The reaction of the title cyclic complex(1) with sodium amal-gam in THF resulted in the expected cleavage of the Fe--Febond to afford bis-sodium salt (Me2SiSiMe2) [η5-C5H4Fe(CO)2Na]2(4). The latter was not isolated and was used di-rectly to react with MeI, PhCH2Cl, CH3C(O)Cl, PhC(O)Cl,Cy3SnCl (Cy=cyclohexyl) or Ph3SnCl to afford correspondingring-opened derivatives (Me2SiSiMe2) [η5-C5H4Fe(CO)2R]2[5, R=Me; 6, R=PhCH2; 7, R=CH3C(O); 8, R=PhC
C l2M eS iS iM eC l2与环戊二烯基锂及对甲苯基溴化镁反应,生成C5H5(p-Tol)M eS iS iM e(p-Tol)C5H5.后者再与五羰基铁反应,得到标题化合物[η5,η5-C5H4(p-Tol)M eS iS iM e(p-Tol)C5H4]Fe2(CO)2(μ-CO)2(3);同时还得到两个单硅桥连副产物[η5,η5-(p-Tol)2M eS iS iM e(C5H4)2]Fe2(CO)2(μ-CO)2(4)和[η5,η5-(p-Tol)M e2S iS iM e(C5H4)2]Fe2(CO)2(μ-CO)2(5).化合物3中顺式异构体(3a)占绝对优势,可通过简单重结晶分离出纯品.化合物3a在加热条件下发生分子内的硅硅键和铁铁键之间的复分解重排反应,生成[η5-(p-Tol)M eS iC5H4Fe(CO)2]2(6).该产物为顺反异构体的混合物(顺反异构体的摩尔比为4∶3),表明重排反应不涉及协同历程.利用X射线衍射法测定了化合物4的分子结构.