22963-71-9Relevant articles and documents
Synthesis of poly(vinyl acetate) and poly(vinyl alcohol) containing block copolymers by combination of cobalt-mediated radical polymerization and ATRP
Debuigne, Antoine,Caille, Jean-Raphael,Willet, Nicolas,Jerome, Robert
, p. 9488 - 9496 (2005)
Poly(vinyl acetate) (PVAc) chains of a low polydispersity (M w/Mn ~ 1.1-1.2) have been prepared by cobalt-mediated radical polymerization of vinyl acetate (VAc). They have been end-capped by an activated bromide by addition of an α-bromoester or an a-bromoketone containing nitroxide and converted into effective macroinitiators for the atom transfer radical polymerization of styrene (Sty), ethyl acrylate, and methyl methacrylate. Because each block is formed by a controlled process, well-defined PVAc containing diblock copolymers are easily prepared. The PVAc-b-PS copolymers synthesized from α-bromoketone end-capped PVAc can be converted into well-defined poly(vinyl alcohol)-b-polystyrene amphiphiles by methanolysis of the poly(vinyl acetate) block. Self-association of an amphiphilic poly(vinyl alcohol)(3500)-b-polystyrene(16 600) in a (4/1) water/tetrahydrofuran mixture results in the formation of vesicles as observed by transmission electron microscopy.
Synthesis of novel bicyclic nitroxides using partial favorskii rearrangement
Babi?, Andrej,Pe?ar, Slavko
scheme or table, p. 1155 - 1158 (2009/04/07)
3-Bromo-2,2,6,6-tetramethyl-4-oxopiperidine-1-oxyl was reacted with several C-nucleophiles to give novel bicyclic pyrrolidine nitroxides through partial Favorskii rearrangement. Further reduction with sodium borohydride gave spin probes with free hydroxyl groups and under harsh reduction conditions allowed the Favorskii rearrangement to proceed to completion. Georg Thieme Verlag Stuttgart.
A Study of the Favorskii Rearrangement with 3-Bromo-4-oxo-2,2,6,6-tetramethylpiperidin-1-oxyl
Sosnovsky, George,Cai, Zhen-wei
, p. 3414 - 3418 (2007/10/02)
Favorskii rearrangement reactions of the title compound with sodium hydroxide, sodium ethoxide, ammonia, several aliphatic amines, and ethyl sodiomalonate resulting in pyrrolidine nitroxyl radicals are described.