The utility of the sterically bulky terphenylthiolate ligand, (SAriPr6)1- in expanding uranium reductive chemistry has been explored. Reduction of U(SAriPr6)2I forms the U(II) complex, U(SAriPr6)2, in which the metal is protected by the flanking arene rings of the ligand, but they move out of the way to accommodate the four electron reduction of PhN=NPh to form the U(VI) bis(imido) product U(SAriPr6)2(=NPh)2(THF)2. The KC8 reduction of U(SAriPr6)2 generates a more reduced complex, KU(µ-SAriPr6)2, initially identified by a −2.55 V vs Fc+/Fc electrochemical reduction event in THF.

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