Citation: He Ping WU, Er Run DING, Yuan Qi YIN, Xiao Ying HUANG, cKai Bei YU. STUDY　ON　REACTION　OF　(μ₃-CCO₂Et) CO₂M (CO)₈ (CpMe) (M=Mo,W)　WITH　Na₂[Fe(CO)₄]．SYNTHESIS　OF　TWO　KINDS　OF　THE　NOVEL　CLUSTERS　EtO_{2_{CCFeCoM (CO)₈(CpMe) H　AND　(OCC)FeCoM (CO)₈ (CpMe)[J]. Chinese Chemical Letters,
;1996, 7(4): 381-384.}} shu

STUDY　ON　REACTION　OF　(μ₃-CCO₂Et) CO₂M (CO)₈ (CpMe) (M=Mo,W)　WITH　Na₂[Fe(CO)₄]．SYNTHESIS　OF　TWO　KINDS　OF　THE　NOVEL　CLUSTERS　EtO_{2_{CCFeCoM (CO)₈(CpMe) H　AND　(OCC)FeCoM (CO)₈ (CpMe)}}

a Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000
b Fuzhou Institute on Structure of Matter, Station Key Laboratory of Structure Chemistry, Fuzhou 350002
c Chengdu Center of Analysis and Measurement, Chinese Academy of Sciences, Chengdu 610041

Received Date: 14 August 1995

Fund Project: This work is surpported by Shanghai Organometallics Laboratory, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences.

The reactions of clusters (μ₃-CCO₂Et) Co₂M (CO)₅ (MeCp) [M=Mo (2a),W (2b)],derived from the reaction of (μ₃-CCO₂Et) Co₃ (CO)₉ with Na [M (CO)₃ (MeCp)],with Na₂ [Fe (CO)₄] in THF at reflux not only gave the expected metal fragment exchange products (μ₃-CCO₂Et) FeCoM (CO)₆ (Me-Cp) H [M=Mo (3a),W (3b)] but also produced the unexpected compounds (μ₃-CCO) FeCoM (CO)₅ (MeCp) [M=Mo (4a),W (4b)].It is suggested that the formation of two kinds of compounds resulted from two competitive reactions of the intermediates [(μ₃-CCO₂Et)FeCoM (CO)₅(MeCp)] with H⁺:the one is the protonic reaction of the intermediate giving the cluster 3a,b;the another one is the intermolecular nucleophilic substitution reaction of the intermediate under the H⁺ catalytic action giving the cluster 4a,b.
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