CO2 conversion to isocyanate via multiple N–Si bond cleavage at a bulky uranium(iii) complex†
Abstract
The reaction of the sterically saturated uranium(III) tetrasilylamido complex [K(18c6)][U(N(SiMe3)2)4] with CO2 leads to CO2 insertion into the U–N bond affording the stable U(IV) isocyanate complex [K(18c6)][U(N(SiMe3)2)3(NCO)2]n that was crystallographically characterized. DFT studies indicate that the reaction involves the [2+2] cyclo-addition of a double bond of O![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
CO to the U–N(SiMe3)2 bond and proceeds to the final product through multiple silyl migration steps.
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