Calcium formamidinate derivatives by hydride insertion of carbodiimides

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Abstract

The carbodiimides, Ar/RNCNAr/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-Pr 2 C 6 H 3 } 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.

Original languageEnglish
Pages (from-to)4248-4254
Number of pages7
JournalDalton Transactions
Volume48
Issue number13
Early online date26 Feb 2019
DOIs
Publication statusPublished - 7 Apr 2019

ASJC Scopus subject areas

  • Inorganic Chemistry

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