BISPHENYLENECOSAN as highly selective Cs+ extraction agent

C−H Bond Activation of Arenes by [8,8′-μ-I-3,3′-Co(1,2-C2B9H10)2] in the Presence of Sterically Hindered Lewis Bases

“…The iodonium derivative is easily accessible by reaction of the monoiodo derivative [8-I-3,3′-Co(1,2-C 2 B 9 H 10 )(1,2-C 2 B 9 H 11 )] − with AlCl 3 in benzene . Reactions of 2 with Lewis bases presumably proceed through the iodonium bridge opening with generation of a quasi-borinium cation at position 8 of the metallacarborane cage followed by attack with a Lewis base, resulting in bifunctional derivatives [8-L-8′-I-3,3′-Co(1,2-C 2 B 9 H 10 ) 2 ] (L = NH 3 , NEt 3 , Py, NCR (R = Me, Ph, CHCH 2 ), SMe 2 , O(CH 2 CH 2 ) 2 O). − On the other hand, combinations of sterically hindered Lewis acids and Lewis bases, termed frustrated Lewis pairs, do not form classical Lewis acid−Lewis base adducts, but are able to activate various small molecules (H 2 , CO 2 , carbonyl compounds, alkenes, dienes, alkynes) . In the present work we studied reactions of 2 with Lewis bases in aromatic solvents.…”

Caesium ion sequestration by a fluoro-metallocrown [16]-MC-8

“…As well as precipitation 14 and ion exchange, 15 host-assisted solvent extraction offers viable means of removal. Suitable proposed hosts including complex calixarenes, 16 hydroborate clusters 17 and metallaboranes 18 all have the common drawback of non-trivial fabrication. To this end we suggest that our fluoro-metallocrown represents a novel complexant for such a purpose with the considerable benefit of facile one pot synthesis from commercially available starting materials.…”

Extraction with Metal Bis(dicarbollide) Anions

“…Reaction conditions have been optimized to give up to ca. ), provided that some aromatic sulpho compounds, designed and used as solubilizers, are added to the organic phase (see Section VII.D) [111]. The compounds with arylene substituents 37 to 39 were the subject of relatively extensive extraction tests.…”

“…They are mutually inclined by 72° and intersect in the original symmetry axis crossing the central Co atom of the anion. At 0.4 M concentration of DEPSAM in toluene a 5×10 -3 M solution H + 37can be prepared and the solubility increases to 1×10 -2 M for 0.8 M DEPSAM [111]. The derivative 37 was also named BISPHECOSAN.…”

“…Some other commercially available solubilizers as dioctyl sebacate and dioctyl adipate were also used in the study, and screening tests were done with the ethyl derivative 39 [111].…”