Effect of immobilization on catalytic characteristics of saturated Pd-N-heterocyclic carbenes in Mizoroki-Heck reactions

Küçük Resim Yok

Tarih

2006

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Elsevier Science Sa

Erişim Hakkı

info:eu-repo/semantics/openAccess

Özet

A saturated Pd-N-heterocyclic complex was immobilized on an amorphous silica. The complex itself is of very high thermal stability. However, TEM observations, hot filtration, reusability, and poisoning tests all revealed that the complex acted only as a precatalyst to highly active Pd species in Mizoroki-Heck reactions when immobilized. The complex appears more stable when used under homogeneous reaction conditions. The immobilized complex afforded high turnover numbers, 10(4)-10(5). The higher turnover frequencies were realized at the lower Pd concentrations, which is a characteristic property of ligand-free Pd catalyzed reactions. (c) 2006 Elsevier B.V. All rights reserved.

Açıklama

Anahtar Kelimeler

Mizoroki-Heck reaction, C-C coupling, heterocyclic carbene, immobilized palladium, heterogeneous catalyst, palladium leaching

Kaynak

Journal of Organometallic Chemistry

WoS Q Değeri

Q2

Scopus Q Değeri

Q3

Cilt

691

Sayı

13

Künye