121065-74-5Relevant articles and documents
Convenient synthesis of thermo-responsive PtBA-g-PPEGMEMA well-defined amphiphilic graft copolymer without polymeric functional group transformation
Song, Xuemei,Zhang, Yaqin,Yang, Dong,Yuan, Li,Hu, Jianhua,Lu, Guolin,Huang, Xiaoyu
, p. 3328 - 3337 (2011)
A series of well-defined amphiphilic graft copolymers bearing hydrophobic poly(tert-butyl acrylate) backbone and hydrophilic poly[poly(ethylene glycol) methyl ether methacrylate)] (PPEGMEMA) side chains were synthesized by sequential reversible addition fragmentation chain transfer (RAFT) polymerization and single-electron-transfer living radical polymerization (SET-LRP) without any polymeric functional group transformation. A new Br-containing acrylate monomer, tert-butyl 2-((2-bromoisobutanoyloxy)methyl) acrylate (tBBIBMA), was first prepared, which can be homopolymerized by RAFT to give a well-defined PtBBIBMA homopolymer with a narrow molecular weight distribution (Mw/Mn = 1.15). This homopolymer with pendant Br initiation group in every repeating unit initiated SET-LRP of PEGMEMA at 45 °C using CuBr/dHbpy as catalytic system to afford well-defined PtBBIBMA-g-PPEGMEMA graft copolymers via the grafting-from strategy. The self-assembly behavior of the obtained graft copolymers in aqueous media was investigated by fluorescence spectroscopy and TEM. These copolymers were found to be stimuli-responsive to both temperature and ions. Finally, poly(acrylic acid)-g-PPEGMEMA double hydrophilic graft copolymers were obtained by selective acidic hydrolysis of hydrophobic PtBA backbone while PPEGMEMA side chains kept inert.
ATNRC and SET-NRC synthesis of PtBA-g-PEO well-defined amphiphilic graft copolymers
Li, Yaogong,Du, Ming,Zhang, Yaqin,Li, Yongjun,Sui, Long,Lu, Guolin,Huang, Xiaoyu
, p. 1890 - 1899 (2012)
A series of new well-defined amphiphilic graft copolymers containing hydrophobic poly(tert-butyl acrylate) backbone and hydrophilic poly(ethylene oxide) side chains were reported. Reversible addition-fragmentation chain transfer homopolymerization of tert-butyl 2-((2-bromopropanoyloxy)methyl) acrylate was first performed to afford a well-defined backbone with a narrow molecular weight distribution (Mw/Mn = 1.07). The target poly(tert-butyl acrylate)-g-poly(ethylene oxide) (PtBA-g-PEO) graft copolymers with low polydispersities (Mw/Mn = 1.18-1.26) were then synthesized by atom transfer nitroxide radical coupling or single electron transfer-nitroxide radical coupling reaction using CuBr(Cu)/PMDETA as catalytic system. Fluorescence probe technique was employed to determine the critical micelle concentrations (cmc) of the obtained amphiphilic graft copolymers in aqueous media. Furthermore, PAA-g-PEO graft copolymers were obtained by selective acidic hydrolysis of hydrophobic PtBA backbone while PEO side chains kept inert.
Convenient synthesis of PtBA-g-PMA well-defined graft copolymer with tunable grafting density
Zhang, Yaqin,Shen, Zhong,Yang, Dong,Feng, Chun,Hu, Jianhua,Lu, Guolin,Huang, Xiaoyu
, p. 117 - 125 (2010)
A series of well-defined graft copolymers, consisting of poly(tert-butyl acrylate) backbone and poly (methyl acrylate) side chains, were synthesized by the combination of reversible addition-fragmentation chain transfer (RAFT) polymerization and atom transfer radical polymerization (ATRP). A new acrylate monomer containing ATRP initiation group, tert-butyl 2-((2-bromopropanoyloxy) methyl)acrylate, was first prepared, which can be homopolymerized or copolymerized with tert-butyl acrylate by RAFT in a controlled way to obtain well-defined homopolymers and copolymers with narrow molecular weight distributions (Mw/Mn w/Mn 1.28) with controllable grafting densities via the grafting-from strategy without any polymeric functional group transformation. Finally, the poly(tert-butyl acrylate) backbone was selectively hydrolyzed in acidic environment without affecting the poly(methyl acrylate) side chains to give poly(acrylic acid)-g-poly(methyl acrylate) amphiphilic graft copolymers
Synthesis of starlike PtBA-g-PEO amphiphilic graft copolymer via highly efficient Cu-catalyzed SET-NRC reaction at ambient temperature
Li, Yaogong,Zhang, Yaqin,Zhai, Sujuan,Deng, Yan,Xiong, Huiming,Lu, Guolin,Huang, Xiaoyu
, p. 23 - 34 (2011)
Two new amphiphilic star graft copolymers bearing hydrophobic poly(tert-butyl acrylate) backbone and hydrophilic poly(ethylene oxide) (PEO) side chains with different molecular weights were synthesized by sequential reversible addition fragmentation chain
Metal-free access to 3-allyl-2-alkoxychromanonesviaphosphine-catalyzed alkoxy allylation of chromones with MBH carbonates and alcohols
Meng, Ling,Chang, Xiaoyong,Lin, Zhenyang,Wang, Jun (Joelle)
supporting information, p. 2663 - 2667 (2021/04/07)
A metal-free access to 3-allyl-2-alkoxychromanones by PPh3-catalyzed alkoxy allylation of chromones with MBH carbonates and alcohols is described. This reaction is performed under mild conditions and it shows good functional group tolerance, providing a series of functionalized chromanones in moderate to high yields with excellent diastereoselectivities. Deuterium-labeling experiments to probe a possible mechanism and scale-up reaction were also conducted.
Phosphine-Catalyzed Cascade Annulation of MBH Carbonates and Diazenes: Synthesis of Hexahydrocyclopenta[c]pyrazole Derivatives
Guo, Hongchao,Li, Hongxiang,Liu, Hao,Shi, Wangyu,Wang, Chang,Wang, Wei,Wu, Yongjun
supporting information, p. 5571 - 5575 (2021/07/31)
A phosphine-catalyzed cascade annulation of Morita-Baylis-Hillman (MBH) carbonates and diazenes was achieved, giving tetrahydropyrazole-fused heterocycles bearing two five-membered rings in moderate to excellent yields. The reaction underwent an unprecedented reaction mode of MBH carbonates, in which two molecules of MBH carbonates were fully merged into the ring system.
Copper-Catalyzed Intermolecular Alkynylation and Allylation of Unactivated C(sp3)-H Bonds via Hydrogen Atom Transfer
Liang, Lei,Guo, Ge,Li, Chen,Wang, Song-Lin,Wang, Yue-Hui,Guo, Hai-Ming,Niu, Hong-Ying
supporting information, p. 8575 - 8579 (2021/11/13)
We describe Cu-catalyzed intermolecular alkynylation and allylation of unactivated C(sp3)-H bonds with singly occupied molecular orbital-philes (SOMO-philes) via hydrogen atom transfer (HAT). Employing N-fluoro-sulfonamide as a HAT reagent, a set of subst
