A palladium-catalyzed chelation-assisted C–H olefination of 2-amino biaryls using readily available vinylsilanes as unactivated alkenes was developed to afford valuable arylated vinylsilanes with exclusive (E)-selectivities.
Synthesis of Silylene−Alkylene−Silylene−Vinylene Polymers via Catalytic Silylative Coupling (SC) Polycondensation
作者:Bogdan Marciniec、Ewa Małecka、Marek Ścibiorek
DOI:10.1021/ma0217433
日期:2003.7.1
alpha,omega-Bis(vinyldimethylsilyl)alkanes (1-4) of the general formula CH2 = CH(CH3)(2)Si(CH2)n-(CH3)(2)SiCH =CH2 (where n = 1-4) undergo effective silylative coupling (SC) polycondensation, if catalyzed by [RuCl2(PPh3)(3)] (II) or [RuHCl(CO)(PPh3)(3)] (III), giving linear polymers (5-8) (M,, = 7300-8500) containing a mixture of trans-1,2- and gem-fragments, but in the presence of [RuCl2(CO)(3)}(2)] (1) as a catalyst, highly stereoselective trans-tactic linear polymers are isolated (9-12) (M-w = 6200-9200). The products of both new processes cannot be synthesized via ADMET polymerization or ring-closing metathesis (RCM).
TACKE, R.;LINOH, H.;ATTAR-BASHI, MOAYAD, T.;SHELDRICK, W. S.;ERNST, L.;NI+, Z. NATURFORSCH., 1982, 37, N 11, 1461-1471
作者:TACKE, R.、LINOH, H.、ATTAR-BASHI, MOAYAD, T.、SHELDRICK, W. S.、ERNST, L.、NI+