Carbon Dioxide Activation by "Non-nucleophilic" Lead Alkoxides

Tam, Eric C Y, Johnstone, Nick C, Ferro, Lorenzo, Hitchcock, Peter B and Fulton, Robin J (2009) Carbon Dioxide Activation by "Non-nucleophilic" Lead Alkoxides. Inorganic Chemistry, 48 (18). pp. 8971-8976. ISSN 0260-3594

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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.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: Eric Tam
Date Deposited: 06 Feb 2012 19:51
Last Modified: 30 Nov 2012 17:04
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