6533b835fe1ef96bd129fdd5

RESEARCH PRODUCT

The Zwitterion [8,8′-μ-CH2O(CH3)-(1,2-C2B9H10)2-3,3′-Co]0 as a Versatile Building Block To Introduce Cobalt Bis(Dicarbollide) Ion into Organic Molecules

subject

description

The synthesis of a new bridged [8,8′-μ-CH2O(CH3)-(1,2-C2B9H10)2-3,3′-Co]0 derivative (2), arising from the acid-catalyzed reaction of cobalt bis(1,2-dicarbollide)(1−) ion with formaldehyde, is reported. The proposed reaction path is supported by the isolation of side products including two zwitterionic compounds, the known bridged [8,8′-μ-(CH3O)-(1,2-C2B9H10)2-3,3′-Co]0 derivative (3), the new zwitterion [(8-(CH3)2O-1,2-C2B9H10)-(1′,2′-C2B9H11)-3,3′-Co]0 (4), and two anionic compounds—the known [(8,8′-Cl2-1,2-C2B9H10)2-3,3′-Co]− and the newly characterized dimethoxy derivative [(8,8′-(CH3O)2-1,2-C2B9H10)2-3,3′-Co]− of the cobalt bis(dicarbollide) ion. Compound 2 serves as a versatile building block for the construction of zwitterionic derivatives, as exemplified by the synthesis of a series of compounds of general formulation [(8-X-CH2-1,2-C2B9H10)(8′-CH3O-1′,2′-C2B9H10)-3,3′-Co]0 (6). Compounds of type 6 bear organic end groups (X = NC5H5 (6a), C6H13NH2 (6b), 2-HOC2H4NH2 (6c), (C6H5)3P (6d)) adjacent to ...