Monocarbaborane Anions with 10 or 12 Vertices

Polar Liquid Crystals Derived from Sulfonium Zwitterions of the [closo‐1‐CB11H12]– Anion

“…The preparation of 12‐sulfonium zwitterions 1[ n ] took advantage of our recently developed method for functionalization of closo ‐borates . Thus, the parent anion B , prepared by a modified literature procedure, was C ‐alkylated according to the previously published procedure, and the resulting C ‐alkyl products 4[ n ] were treated with PhI(OAc) 2 (Scheme ). The desired 12‐phenyliodonium derivatives 5[ n ] were easily separated from small amounts of the 7‐iodonium isomers by chromatography .…”

Improved and Scalable Synthesis of [Et4N][closo-1-CHB9H9]

“…The synthetic procedure of the [closo-2-CHB 9 H 9 ] − anion from B 10 H 14 includes six steps represented by eqs 1−6, as reported in the literature, in which the cation exchange reactions were carried out (eqs 2−4) in considering the different solubilities of the different salts. 18 After systematically examining the reaction conditions of the Brellochs method, we have found that the isolation of the intermediate of the [arachno-6-CH 2 B 9 H 12 ] − anion is not necessary, and the isomerization can be carried out without a solvent and completed in 1 h at 150 °C (Scheme 2). We have also found that the cation exchange reactions (eqs 2−4) can be avoided instead of extracting the potassium salt formed in the first step Finally, conversion of the potassium salt to the [Et 4 N] + salt leads to the precipitate of the product.…”

“…The turning point comes after the Brellochs method being proposed as shown in path E . The Brellochs method ,, consisted in the reactions of B 10 H 14 with formaldehyde in an aqueous alkaline solution to isolate the [ arachno -6-CH 2 B 9 H 12 ] − anion, and its oxidation by iodine in an alkaline solution results in the closing of the carborane cage to give the [ closo -2-CHB 9 H 9 ] − anion. Then, positional isomerism of the cluster carbon under heating in alcohol or dimethoxyethane (DME) leads to the formation of the [ closo -1-CHB 9 H 9 ] − anion.…”

Boron Hydrogen Compounds for Hydrogen Storage and as Solid Ionic Conductors

“…Decaborane(14) B 10 H 14 has been previously prepared in large quantities as solid rocket fuel [62] and can also be used as a starting material for the synthesis of closo hydridoborates and closo hydridocarborates. [63] In aqueous solution, decaborane (14) has also been reported to be a Brönsted acid forming B 10 H 13 when reacted with a base. [64] During the decomposition of solid borohydrides, the evolution of B 2 H 6 can be observed.…”