A cavity-shaped cis-chelating P,N ligand for highly selective nickel-catalysed ethylene dimerisation?

Dalton Transactions Pub Date: 2022-07-21 DOI: 10.1039/D2DT01553F

Abstract

The presence of a permethylated α-cyclodextrin (α-CD) cavity in a chelating P,N ligand promotes exclusive formation of 1 : 1 ligand/metal complexes. In MX2 complexes, one of the two halido ligands is forced to reside inside the CD hollow while the second one is pointing outside. Unlike its cavity-free analogue, a Ni(II) complex of the CD ligand is a highly selective precatalyst for ethylene dimerisation (96% C4 selectivity with up to 95% of 1-butene within the C4 fraction).

Graphical abstract: A cavity-shaped cis-chelating P,N ligand for highly selective nickel-catalysed ethylene dimerisation
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