Cationic tungsten imido alkylidene N-heterocyclic carbene complexes for stereospecific ring-opening metathesis polymerization of norbornene derivatives
Literature Information
Publication Date
2021-09-27
DOI
10.1039/D1PY01158H
Impact Factor
5.582
Authors
Janis V. Musso, Mathis Benedikter, Paul Gebel, Vincent Gramm, Dongren Wang, Roman Schowner
View Original
Abstract
The stereospecific ring-opening metathesis polymerization (ROMP) of endo,exo-2,3-dimethoxymethylnorborn-5-ene (DMMNBE) was accomplished using cationic tungsten imido alkylidene N-heterocyclic carbene (NHC) complexes as initiators. These even outperform a cationic molybdenum imido alkylidene NHC reference initiator and allow for high trans-isospecifity of up to 95%. Furthermore, tuning the steric demand of the ligands of the metal complexes allowed for a change in stereoselectivity. Thus, for the first time, cis-syndiotactic polymers were synthesized by the action of non-chelating cationic group 6 metal alkylidene NHC complexes. Both selectivities were not limited to DMMNBE, but also found for other monomers, namely endo,exo-2,3-dicarbomethoxynorborn-5-ene (DCMNBE), methyl-N-(S)-(−)-α-methylbenzyl-2-azabicyclo[2.2.1]hept-5-ene-3-carboxylate and 2,3-bis[(menthyloxy)carbonyl]norbornadiene.
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Source Journal
Polymer Chemistry
CiteScore:
8.6
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7.3%
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457
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Recommended Compounds
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Oxalic acid compound with cyclohexylsulfamothioic O-acid (11)
CAS Number:
31895-22-4
Molecular Formula:
C7H13NO4S3
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