Transition-Metal-Mediated Activation of Sulfur toward C–S

Transition-Metal-Mediated Activation of Sulfur toward C–S Bond Formation Jan-Uwe Rohde, Department of Chemistry, The University of Iowa, Iowa City, IA 52242 Monoanionic N,N-dialkyl-N',N''-diarylguanidinates R'' as supporting ligands for reactive, low-valent transition metal centers

R'

N Ir R' R N R' N R

R'

Absorbance

R''

1 0

0 350

1 Time (h)

450

2

550

Wavelength (nm)

& Guanidinato complexes of IrI react with dioxygen and elemental sulfur under mild conditions. & The electronic and steric substituent effects demonstrate the utility of the guanidinato platform in fine-tuning the reactivity of transition metal centers.