Heavier Group‐2‐Element Catalyzed Hydroamination of Carbodiimides
Open Access
- 1 September 2008
- journal article
- research article
- Published by Wiley in European Journal of Inorganic Chemistry
- Vol. 2008 (26), 4173-4179
- https://doi.org/10.1002/ejic.200800613
Abstract
The heteroleptic calcium amide [{ArNC(Me)CHC(Me)NAr}Ca{N(SiMe3)2}(THF)] (Ar = 2,6-diisopropylphenyl) and the homoleptic heavier alkaline earth amides, [M{N(SiMe3)2}2(THF)2] (M = Ca, Sr and Ba) are reported as competent pre-catalysts for the hydroamination of 1,3-carbodiimides. Whilst the reaction scope is currently limited to reactions of aromatic amines with 1,3-dialkylcarbodiimides, in most cases preparations in hydrocarbon solvents proceed rapidly at room temperature with catalyst loadings as low as 0.2 mol-% and the guanidine reaction products crystallize directly from the reaction mixture. Initial studies are consistent with the intermediacy of heavier group-2 guanidinate complexes.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)Keywords
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