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Cobalt-bis(imino)pyridine complexes as catalysts for hydroalumination–isomerisation of internal olefins
journal contribution
posted on 2023-05-18, 21:58 authored by Weliange, NM, McGuinness, DS, Michael GardinerMichael Gardiner, Patel, JThe 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.
Funding
Australian Research Council
History
Publication title
Dalton TransactionsVolume
45Issue
26Pagination
10842-10849ISSN
1477-9226Department/School
School of Natural SciencesPublisher
Royal Society of ChemistryPlace of publication
United KingdomRights statement
Copyright 2016 The Royal Society of ChemistryRepository Status
- Restricted