Reactivity of [Cp*Mo(CO)a??Me] with chalcogenated borohydrides Li[BHa??Ea??] and Li[BHa??EFc] (Cp* = (??a?μ-Ca?…Mea?…); E = S, Se or Te; Fc = (Ca?…Ha?…-Fe-Ca?…Ha??))

摘要

Reactivity of [Cp*Mo(CO)a??Me], 1 with various chalcogenide ligands such as Li[BHa??Ea??] andLi[BHa??EFc]] (E = S, Se or Te; Fc = (Ca?…Ha?…-Fe-Ca?…H&#8324)) has been described. Room temperature reaction of 1 with Li[BHa??Ea??] (E = S and Se) yielded metal chalcogenide complexes [Cp*Mo(CO)a??(??2-Sa??CCH3)], 2 and [Cp*Mo(CO)a??(??1-SeCa??Ha?…)], 3. In compound 2, {Cp*Mo(CO)2} fragment adopts a four-legged piano-stool geometry with a ?·2-dithioacetate moiety. In contrast, treatment of 1 with Li[BH3(EFc)] (E = S, Se or Te; Fc = Ca?…Ha?…-Fe-Ca?…Ha??) yielded borate complexes [Cp*Mo(CO)a??(??-H)(??-EFc)BHa??], 4-6 in moderate yields. Compounds 4-6 are too unstable and gradual conversion to [{Cp*Mo(CO)a??}a??(??-H)(??-EFc] (7: E = S; 8: Se) and [{Cp*Mo(CO)a??}a??(??-TeFc)a??], 9 happened by subsequent release of BHa??. All the compounds have been characterized by mass spectrometry, IR, multinuclear NMR spectroscopy and structures were unequivocally established by crystallographic analysis for compounds 2, 3 and 7.