I  U  P  A  C

News & Notices

Organizations & People

Standing Committees




. . CI
. . PAC
. . Macro. Symp.

. . Books
. . Solubility Data



Links of Interest

Search the Site

Home Page


Pure Appl. Chem. Vol. 73, No. 2, pp. 279-282 (2001)

Pure and Applied Chemistry

Vol. 73, Issue 2

Lewis-acidic organometallic compounds of the lanthanides and the alkaline earth metals as catalysts for the activation of carbonyl groups*

Herbert Schumann**, Mario Glanz, Jochen Gottfriedsen, Sebastian Dechert, and Dietmar Wolff

Technische Universität Berlin, Institut für Anorganische und Analytische Chemie, Sekr. C2, Straße des 17. Juni 135, D-10623 Berlin, Germany

Abstract: 1,3-dialkyl-4,5-dimethylimidazol-2-ylidenes form adducts with various bis (alkylcyclopentadienyl) complexes of magnesium, calcium, strontium, barium, samarium, and ytterbium. The X-ray structures of selected metallocenes and carbene adducts are discussed. Liquid-crystalline homo- and block copolymers with a narrow molecular mass distribution index were obtained in high yields by living polymerization of mesogenic methacrylates with organosamarium complexes. Depending on the structure of the catalyst and the polarity of the solvent used, different, partially competitive reaction mechanisms are observed.

* Lecture presented at the XIXth International Conference on Organometallic Chemistry (XIX ICOMC) , Shanghai, China, 23-28 July 2000. Other presentations are published in this issue, pp. 205-376.
** Corresponding author

Back to Contents for access to full text

Page last modified 7 May 2001.
Copyright © 2001 International Union of Pure and Applied Chemistry.
Questions or comments about IUPAC, please contact, the Secretariat.
Questions regarding the website, please contact web manager.