A new protocol has been developed for the borylation of conjugated alkenyl methyl ethers using B2Pin2 via C–O bond cleavage catalyzed by Ni(II). In this cross-coupling reaction, both E/Z isomers of alkenyl ethers are converted into (E)-alkenyl boronic esters with good reactivity. This transformation exhibits high chemoselectivity in the presence of competitive C–O bonds such as aryl ether, ester, amide
A new one pot protocol has been developed for the reductive silylation of alkenyl methyl ethers using Et3Si–BPin and HSiEt3 with nickel(II) catalyst. Styrene type methyl ethers, multi-substituted vinyl methyl ethers, heterocycles and unconjugated vinyl ethers are all tolerated to form alkyl silanes. Mechanistic study reveals that it is a cascade of a C–O bond silylation and vinyl double bond hydrogenation
Palladium-catalyzed oxidative difunctionalization of enol ethers with 1,3-dicarbonyl compounds to construct trisubstituted furans in one step under mild conditions is described. The reaction is thought to proceed through a C-C bond formation along with a C-O bond closing the ring structure. Oxygen is the sole oxidant regenerating the Pd(II) catalyst.
COMPATIBILIZER AND BLEND POLYMER COMPOSITION INCLUDING THE SAME
申请人:Hsu Jui-Hsi
公开号:US20120010363A1
公开(公告)日:2012-01-12
A blend polymer composition includes a styrene-based polymer, a non-styrene-based polymer, and a compatibilizer having a block copolymer. The block copolymer includes: a first block including a first monomer unit having an epoxy group, and a second monomer unit selected from an acrylate-based monomer unit, a methacrylate-based monomer unit, and a combination thereof; and a second block including a styrene-based monomer unit. The block copolymer has an epoxy equivalent ranging from 1000 g/eq to 20000 g/eq and a molecular weight distribution index ranging from 1.0 to 2.0.