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Carbon Dioxide Activation by "Non-nucleophilic" Lead Alkoxides

journal contribution
posted on 2023-06-08, 00:14 authored by Eric C Y Tam, Nick C Johnstone, Lorenzo Ferro, Peter B Hitchcock, Robin J Fulton
A series of terminal lead alkoxides have been synthesized utilizing the bulky beta-diketiminate ligand [{N(2,6-(Pr2C6H3)-Pr-i)-C(Me)}(2)CH](-) (BDI). The nucleophilicities of these alkoxides have been examined, and unexpected trends were observed. For instance, (BDI)PbOR reacts with methyl iodide only under forcing conditions yet reacts readily, but reversibly, with carbon dioxide. The degree of reversibility is strongly dependent upon minor changes in the R group. For instance, when R = isopropyl, the reversibility is only observed when the resulting alkyl carbonate is treated with other heterocumulenes; however, when R = tert-butyl, the reversibility is apparent upon any application of reduced pressure to the corresponding alkyl carbonate. The differences in the reversibility of carbon dioxide insertion are attributed to the ground-state energy differences of lead alkoxides. The mechanism of carbon dioxide insertion is discussed.

History

Publication status

  • Published

Journal

Inorganic Chemistry

ISSN

0260-3594

Issue

18

Volume

48

Page range

8971-8976

Pages

6.0

Department affiliated with

  • Chemistry Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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