Iron Acyl Thiolato Carbonyls: Structural Models for the Active Site of the [Fe]-Hydrogenase (Hmd)
作者:Aaron M. Royer、Marco Salomone-Stagni、Thomas B. Rauchfuss、Wolfram Meyer-Klaucke
DOI:10.1021/ja1072228
日期:2010.12.1
indicate that substitution is stereospecific and cis to P. The IR spectrum of [2](-) in ν(CN) and ν(CO) regions very closely matches that for Hmd(CN). XANES and EXAFS measurements also indicate close structural and electronic similarity of Et(4)N[2] to the active site of wild-type Hmd. Complex 1 also stereospecifically forms a derivative with TsCH(2)NC, but the adduct is more labile than Et(4)N[2].
膦修饰的硫酯衍生物被证明可作为膦稳定的亚铁酰基硫醇羰基的有效前体,其复制了氢化酶 Hmd 活性位点的关键结构特征。Ph(2)PC(6)H(4)C(O)SPh 和 Fe(0) 源的反应生成 Fe(SPh)(Ph(2)PC(6)H(4)CO)(CO )(3) (1) 和二酰基二亚铁 Fe(2)(SPh)(2)(CO)(3)(Ph(2)PC(6)H(4)CO)(2),它们羰基化得到1. 对于体积极其庞大的芳硫酯 Ph(2)PC(6)H(4)C(O)SC(6)H(3)-2,6-(2,4,6-trimethylphenyl)(2),氧化性添加被阻止并获得膦的 Fe(0) 加合物。配合物 1 与氰化物反应生成 Et(4)N[Fe(SPh)(Ph(2)PC(6)H(4)CO)(CN)(CO)(2)] (Et(4)N[2 ])。(13)C 和 (31)P NMR 谱表明取代是立体有择的并且与 P 顺式。[2](-)