名称:
Reactions of Cp*Ir(2,5-dimethylthiophene) with electrophiles, acids, and maleic anhydride
摘要:
This paper describes reactions of the two isomers (eta Cp5-*)Ir(eta (4)-2,5-Me2T) (1) and (eta (5)-Cp*)Ir(C.S-2,5-Me2T) (2), where 2,5-Me2T is 2,5-dimethylthiophene, with several electrophiles, acids, and maleic anhydride. The reactions of 1 and 2 with methyl iodide give the same product Cp*Ir(eta (4)-2,5-Me2T . CH3)(+) in which the CH3+ is bonded to the sulfur atom, as established by X-ray studies. The reaction of 1 with maleic anhydride gives two structurally characterized products: Cp*Ir[eta (1) (S)-Cp*Ir(eta (4)-2,5-Me2T)][eta (2)-C4H2O3] (13). in which S-coordinated Cp*Ir(eta (4)-2,5-Me2T) and eta (2)-maleic anhydride are ligands to the Cp*Ir unit, and another product (12) that has the composition of 13 except for one additional oxygen atom. Complex 12, with a complicated and unusual structure, is also isolated from the reaction of maleic anhydride and the acylthiolate Cp*Ir[eta (4)-C3H2MeC(=O)Me] (14). Reactions of 1 and 2 with a variety of other agents (MeS-SMe2+, CF3SO3H, HCl, H2S. EtOH and I-2) are also described. (C) 2001 Elsevier Science B.V. All rights reserved.