Syntheses of the B(8)-hydroxy- and B((8),(8)')-dihydroxy-derivatives of the bis(1,2-dicarbollido)-3-cobalt(1-)ate ion by its reductive acetoxylation and hydroxylation: molecular structure of [8,8'-mu-CH3C(O) (2) (1,2-C2B9H10) (2) -3-Co] (0) zwitterion determined by X-ray diffraction analysis

0163326 - UACH-T 20025007 RIV GB eng J - Journal Article
Plešek, Jaromír - Grüner, Bohumír - Báča, Jiří - Fusek, Jiří - Císařová, I.
Syntheses of the B(8)-hydroxy- and B((8),(8)')-dihydroxy-derivatives of the bis(1,2-dicarbollido)-3-cobalt(1-)ate ion by its reductive acetoxylation and hydroxylation: molecular structure of [8,8'-mu-CH3C(O) (2) (1,2-C2B9H10) (2) -3-Co] (0) zwitterion determined by X-ray diffraction analysis.
Journal of Organometallic Chemistry. Roč. 649, č. 2 (2002), s. 181-190. ISSN 0022-328X. E-ISSN 1872-8561
R&D Projects: GA ČR GA104/99/1096; GA ČR GA203/99/M037
Institutional research plan: CEZ:AV0Z4032918
Keywords : bis(1,2-dicarbollido)-3-cobalt(1-)ate ion * carbaboranes * metallacarboranes
Subject RIV: CA - Inorganic Chemistry
Impact factor: 1.901, year: 2002

Preparative routes to 8-hydroxy-bis(1,2-dicarbollido)-3-cobalt(1-)ate (2) and 8,8-dihydroxy-bis(1,2-dicarbollido)-3-cobalt(1-)ate (3) ions are reported by the reductive acetoxylation of the parent bis(dicarbollido)cobaltate ion (1) followed by hydrolysis of the intermediates. The essential reagent is acetic anhydride, and strong acids are required as catalysts. For the hydroxyderivative ion 2 the simultaneous presence of acetic acid brings benefit, whereas it is detrimental for the formation of the dihydroxyderivative 3. Reaction intermediate leading to the dihydroxy derivative is the already reported [8,8'-mu-CH3C (O) (2) (1,2-C2B9H10) (2)-3-Co] (0) zwitterion. This compound was adequately characterised for the first time and its molecular structure as determined by X-ray diffraction analysis is presented. Both B-hydroxylated bis(dicarbollido)-ions can be alternatively obtained on the direct hydroxylation of the parent ion by hot 60-80
Permanent Link: http://hdl.handle.net/11104/0060577