A cavity-shaped cis-chelating P,N ligand for highly selective nickel-catalysed ethylene dimerisation†
Yang
Li, 
a
Katrin
Pelzer,
a
Geordie
Creste,
a
Dominique
Matt,
b
Pierre
Braunstein
*a
and
Dominique
Armspach
*a
a
Katrin
Pelzer,
a
Geordie
Creste,
a
Dominique
Matt,
b
Pierre
Braunstein
*a
and
Dominique
Armspach
*a
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).
- This article is part of the themed collection: Dalton turns 50 – celebrating our board members past and present
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