Palladium-Catalyzed Reactions of [Et<sub>3</sub>NH]<sup>+</sup> Salts of [(μ-RS)(μ-CO)Fe<sub>2</sub>(CO)<sub>6</sub>]<sup>−</sup> Anions with Iodo-Aromatic Compounds To Give the Corresponding Butterfly μ-Acyl Fe/S Cluster Complexes
作者:Li-Cheng Song、Hao Tan、An-Guo Zhu、Yuan-Yuan Hu、Hao Chen
DOI:10.1021/acs.organomet.5b00228
日期:2015.5.11
Interestingly, the intermediate salts A [Et3NH] (A = (mu-RS)(mu-CO)Fe-2(CO)(6); R = i-Pr, sec-Bu, cy-C6H11, p-MeC6H4) prepared from Fe-3(CO)(12), RSH, and Et3N were found to react in situ with iodobenzene or its substituted derivatives in the presence of the catalyst precursor Pd(PPh3)(4) to give the benzoyl type mu-acyl complexes (mu-RS)(mu-ArCO)Fe-2(CO)(6) (Ar = phenyl or substituted phenyl), whereas the in situ reactions of A [Et3NH] with iodo-substituted aromatic heterocycles under the same conditions afforded the corresponding heterocyclic type mu-acyl complexes (mu-RS)(mu-ArCO)Fe-2(CO)(6) (Ar = heterocyclic or benzoheterocyclic group). Particularly worth noting is that such Pd-catalyzed C-C bond cross-coupling reactions are the first examples of catalytic reactions regarding A [Et3NH] salts reported so far. In addition, all the prepared new mu-acyl complexes and the three new intermediate salts A [Et3NH] (R = i-Pr, sec-Bu, cy-C6H11) were isolated and structurally characterized, while a possible pathway for such type Pd-catalyzed reactions regarding A [Et3NH] salts is suggested.