Synthesis of enantiomerically pure Sb-chirogenic organoantimony compounds and their crystal structures

A novel organobismuth compound, 1-[(2-di-p-tolylbismuthanophenyl)diazenyl]pyrrolidine, induces apoptosis in the human acute promyelocytic leukemia cell line NB4 via reactive oxygen species

“…Intramolecular interaction between pnictogen elements (in particular Sb, Bi) and nitrogen atoms has attracted interest [28]. We also have reported that triarylstibane and bismuthane derivatives frequently interact with nearly nitrogen, producing Sb, Bi⋯N intramolecular coordination [29][30][31]. In the case of 3 and 4 having triazene moiety, intramolecular interaction was absent between antimony/bismuth and nitrogen (N2) in solid-state: the spatial distances of Sb\N2 and Bi\N2 are 4.235(2) Å (3: Sb) and 4.257(5) Å (4: Bi) which corresponds to 113% and 108% of the sum of the van der Waals radii of both elements (N\Sb: 3.74 Å, N\Bi: 3.94 Å) [27].…”

Synthesis, Structure and Applications of Hypervalent Organoantimony Compounds Having Intramolecular E→Sb (E = N, O, S) Coordinations

“…It is described that the antimony centre is of pseudo-trigonal bipyramidal structure. Subsequently, they prepared enantiomerically pure Sb-chiral organoantimony compounds 13 bearing 4,4-dimethyl-2-oxazolinyl substituents on the ortho-position of the phenyl group (Scheme 4) [54]. The molecular structure of 13 is analogous to that of 12b; the N-Sb distance in 13 is 2.813(4) Å.…”

Synthesis, Crystal Structures, and Skeletal Inversion of Dithienodiphosphorines

“…The vertex and edge inversions [6] of pnictogens except for nitrogen have high-energy barrier enough to isolate configurational isomers and hence chiral organo phosphorus [7], arsenic [8], antimony [9], and bismuth [10] compounds have been synthesized. Although there are many reported results on the configurational isomers, trans and cis forms, of 9,10-dihydrodipnictogenanthracenes, those on the conformational isomers are so limited, because the energy barrier of the skeletal inversion is much lower than that of the vertex inversion at the 9,10-positions of 9,10-dihydrodipnictogenanthracenes [5d, 5e].…”