Scheme 1. Synthesis of [{(py)UIVOUIV(μ-O2C6H4)(py)}(LA)] (A) from [{UVIO2(py)}2(LA)] and 3 equiv. of B2cat2,18 and subsequent synthesis of [{(py)UIV(μ-OH)2UIV(μ-O2C6H4)(py)}(LA)] (1), [{(py)UIV(μ-OMe)(μ-OH)UIV(μ-O2C6H4)(py)}(LA)] (2) and [{(py)UIV(μ-η2:η2-E2)UIV(μ-O2C6H4)(py)}(LA)] (E = S (3), Se (4)); py = pyridine.
