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Nickel( II ) Compounds Derived from tripod Ligands: Efficient Catalysts for the Stereoselective Heterodimerization of Styrene and Propene
Author(s) -
Faissner Ralf,
Huttner Gottfried
Publication year - 2003
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200200536
Subject(s) - chemistry , tripod (photography) , propene , catalysis , tetracoordinate , styrene , stereoselectivity , olefin fiber , nickel , stereochemistry , medicinal chemistry , organic chemistry , planar , copolymer , physics , computer graphics (images) , polymer , computer science , optics
The tripod ligands RCH 2 C(CH 2 X)(CH 2 Y)(CH 2 Z) form tetracoordinate compounds with NiHal 2 . If two of the donor functions X, Y, Z are phosphanes, square‐planar coordination is observed. In contrast, donor sets X,Y,Z = P,N,N or N,N,N form tetrahedral compounds, by P , N or N , N coordination, that are active in the catalysis of olefin oligomerization with MAO as a co‐catalyst. These catalyst systems are also active in the stereoselective heterodimerization of olefins. The co‐dimerization of styrene and propene by these systems leads to 4‐phenyl‐2‐pentene almost exclusively, with regioselectivities up to 98% and ( E )/( Z ) ratios of up to 95:5, surpassing other reported catalysts for this process. The products of these catalytic transformations have been fully characterized by GC/MS techniques as well by isolation, NMR and MS characterization of the pure compounds. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)