Toggle Main Menu Toggle Search

Open Access padlockePrints

A Homologous Series of Regioselectively Tetradeprotonated Group 8 Metallocenes: New Inverse Crown Ring Compounds Synthesized via a Mixed Sodium-Magnesium Tris(diisopropylamide) Synergic Base

Lookup NU author(s): Emeritus Professor Bill CleggORCiD, Duncan Tooke


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


Subjecting ferrocene, ruthenocene, or osmocene to the synergic amide base sodium-magnesium tris(diisopropylamido) affords a unique homologous series of metallocene derivatives of general formula [{M(C5H3) 2}Na4Mg4(i-Pr2N)8] (where M = Fe (1), Ru (2), or Os (3)). X-ray crystallographic studies of 1-3 reveal a common molecular "inverse crown" structure comprising a 16-membered [(NaNMgN)4]4+ "host" ring and a metallocenetetraide [M(C5H3)2]4- "guest" core, the cleaved protons of which are lost selectively from the 1, 1′, 3, and 3′-positions. Variable-temperature NMR spectroscopic studies indicate that 1, 2, and 3 each exist as two distinct interconverting conformers in arene solution, the rates of exchange of which have been calculated using coalescence and EXSY NMR measurements.

Publication metadata

Author(s): Andrikopoulos PC, Armstrong DR, Clegg W, Gilfillan CJ, Hevia E, Kennedy AR, Mulvey RE, O'Hara CT, Parkinson JA, Tooke DM

Publication type: Article

Publication status: Published

Journal: Journal of the American Chemical Society

Year: 2004

Volume: 126

Issue: 37

Pages: 11612-11620

Print publication date: 22/09/2004

ISSN (print): 0002-7863

ISSN (electronic): 1520-5126

Publisher: American Chemical Society


DOI: 10.1021/ja0472230


Altmetrics provided by Altmetric