In:
Journal of Polymer Science Part A: Polymer Chemistry, Wiley, Vol. 55, No. 18 ( 2017-09-15), p. 3028-3033
Abstract:
Three novel molybdenum imido alkylidene N ‐heterocyclic carbene (NHC) pre‐catalysts, that is, Mo(N‐ t‐ Bu)(1‐(2,6‐diisopropylphenyl)‐3‐isopropyl‐4‐phenyl‐1 H ‐1,2,3‐triazol‐5‐ylidene)(CHCMe 2 Ph)(OTf) 2 ( I1 , OTf = CF 3 SO 3 ), Mo(N‐ t‐ Bu)(1‐(2,6‐diisopropylphenyl)‐3‐isopropyl‐4‐phenyl‐1 H ‐1,2,3‐triazol‐5‐ylidene)(CHCMe 2 Ph)(OTf)( t‐ BuO) ( I2 ) and Mo(N‐2,6‐Me 2 ‐C 6 H 3 )(1,3,4‐triphenyl‐4,5‐dihydro‐1 H ‐1,2,4‐triazol‐5‐ylidene)(CHCMe 2 Ph)(OTf) 2 ( I3 ) are presented. Compared to complexes based on imidazol‐2‐ylidenes or imidazolin‐2‐ylidenes, (1‐(2,6‐diisopropylphenyl)‐3‐isopropyl‐4‐phenyl‐1 H ‐1,2,3‐triazol‐5‐ylidene) used in precatalysts I1 and I2 exerts a comparably strong trans effect to the triflate groups trans to the NHC, while (1,3,4‐triphenyl‐4,5‐dihydro‐1 H ‐1,2,4‐triazol‐5‐ylidene) used in I3 has a weaker trans effect on the triflate. In combination with a suitable second anionic ligand at molybdenum, that is, OTf, t ‐BuO, compounds I1 – I3 require higher temperatures to become active and can thus be used as truly room temperature latent pre‐catalysts, even for a highly reactive monomer such as dicyclopentadiene (DCPD). When used as latent precatalysts, I1 – I3 offer access to poly‐DCPD with different degrees of cross‐linking and glass‐transition temperatures ( T g ). © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 3028–3033
Type of Medium:
Online Resource
ISSN:
0887-624X
,
1099-0518
Language:
English
Publisher:
Wiley
Publication Date:
2017
detail.hit.zdb_id:
3004641-5
detail.hit.zdb_id:
1473076-5
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