May 28, 2012

CAS databases provide millions of journal article references from more than 10,000 major scientific journals worldwide, patent and patent family references from 63 patent authorities around the world, and other reputable web sources.

The following patent record is from the CAplusSM database.


Patent Number: US 8153810
Title: Alkylidene complexes of ruthenium with N-heterocyclic carbene ligands and their application as highly active, selective catalysts for olefin metathesis
Inventor(s): Herrmann, Wolfgang Anton; Schattenmann, Wolfgang; Weskamp, Thomas
Patent Assignee(s): Aventis Research and Technologies G.m.b.H. and Co. K.-G., Germany; Evonik Degussa G.m.b.H.
Source: Ger. Offen., 12 pp. CODEN: GWXXBX
Language: German

Six title compds. were prepared in 42-89% yields and used as catalysts for polymerization and metathesis of olefins.  E.g., (Ph3P)2Cl2Ru:CHPh and 1,3-diisopropylimidazolin-2-ylidene gave 86% benzylidenedichlorobis(1,3-diisopropylimidazolin-2-ylidene)ruthenium, which, used as catalyst in ring-opening metathesis-polymerization (ROMP) of cyclooctene, gave 97% of product.

Please note:  Titles and abstracts for patent records in CAplus are routinely enhanced to better describe the claimed invention. CAS indexed DE 19815275 as the first published record of the invention which included Aventis Research and Technologies and Evonik Degussa as the patent assignees.


View the full-text U.S. patent from USPTO.

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