First Stereochemical Characterization of Configurationally Stable Diastereomers of Hypervalent Stiboranes (10-Sb-5) and Acceleration of Intramolecular Permutation by Donor Solvents

The synthesis of organoantimony(III) difluorides containing Y,C,Y pincer type ligands using organotin(IV) fluorinating agents

“…These values indicate a further attenuation of this coordination, when compared with corresponding dichloride and diiodide [2,6-(MeOCH 2 )C 6 H 3 ]SbX 2 (Sb-O bond lengths 2.523(2), 2.577(2) Å , X = Cl; 2.293(2), 2.279(2) Å , X = I) [22]. The bond distances Sb1-F1 1.948(2) and Sb1-F2 1.957(2) Å are comparable to those found for Sb-F terminal bonds in other organoantimony fluorides [9,32]. The overall coordination polyhedron around the central atom can be best described as a strongly distorted square pyramid with axial carbon C1 and the basal plane formed with both F1, F2 and oxygens atoms O1, O2 (S of angles describing SbO 2 F 2 girdle is 350.88) [33].…”

A New Method for the Formation of Anti‐apicophilic (O‐cis) Spirophosphoranes – Kinetic Studies on the Stereomutation of O‐cis Arylspirophosphoranes to Their O‐trans Isomers

“…This is in agreement with previously reported stereomutation between diastereomeric O-trans stiboranes. [16] It must be pointed out that there is a possibility that the turnstile mechanism is the actual pathway. [17] Unfortunately, we presently have no experimental means to judge the validity of this often-proposed mechanism.…”

Novel results obtained by freezing berry pseudorotation of phosphoranes (10‐P‐5)

“…The configuration of phosphate 10 could not be determined with certainty because of rapid decomposition by trace amounts of H 2 O. However we have already characterized the corresponding hexacoordinate fluoroantimonate with two Martin ligands by X-ray analysis [11] and therefore, in phosphate 10, the fluorine atom is also likely to be located anti to the oxygen because of the trans influence of the fluorophosphate. These can be explained by the attack of the fluoride anti at the P O or Sb O (equatorial) bond of the O-cis isomer.…”