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Cobalt-bis(imino)pyridine complexes as catalysts for hydroalumination–isomerisation of internal olefins


Weliange, NM and McGuinness, DS and Gardiner, MG and Patel, J, Cobalt-bis(imino)pyridine complexes as catalysts for hydroalumination-isomerisation of internal olefins, Dalton Transactions, 45, (26) pp. 10842-10849. ISSN 1477-9226 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 The Royal Society of Chemistry

DOI: doi:10.1039/c6dt01113f


The insertion of α- and internal octenes (hydroalumination) and chain walking isomerisation at di-n-octylaluminium hydride [Al(Oct)2H], catalysed by bis(imino)pyridine–Co complexes has been investigated by NMR spectroscopy. The Co-based catalysts promote efficient hydroalumination of 1-octene. Internal olefins are partially hydroaluminated, with isomerisation to the primary alkyls, but the catalyst responsible appears to deactivate rapidly. The reaction between the Co precatalysts and [Al(Oct)2H] generates a Co-hydride species, likely to be a hydride bridged dinuclear Co and Al complex. This species is reactive towards α-olefins but inert towards internal olefins. In contrast to hydroalumination, the catalysts promote efficient hydroboration, where insertion and isomerisation of internal octenes goes to completion. The differences between the systems may be partially ascribed to formation of an active mononuclear Co catalyst in the borane system versus a less active Co/Al dinuclear complex in hydroalumination.

Item Details

Item Type:Refereed Article
Keywords:catalysis, olefin oligomerisation
Research Division:Chemical Sciences
Research Group:Inorganic chemistry
Research Field:Transition metal chemistry
Objective Division:Manufacturing
Objective Group:Industrial chemicals and related products
Objective Field:Organic industrial chemicals (excl. resins, rubber and plastics)
UTAS Author:Weliange, NM (Dr Malathi Weliange)
UTAS Author:McGuinness, DS (Dr David McGuinness)
UTAS Author:Gardiner, MG (Associate Professor Michael Gardiner)
ID Code:111137
Year Published:2016
Funding Support:Australian Research Council (DP120101558)
Web of Science® Times Cited:4
Deposited By:Chemistry
Deposited On:2016-08-31
Last Modified:2018-03-14

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