Titre :

Catalyzed chain growth polymerisation of ethylene using lanthanidocenes/dialkylmagnesium: further developments and one pot synthesis of narrow dispersed high molecular weight fatty alcohols

Auteur(s) :

Chenal, Thomas [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Drelon, Mathieu [Auteur]
Marsh, B. [Auteur]
Silva, F. F. [Auteur]
Visseaux, Marc [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Mortreux, Andre [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Titre de la revue :

Catalysis Science & Technology

Nom court de la revue :

Catal. Sci. Technol.

Numéro :

20

Pagination :

6809-6824

Date de publication :

2020-10-21

ISSN :

2044-4753

Discipline(s) HAL :

Chimie/Chimie de coordination

Résumé en anglais : [en]

Ethylene polymerisation on dialkylmagnesium using neodymocene based catalysts via catalyzed chain growth (CCG) has been studied with the aim to improve the performance of the overall catalytic/transfer process. A one pot ...
Lire la suite >Ethylene polymerisation on dialkylmagnesium using neodymocene based catalysts via catalyzed chain growth (CCG) has been studied with the aim to improve the performance of the overall catalytic/transfer process. A one pot in situ alkylation procedure has been developed, using commonly available neodymium salts and substituted cyclopentadienes for the catalyst synthesis. This method has been shown to be as efficient as the use of the classical system involving the pre-synthesized well-defined Image ID:d0cy01451f-t1.gif as a precursor. Further experiments conducted on the classical system have also shown that despite their well-known coordination properties, introducing polyethers in the reaction resulted in a tremendous enhancement of the productivity (up to ×800), while keeping the dispersity of the resulting product as low as 1.1. This enhancement is assigned to the result of a much higher dissociation of dialkylmagnesiums, leading first to a strong increase of the exchange rate within the magnesium partners, in conjunction with a dissociative effect on the [Nd–Mg] associated complexes, providing a concomitant concentration increase of the putatively mononuclear Image ID:d0cy01451f-t2.gif species responsible for the propagation step. Application to the synthesis of higher molecular weight fatty alcohols of the UNILIN™ range via direct oxidation by diluted O2 (20% in Ar) of the (polyethylenyl)magnesiums has been performed, giving rise to overall yields of up to 92%, the latter being dependent on the targeted molecular weights.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Équipe(s) de recherche :

Méthodologie organométallique pour la catalyse homogène (MOCAH)

Date de dépôt :

2022-03-02T07:13:26Z
2024-01-15T16:07:28Z