TY  - JOUR
AU  - Probst, Patrick
AU  - Lindemann, Moritz
AU  - Bruckner, Johanna R.
AU  - Atwi, Boshra
AU  - Wang, Dongren
AU  - Fischer, Felix R.
AU  - Högler, Marc
AU  - Bauer, Matthias
AU  - Hansen, Niels
AU  - Dyballa, Michael
AU  - Buchmeiser, Michael R.
TI  - Ring-Expansion Metathesis Polymerization under Confinement
JO  - Journal of the American Chemical Society
VL  - 147
IS  - 10
SN  - 0002-7863
CY  - Washington, DC
PB  - ACS Publications
M1  - PUBDB-2025-03883
SP  - 8741 - 8750
PY  - 2025
N1  - ■ 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 
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1021/jacs.4c18171
UR  - https://bib-pubdb1.desy.de/record/637657
ER  -