193482-79-0

Upstream product

• 193338-96-4 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl-1,3,5,2,4,6-triselenatribismane 

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• 444167-52-6 2,4-bis[2,4,6-tris[bis(trimethylsilyl)methyl]phenyl]1,3,2,4-dioxadibismetane 

Relevant academic research and scientific papers

Doubly bonded systems between heavier Group 15 elements

There has been much interest in the synthesis and properties of doubly bonded systems between heavier Group 15 elements, i. e. heavier analogues of azo-compounds (dipnictenes), from the viewpoints of fundamental and material chemistry. Although such double-bond compounds between heavier main group elements are known to be highly reactive, too much so to be isolated as stable compounds, a number of reports on the synthesis of kinetically stabilized diphosphenes (RP=PR), diarsenes (RA=AsR), and phosphaarsenes (RP=AsR) bearing bulky substituent have been published since 1980. We have also succeeded in the synthesis of the first stable distibene (RSb=SbR) and dibismuthene (RBi=BiR) by taking advantage of efficient steric protection groups, 2,4,6- tris[bis(trimethylsilyl)methyl]phenyl (Tbt) and 2,6-bis[bis(trimethylsilyl) methyl]-4-[tris(trimethylsilyl)methyl]phenyl (Bbt), and revealed their structures and properties systematically. Thus, the doubly bonded compounds between heavier Group 15 elements are no longer imaginary species but are those with real existence which are stable, even in the case of the heaviest non-radioactive element bismuth, when they are appropriately protected by bulky substituents. This Perspective describes our research on the chemistry of kinetically stabilized double-bond compounds between heavier Group 15 elements.

Syntheses, structures and properties of kinetically stabilized distibenes and dibismuthenes, novel doubly bonded systems between heavier group 15 elements

The first stable distibene (RSb=SbR) and dibismuthene (RBi=BiR) were successfully synthesized by taking advantage of steric protection using an efficient steric protection group, 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt). Since it is quite difficult to investigate the reactivities of the distibene (TbtSb=SbTbt) and dibismuthene (TbtBi= BiTbt) in solution due to their extremely low solubility values, similarly overcrowded distibene and dibismuthene, BbtE=EBbt (E = Sb, Bi), with sufficiently high solubility were also synthesized using another bulky substituent, 2,6-bis[bis(trimethylsilyl)methyl]-4-[tris(trimethylsilyl)methyl]phenyl group (Bbt). The crystallographic analysis and spectroscopic studies of these stable dipnictenes led to the systematic comparison of structural parameters and physical properties for all homonuclear doubly bonded systems between heavier group 15 elements. In addition to these experimentally obtained results, theoretical calculations for these doubly bonded systems also revealed the intrinsic character of dipnictenes.

Deselenation of overcrowded triselenane derivatives containing bismuth: Synthesis and structure of the first stable dibismuthene

Deselenation of an overcrowded triselenatribismane, 2,4,6-{2,4,6-tris[bis(trimethylsilyl)methyl]phenyl}-1,3,5-triselenatribismane, with hexamethylphosphorous triamide resulted in the formation of the first stable dibismuthene {TbtBi=BiTbt; Tbt = 2,4,6-tri