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 - Článek v odborném periodiku
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
Grant CEP: GA ČR GA104/99/1096; GA ČR GA203/99/M037
Výzkumný záměr: CEZ:AV0Z4032918
Klíčová slova: bis(1,2-dicarbollido)-3-cobalt(1-)ate ion * carbaboranes * metallacarboranes
Kód oboru RIV: CA - Anorganická chemie
Impakt faktor: 1.901, rok: 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
Trvalý link: http://hdl.handle.net/11104/0060577