870532-86-8Relevant articles and documents
Activating ATRP Initiators to Incorporate End-Group Modularity into Photo-RAFT Polymerization
Hakobyan, Karen,McErlean, Christopher S. P.,Müllner, Markus
, p. 10357 - 10365 (2020/12/23)
Heterogeneous photocatalysis is increasingly used in reversible deactivation radical polymerization (RDRP). In this study, we found that alkyl bromide redox chemistry typically found in atom transfer radical polymerization (ATRP) can be incorporated in concert with dithiocarbonyl disulfide chemistry into the reversible addition-fragmentation chain transfer (RAFT) process via bismuth oxide photocatalysis. This amalgamation of mechanisms introduces end-group modularity - a new layer of control - into RAFT polymers uniquely enabled by photoredox catalysis. We found that a diversity of functionality can be installed at the α-end group via alkyl bromides, while the molecular weight distribution can be tuned seamlessly at the ω-end group through the simultaneous addition of multiple disulfides.
CO2-Activated Reversible Transition between Polymersomes and Micelles with AIE Fluorescence
Zhang, Dapeng,Fan, Yujiao,Chen, Hui,Trépout, Sylvain,Li, Min-Hui
supporting information, p. 10260 - 10265 (2019/07/03)
Fluorescent polymersomes with both aggregation-induced emission (AIE) and CO2-responsive properties were developed from amphiphilic block copolymer PEG-b-P(DEAEMA-co-TPEMA) in which the hydrophobic block was a copolymer made of tetraphenylethene functionalized methacrylate (TPEMA) and 2-(diethylamino)ethyl methacrylate (DEAEMA) with unspecified sequence arrangement. Four block copolymers with different DEAEMA/TPEMA and hydrophilic/hydrophobic ratios were synthesized, and bright AIE polymersomes were prepared by nanoprecipitation in THF/water and dioxane/water systems. Polymersomes of PEG45-b-P(DEAEMA36-co-TPEMA6) were chosen to study the CO2-responsive property. Upon CO2 bubbling vesicles transformed to small spherical micelles, and upon Ar bubbling micelles returned to vesicles with the presence of a few intermediate morphologies. These polymersomes might have promising applications as sensors, nanoreactors, or controlled release systems.
Facile preparation of bis(thiocarbonyl)disulfides via elimination
Weber, Wolfgang G.,McLeary, James B.,Sanderson, Ron D.
, p. 4771 - 4774 (2007/10/03)
A robust facile synthetic preparation of bis(thiocarbonyl)disulfides is presented. The route follows an elimination mechanism rather than the more common oxidation. Addition of p-tosyl chloride to a thiocarbonyl thiolate results in the elimination of the chloride by the trithiocarbonate anion and subsequent elimination of the tosyl leaving group (by a second thiocarbonyl thiolate). The side products of the reaction are bis(4-methylphenyl)disulfone and tosylate salts/acids.
