February 6, 2012

CAS databases provide millions of journal article references from more than 10,000 major scientific journals worldwide, patent and patent family references from 62 patent authorities around the world, and other reputable web sources.

The following patent record is from the CAplusSM database.


Patent Number: US 8076523
Title: Oligomerization of alkenes in presence of tetramerization and higher-oligomerization catalysts
Inventor(s): Bollmann, Annette; Maumela, Hulisani; Blann, Kevin
Patent Assignee(s): Sasol Technology (Pty) Limited, S. Afr.
Source: PCT Int. Appl., 47 pp. CODEN: PIXXD2
Language: English

Oligomerization of one or more olefins is carried out over 2 or more transition metal catalysts, one a tetramerization catalyst and a higher oligomerization catalyst, both of which contain bulky ligands. The tetramerization catalyst consists of a transition metal compound (preferably a Group IV to VI transition metal complex) and a ligand of general formula (R1)mX1-(Y)-X2(R2)n (X1 and X2 = N, P, As, Sb, Bi, O, S, and Se; Y is a linking group; m,n = 0 or more; R1 and R2 = H, hydrocarbyl, and heterohydrocarbyl). The higher oligomerization catalyst also consists of a transition metal compound and a ligand of general formula (R3)m-A-B-C(R4)m (A and C = N, P, As, Sb, Bi, O, S, and Se; B is a linking group; m,n = 0 or more; and R3 and R4 = H, hydrocarbyl, or heterohydrocarbyl). The catalysts can optionally contain an activator (e.g., an alumoxane).

Please note:  Titles and abstracts are routinely enhanced for patent records in CAplus to better describe the claimed invention. In this example, CAS enhanced both the title and the abstract using additional information found in the patent.

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

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