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Issue 13, 2019
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Calcium formamidinate derivatives by hydride insertion of carbodiimides

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Abstract

The carbodiimides, Ar/RN[double bond, length as m-dash]C[double bond, length as m-dash]NAr/R, (Ar = 2,6-di-isopropylphenyl (Dipp), 4-methylphenyl; R = tert-butyl, cyclohexyl, iso-propyl), react with the polar Ca–H bonds of the dimeric β-diketiminato calcium hydride, [(BDI)CaH]2 (BDI = HC{(Me)CN-2,6-i-Pr2C6H3}2), to provide a series of heteroleptic calcium formamidinate derivatives. While reactions with carbodiimides bearing more sterically demanding substituents (Dipp, t-Bu, Cy) are straightforward, and provide four-coordinate compounds, less bulky iso-propyl or 4-methylphenyl substitution results in the sequestration of a further equivalent of the carbodiimide and the isolation of a heteroleptic hydride-bridged dinuclear species. This latter observation is suggested to be a reflection of the robust dimeric constitution of the calcium hydride reagent and the reduced steric demands of the di-para-tolyl carbodiimide reagent.

Graphical abstract: Calcium formamidinate derivatives by hydride insertion of carbodiimides

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The article was received on 25 Dec 2018, accepted on 26 Feb 2019 and first published on 26 Feb 2019


Article type: Paper
DOI: 10.1039/C8DT05107K
Dalton Trans., 2019,48, 4248-4254
  • Open access: Creative Commons BY-NC license
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    Calcium formamidinate derivatives by hydride insertion of carbodiimides

    J. Dyall, M. S. Hill, M. F. Mahon, L. Teh and A. S. S. Wilson, Dalton Trans., 2019, 48, 4248
    DOI: 10.1039/C8DT05107K

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