Leonor
Maria, 
*ab
Nuno A. G.
Bandeira,
*c
Joaquim
Marçalo,
ab
Isabel C.
Santos
a
and
John K.
Gibson
d
*ab
Nuno A. G.
Bandeira,
*c
Joaquim
Marçalo,
ab
Isabel C.
Santos
a
and
John K.
Gibson
d
Abstract
Uranium(VI) trans-bis(imido) complexes [U(κ4-{(tBu2ArO)2Me2-cyclam})(NPh)(NPhR)] react with CO2 to eliminate phenyl isocyanates and afford uranium(VI) trans-[O![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
UNR]2+ complexes, including [U(κ4-{(tBu2ArO)2Me2-cyclam})(NPh)(O)] that was crystallographically characterized. DFT studies indicate that the reaction proceeds by endergonic formation of a cycloaddition intermediate; the secondary reaction to form a dioxo uranyl complex is both thermodynamically and kinetically hindered.
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