Di-[(2,4,6-tri-tert-butyl)-benzoyl]-phosphan, Di-[(2,4,6-tri-tert-butyl)-benzoyl]-arsan-keto-enol-tautomerie

Dual Supermesityl Stabilization: A Room‐Temperature‐Stable 1,2,4‐Triphosphole Radical, Sigmatropic Hydrogen Rearrangements, and Tetraphospholide Anion

“…Two-component reaction between tris(trimethylsilyl)phosphane (2) and cesium fluoride (1) (3 h in dioxane at 90°C) led exclusively to the formation of cesium bis(trimethylsilyl)phosphide (4). Progress of the reactions can be accurately monitored by 31 P NMR spectroscopy, since the compounds of interest have distinctive chemical shifts: δ = -276.10 (4); [6] 33.2 (10); [7] 117.24 (11) The formation of the three products 4, 10 and 11 is expected on the basis of mechanistic studies between lithium bis(trimethylsilyl)phosphide and 2,4,6-tri-tert-butylbenzoyl chloride [7] and tris(trimethylsilyl)phosphane and cesium tert-butoxide. [6] The formation of the second three products 9, 12 and 13 is new and specific to the use of CsF.…”

Stabilization of a Snub Bisphenoidal Environment of Strontium in Bis[3‐(1‐naphthyl)‐5‐(2‐pyridyl)‐2H‐pyrazole]strontium Bis[3‐(1‐naphthyl)‐5‐(2‐pyridyl)pyrazolate] by Strong Hydrogen Bridges

“…Thus a broad variety of such compounds shows strong hydrogen bridges with an enormous low field shift with the central atoms playing a minor role; examples include metal complexes such as [(OC) 4 Re{COMe} 2 H] [δ( 1 H) = 21.79]31,32 and [(NCS)Pd{PR 2 O} 2 H] [δ( 1 H) = 15.3],33 as well as the enol forms of diacylphosphanes and ‐arsanes [δ( 1 H) values approx. 19 ppm] 34–36…”

The First Nonclassical Distonic Ion

“…Single-point MCSCF [CAS(3,3)] 17 calculations were also applied to the Becke3LYP/6-311G(d,p) optimized structure of 4 . Samples of 1 − 3 were available from other studies; details of their synthesis have been reported …”