400644-09-9Relevant academic research and scientific papers
Anion stability in stannylium, oxonium, and silylium salts of the weakly coordinating anion [C6F4-1,2-{B(C6F5)2} 2(μ-OCH3)]-
Henderson, Lee D.,Piers, Warren E.,Irvine, Geoffry J.,McDonald, Robert
, p. 340 - 345 (2002)
Reaction of [Ph3C]+[C6F4-1,2-({B(C6F5 )2}2(μ-OCH3)]-, 1, with Bu3SnH gives the solvated stannylium ion [Bu3Sn(arene)]+[C6F4-l,2-{B(C6 F5)2}2(μ-OCH3)]-, 2, as a light brown oil (δ 119Sn = 434 ppm). This material is thermodynamically stable toward transfer of the chelated OMe- anion to "Bu3Sn+" as evidenced by the reaction of free diborane C6F4-1,2-[B(C6F5)2]2 with 2 equiv of Bu3SnOMe. This reaction produces the stannyloxonium complex [(Bu3Sn)2OCH3]+[C6F4 -1,2-{B(C6F5)2}2(μ-OCH 3)]-, 3 (δ 199Sn = 277 ppm), which is stable at -60 °C. Upon warming, the cation in 3 undergoes decomposition to unidentified products, while the anion remains intact. Ion pair 2 reacts rapidly with ethereal HCl in CH2Cl2 to generate Bu3SnCl and the oxonium acid [(Et2O)2H]+[C6F4-1,2-{B(C 6F5)2}2(μ-OCH3)]- , 4, isolated in 76% yield as a white, crystalline solid. Acid 4 is thermally stable in solution and was characterized crystallographically. The C2B2OMe core of the anion in 4 deviates from planarity due to intermolecular interactions in the crystal, in contrast to the structures found in other ion pairs with this anion. Reaction of 2 with anhydrous HCl gives the unsymmetrical MeOH adduct of C6F4-1,2-[B(C6F5)2]2 , 5, which was separately synthesized by direct reaction of methanol with the free diborane. The anion [C6F4-l,2-{B(C6F5)2} 2(μ-OCH3)]- is not stable in the presence of the triethylsilylium ion, generated from 1 and Et3SiH.
