Multiple Carbon–Carbon
and Carbon–Metal
Bond Formation from an Iridium-pybox Complex and Electron-Poor Terminal
Alkynes: Synthesis of Iridium Complexes with a Novel κ<sup>4</sup>N,N,N,C Tetradentate Ligand
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Abstract
The reaction of the complex [Ir(η<sup>2</sup>-C<sub>2</sub>H<sub>4</sub>){κ<sup>3</sup><i>N</i>,<i>N</i>,<i>N</i>-(<i>S</i>,<i>S</i>)-<sup><i>i</i></sup>Pr-pybox)}][PF<sub>6</sub>] (<b>1</b>) with methyl propynoate in acetonitrile yields the new complex <b>2</b> with complete selectivity. In the presence of NaCl, the
reaction of <b>1</b> with propynoate esters in acetonitrile
affords complexes <b>3a</b>,<b>b</b>. The addition of
methanol to complex <b>3a</b> affords complex <b>4</b>, whose structure has been determined by X-ray diffraction analysis