Abstract
There has been a recent surge of interest in the use of transition metal polypyridyl complexes as visible light-absorbing photocatalysts for synthetic applications. Among the most attractive features of this approach is the availability of many known complexes with well-characterized photophysical and electrochemical properties. In particular, Ru(bpz)32+ is a powerful photooxidant that has proven to be uniquely suited for oxidatively induced photoredox transformations. We present here a straightforward and high-yielding route to Ru(bpz)3(PF6)2 that features an improved Pd-catalyzed synthesis of the 2,2’-bipyrazine ligand that is amenable to gram-scale preparations.
Highlights
The homoleptic tris(bipyrazyl) complex 2 (Ru(bpz)32+) [10] has emerged as one of the most useful transition metal photocatalysts for oxidatively induced organic transformations (Figure 1)
Visible light-photoredox catalysis using transition metal chromophores is rapidly becoming recognized as an important strategy in organic synthesis [1,2,3,4,5]
A variety of Ru and Ir based chromophores spanning a range of redox potentials have recently become widely utilized in the design of new photocatalytic transformations [9]
Summary
The homoleptic tris(bipyrazyl) complex 2 (Ru(bpz)32+) [10] has emerged as one of the most useful transition metal photocatalysts for oxidatively induced organic transformations (Figure 1). Visible light-photoredox catalysis using transition metal chromophores is rapidly becoming recognized as an important strategy in organic synthesis [1,2,3,4,5]. A variety of transition metal complexes bearing bipyrazyl ligands have been prepared and investigated for a wide range of applications in inorganic and organometallic chemistry [20,21,22,23,24,25].
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