名称:
Synthesis and characterization of d2-molybdenum imido complexes containing coordinated dithio-ligands. MO rationalization of the preferential isomer formation of Mo(N-2,4,6-Me3C6H2)(S2COMe)Cl(PMe3)2
摘要:
Treatment of the complex Mo(Nmes)Cl-2(PMe3)(3) (1) (mes = 2,4,6-Me3C6H2, 2,4,6-trimethylphenyl) with two equivalents of the potassium salt of methyl xanthate, KS2COMe, or the potassium 1-pyrrole-carbodithioate, KS2C(NC4H4), gave Mo(Nmes)(SS)(2)(PMe3) (S-S = S2COMe 2; S2C(NC4H4) 3). When the reaction of 1 with KS2COMe is carried out in a 1:1 stoichiometry, the complex Mo(Nmes)(S2COMe)Cl(PMe3)(2) (4) is obtained. The chlorine atom in 4 occupies the trans position with respect to the organoimido ligand. MO calculations of the EH type rationalize the preferential formation of 4 as the thermodynamically preferred isomer in this metathesis reaction. The reaction of 4 with CO produces Mo(Nmes)(S2COMe)Cl(CO)PMe3) (5). Reaction of 1 with carbon disulfide yields the complex Mo(Nmes)Cl-2(S2CPMe3) (6), containing a trihapto-(S,S',C) phosphoniumdithiocarboxylate ligand. (C) 1999 Elsevier Science S.A. All rights reserved.