Partial and Complete Replacement of the Phenyl Group(s) of 1,1,3,3‐Tetraphenyl‐2,2,4,4‐tetrakis(trimethylsilyl)cyclotetrasilane by Chlorine Atom(s)

Abstract

The four phenyl groups of 1,1,3,3‐tetraphenyl‐2,2,4,4‐tetrakis(trimethylsilyl)cyclotetrasilane were partially replaced by chlorine atom(s) by successive treatment with trifluoromethanesulfonic acid and lithium chloride. The replacement of all phenyl groups was carried out with hydrogen chloride in the presence of aluminum chloride. The structural features of the resulting mono‐, di‐, and tetrachlorocyclotetrasilanes were compared by X‐ray crystallography.

The Chlorido-Bismuth Dication: A Potent Lewis Acid Captured in a Hepta-Coordinate Species with a Stereochemically Active Lone Pair

“…Starting from the easily accessible phenylbismuth dichloride, the addition of two equivalents of AgBF 4 in DMSO, and subsequent protonolysis with a solution of hydrogen chloride in diethyl ether, 22 afforded a straightforward method for the preparation of the rare chlorido-bismuthenium dication [BiCl(dmso) 6 ][BF 4 ] 2 ( 1 ) ( Scheme 1 a). Remarkably, a sublimation approach could also successfully be employed in order to obtain crystals of 1 that were suitable for single-crystal X-ray diffraction analysis (XRD).…”