在乙氰溶劑中，[η□-（甲氧醯基）環戊二烯]三羰甲基鎢1先與氯化三甲基矽烷 作用後後，再分別與碘化鈉、溴化鉀、氯化鈉作用產生[η□-（甲氧醯基）環戊二烯] 碘化 三羰基鎢2，[η□-（甲氧醯基）環戊二烯]溴化三羰基鎢3，[η□-（甲氧醯基）環戊二烯] 氯化三羰基鎢4，產率各為78%、64%、70%。化合物2經硝酸銀去配位基碘後，與硫氰酸 鉀作用後得37%之[η□-（甲氧醯基）環戊二烯]三羰硫氰基鎢5。化合物1-5的環戊二烯之 H(2)-H(5)氫光譜及C(2)-C(5)碳13光譜可經由二維異核相對應NMR光譜得到。(Cp-H)W(CO)□ L衍生物環戊二稀基上C(2，5)及C(3，4)碳原子所受之遮蔽效應與ferrocene相對應之取代基衍 生物相同。 After treating with chlorotrimethylsilane in acetonitrile, (η□-carbomethoxy- cyclopentadienyl) tricarbonylmethyltungsten (1) was converted to (η□- carbomethoxycyclopentadienyl) tricarbonyliodotungsten (2), (η□-carbomethoxycyclo-pentadienyl) tricarbonylbromotungsten (3), and (η□-carbomethoxycyclopentadienyl-dienyl) tricarbonylchlorotungsten (4) by reacting it with sodium iodide, potassium bromide, and sodium chloride in 78%, 64% and 70% yield, respectively. Compound 2 was in turn thiocyanated to give (η□ -carbomethoxycyclopentadienyl)tricarbonyl-thiocyanatotungsten (5) in 37% yield with potassium thiocyanate after deiodonation with silver nitrate. The chemical shifts of H(2)-H(5) protons and C(2)- C(5) carbon of 1-5 have been assigned using two-dimensional HetCOR NMR spectroscopy. An analogy was observed between the shielding of C(2, 5) and C(3, 4) carbon atoms of (Cp-H)W(CO)□L derivatives and ferrocene derivatives.
