of styrene and ethyl vinyl ether having number average molecular weights of 2000- 3100. Tributyltin hydride functions as a chain transfer agent. Such polymereization by cationic thianthrene and stannyl radicals could provide some clues for the biological reaction in living animals. Plausible polymerization mechanisms were suggested.
Park, Jaeyoung,Kim, Seongsim,Lee, Beomgi,Cheong, Hyeonsook,Lee, Ki Bok,Woo, Hee-Gweon The Basic Science Institute Chosun University 2013 조선자연과학논문집 Vol.6 No.1
Tributyltin hydride ($n-Bu_3SnH$), an endocrine disruptor, was slowly polymerized by the group 4 ${Cp^{\prime}}_2TiCl_2/N$-selectride (Cp' = $C_5H_5$, Cp; $Me-C_5H_4$, Me-Cp; $Me_5C_5$, $Cp^*$) catalyst combination to give two phases of products: one is an insoluble cross-linked solid, polystannane in 3-25% yield as minor product via disproportionation/dehydrocoupling combination process, and the other is an oil, hexabutyldistannane in 65-90% yield as major product via simple dehydrocoupling process. Disproportionation/dehydrocoupling process first produced a low-molecular-weight oligostannane possessing partial backbone Sn-H bonds which then underwent an extensive cross-linking reaction of backbone Sn-H bonds, resulting in the formation of an insoluble polystannane. The disproportionation/dehydrocoupling of a tertiary hydrostannane mediated by early transition metallocene/inorganic hydride is quite unusual and applicable.