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A series of iron-sulfur cluster complexes (μ-RS) (μ-EtOC(O)CH_2S)Fe_2(CO)_6(A) havebeen synthesized by reductive cleavage of an S--S bond of μ-S_2Fe_2(CO)_6 with Grignard reagents,followed by nucleophilic substitution of the intermediates, (μ-RS) (μ-XMgS)Fe_2(CO)_6(B) towardClCH_2C(O)OEt. The complexes (A) may be also synthesized by CF_3COOH-aidolysis of (B), fol-lowed by condensation of (μ-RS) (μ-HS)Fe_2(CO)_6(C) with CICH_2C(O)OEt in the presence of Et_3N.For the former method, the manipulations are more convenient and the starting materials are measily available and much cheaper. Through conformational analysis, it has been shown that eachof the complexes is a mixture of either three conformers of ae, ee and ea or two conformers in a givenratio.
A series of iron-sulfur cluster complexes (μ-RS) (μ-EtOC (O) CH_2S) Fe_2 (CO) _6 (A) havebeen synthesized by reductive cleavage of an S-S bond of μ-S_2Fe_2 (CO) The complexes (A) may be further synthesized by CF_3COOH-aidolysis of the ligands with Grignard reagents followed by nucleophilic substitution of the intermediates, (μ-RS) (μ-XMgS) Fe_2 (CO) (B), fol-lowed by condensation of (μ-RS) (μ-HS) Fe_2 (CO) _6 (C) with CICH_2C (O) OEt in the presence of Et_3N.For the former method, the manipulations are more convenient and the starting materials are measily available and much cheaper. Through conformational analysis, it has been shown that eachof the complexes is a mixture of either three conformers of ae, ee and ea or two conformers in a givenratio.