It's alive: A ring‐strained alkyne based on dibenzo[a,e][8]annulene undergoes ring‐opening metathesis polymerization (ROMP) to give a high‐molecular‐weight poly(ortho‐phenylene) featuring alternating ethyl and ethynyl linkers along the polymer backbone. The molybdenum‐alkylidyne‐based catalyst system discriminates between strained and unstrained alkynes to yield a living polymer with an unparalleled
Highly Selective Molybdenum ONO Pincer Complex Initiates the Living Ring-Opening Metathesis Polymerization of Strained Alkynes with Exceptionally Low Polydispersity Indices
作者:Donatela E. Bellone、Justin Bours、Elisabeth H. Menke、Felix R. Fischer
DOI:10.1021/ja510919v
日期:2015.1.21
pseudo-octahedral molybdenum benzylidyne complex [TolC≡Mo(ONO)(OR)]·KOR (R = CCH3(CF3)2) 1, featuring a stabilizing ONO pincer ligand, initiates the controlled living polymerization of strained dibenzocyclooctynes at T > 60 °C to give high molecular weight polymers with exceptionally low polydispersities (PDI ∼ 1.02). Kinetic analyses reveal that the growing polymer chain attached to the propagating catalyst
COVALENT PRINTING BY PHOTO-TRIGGERED CLICK LIGATION
申请人:Université de Nantes
公开号:EP3798215A1
公开(公告)日:2021-03-31
The present invention relates to the field of covalent printing. More particularly it relates to cyclopropenone derivatives (ink compounds), their use in a covalent printing process and their synthesis process. The invention also relates to a covalent printing process comprising a step of reacting an ink compound according to the invention with a functionalized cellulose sheet comprising -N 3 functional groups. On other aspects the invention also encompasses covalently printed paper sheets.
Two functional atom transfer radical polymerization (ATRP) initiators (I-2 and I-3) were developed bearing a cyclopropenone-masked dibenzocyclooctyne group. ATRP was then explored on three main kinds of monomers for radical polymerization including acrylates, styrenics, and methacrylates based on these novel initiators. By a standard ATRP protocol, the polymerization behavior demonstrated the living characteristics for all three cases and the corresponding well-defined cyclopropenone-masked dibenzocyclooctyne end or middle functionalized polymers were produced conveniently. Since UV irradiation of the cyclopropenone-masked dibenzocyclooctynes could quantitatively release the dibenzocyclooctynes widely used in strain promoted azide-alkyne cycloaddition bioorthogonal click reaction, these novel ATRP initiators and the resultant well-defined polymers should play an important role in the preparation of topological polymers and bio-synthetic polymer conjugates and many other related fields. (C) 2014 Elsevier Ltd. All rights reserved.