%0 Journal Article
%A Probst, Patrick
%A Lindemann, Moritz
%A Bruckner, Johanna R.
%A Atwi, Boshra
%A Wang, Dongren
%A Fischer, Felix R.
%A Högler, Marc
%A Bauer, Matthias
%A Hansen, Niels
%A Dyballa, Michael
%A Buchmeiser, Michael R.
%T Ring-Expansion Metathesis Polymerization under Confinement
%J Journal of the American Chemical Society
%V 147
%N 10
%@ 0002-7863
%C Washington, DC
%I ACS Publications
%M PUBDB-2025-03883
%P 8741 - 8750
%D 2025
%Z ■ ACKNOWLEDGMENTSThe authors acknowledge support by the German Research Foundation (DFG) through grant numbers 358283783�SFB 1333/2 2022 and BU2174/24-1. M.H. and N.H. gratefullyacknowledge the computing time on the high-performance computer HoreKa at the NHR Center at KIT (NHR@KIT).  Waiting for fulltext 
%X The cationic molybdenum alkylidyne N-heterocyclic carbene (NHC) complex [Mo(C-p-OMeC6H4)(OCMe(CF3)2)2 (IMes)][B(ArF4] (IMes = 1,3-dimesitylimidazol-2-ylidene) was selectively immobilized inside the pores of ordered mesoporous silica (OMS) with pore diameters of 66, 56, and 28 Å and used in the ring-expansion metathesis polymerization (REMP) of cyclic olefins to yield cyclic polymers. A strong confinement effect was observed for cis-cyclooctene (cCOE), 1,5-cyclooctadiene (COD), (+)-2,3-endo,exo-dicarbomethoxynorborn-5-ene ((+)-DCMNBE), and 2-methyl-2-phenylcycloprop-1-ene (MPCP), allowing for the synthesis of low-molecular-weight cyclic polymers even at a high monomer concentration. The exclusive formation of cyclic polymers was demonstrated by matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry. Confinement also influences stereoselectivity, resulting in a pronounced increase in Z-selectivity and in an increased cis-syndiospecificity.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1021/jacs.4c18171
%U https://bib-pubdb1.desy.de/record/637657