Lithium and aluminium carbamato derivatives of the utility amide 2, 2, 6, 6- tetramethylpiperidide

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Mulvey, R.E. and Kennedy, A.R. and Robertson, Stuart (2010) Lithium and aluminium carbamato derivatives of the utility amide 2, 2, 6, 6- tetramethylpiperidide. Dalton Transactions, 39. pp. 6190-6197. ISSN 1472-7773 (https://doi.org/10.1039/c0dt00118j)

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Abstract

Insertion of CO2 into the metal-N bond of a series of synthetically-important alkali-metal TMP (2,2,6,6-tetramethylpiperidide) complexes has been studied. Determined by X-ray crystallography, the molecular structure of the TMEDA-solvated Li derivative shows a central 8-membered (LiOCO)2 ring lying in a chair conformation with distorted tetrahedral lithium centres. While trying to obtain crystals of a THF solvated derivative, a mixed carbonato/carbamato dodecanuclear lithium cluster was formed containing two central (CO3)2- fragments and eight O2CTMP ligands with four distinct bonding modes. A bisalkylaluminium carbamato complex has also been prepared via two different methods (CO2 insertion into a pre-formed Al-N bond and ligand transfer from the corresponding lithium reagent) which adopts a dimeric structure in the solid state.

ORCID iDs

Mulvey, R.E. ORCID logoORCID: https://orcid.org/0000-0002-1015-2564, Kennedy, A.R. ORCID logoORCID: https://orcid.org/0000-0003-3652-6015 and Robertson, Stuart ORCID logoORCID: https://orcid.org/0000-0002-9330-8770;
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