Metallaaromaticity involving a d⁰ early transition metal centre: synthesis, structure, and aromaticity of tantallapyridinazirine complexes

Abstract

Though late transition metal aromatic metallabenzenes and related heteroatom-containing analogues have been well studied, the corresponding aromatic early transition metal complexes remain elusive.

Aza-metallacycles with a heptavalent Re (d0) center

“…1). 13 Other conjugated d 0 -metallacycles of early transition metals, such as metallacyclopenta-2,4-dienes of titanium and zirconium, 14 have been extensively studied. In contrast, examples of conjugated late transition metal d 0 -metallacycles are limited.…”