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Über die Wirkungsweise löslicher Nickel‐/Aluminium‐Bimetallkatalysatoren auf der Basis von π‐Cyclobutadien‐Nickel‐(II)‐Verbindungen beider Niederdruck‐Oligomerisation von Mono‐Olefinen
Author(s) -
Onsager Olav T.,
Wang Hagbarth,
Blindheim Ulf
Publication year - 1969
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19690520123
Subject(s) - chemistry , nickel , catalysis , bimetallic strip , aluminium , polymer chemistry , medicinal chemistry , organic chemistry
Mixtures of π‐cyclobutadiene‐nickeldihalides and L EWIS acids such as Al(R) n Cl 3‐ n , , n = 1–2, represent very active homogeneous catalysts for dimerization of mono‐olefins. As active cocatalyst may be used L EWIS bases, in particular compounds containing three‐coordinated phosselectivity of the catalytic system has been investigated. The kinetics of the dimerization‐reaction is outlined. The mechanisms of the olefin‐dimerization is best characterized as a «double‐ cis ‐insertionreaction». The main catalytic activity is thought to be connected either to free positively charged nickel cations or to bimetallic nickel‐aluminium‐complexes, depending on theconditions of reaction, in particular the amount and chemical nature of the cocatalyst.