Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Hindered Rotation in New Air-Stable Ruthenium Olefin Metathesis Catalysts with Chromanylmethylidene Ligands

Agnieszka Hryniewicka A , Jacek W. Morzycki A D , Leszek Siergiejczyk A , Stanisław Witkowski A D , Jacek Wójcik B and Adam Gryff-Keller C
+ Author Affiliations
- Author Affiliations

A Institute of Chemistry, University of Białystok, al. Piłsudskiego 11/4, 15-443 Białystok, Poland.

B Institute of Biochemistry and Biophysics, Polish Academy of Sciences, ul. Pawińskiego 5a, 02-106 Warsaw, Poland; Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-244 Warsaw, Poland.

C Faculty of Chemistry, Warsaw University of Technology, ul. Noakowskiego 3, 00-664 Warsaw, Poland.

D Corresponding authors. Email: morzycki@uwb.edu.pl; wit@uwb.edu.pl

Australian Journal of Chemistry 62(10) 1363-1370 https://doi.org/10.1071/CH08443
Submitted: 18 October 2008  Accepted: 26 January 2009   Published: 13 October 2009

Abstract

Three new ruthenium complexes with chromanylmethylidene ligands were synthesized and dynamic NMR analysis of these compounds was carried out. The activation energy for the C–Ru rotation was measured for the first time and found to be of ~60 kJ mol–1. The complexes may potentially serve as latent catalysts for olefin metathesis – they promote the simple ring-closing metathesis reactions very slowly at room temperature, but are much more active at slightly elevated temperatures. No asymmetric induction was observed when the chiral α-tocopherol-derived catalyst was used.


Acknowledgement

The present work was supported by the Polish State Committee for Scientific Research (Grants: 3 T09A 013 27 and PBZ-KBN-126/T09/2004).


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