REACTIONS OF THE ETA(5)-2,5-DIMETHYLTHIOPHENE COMPLEX CP-ASTERISK-IR(ETA(5)-2,5-ME(2)T)(2-), ME(-), (-)CH(CO(2)ME)(2) AND OH-)() WITH NUCLEOPHILES (PH()

CpIr(eta(5)-2,5-Me(2)T)(2+) (1), where Cp* = eta(5)-C(5)Me(2) and 2,5 -Me(2)T = 2,5-dimethylthiophene, reacts with PhLi to give CpIr(2,5-Me (2)T . 2Ph) and the acylthiolate CpIr(eta(4)-SC(3)H(2)MeC(=O)Me) (3) which incorporates oxygen from the tetrahydrofuran solvent and whose s tructure was established crystallographically. The analogous reaction of 1 with MeLi gives CpIr(2,5-Me(2)T . 2Me). Complex 1 reacts with (C H)-C--(CO(2)Me), to give CpIr(eta(4)-2,5-Me(2)T . C(CO(2)Me)(2)) (6), which contains an opened-ring thiolate ligand. With OH-, 1 gives both 3 and CpIr(eta(4)-2,5-Me(2)T . O) (7), which incorporates a thiophen e S-oxide ligand. These reactions are discussed in the context of rela ted reactions of eta(5)-thiophene complexes in the literature.