A Distibene with Extremely Long Sb=Sb Distance and Related Heavier Dipnictenes from Salt‐Free Metathesis Reactions

Abstract

Conversions of organoelement diamides, ArDippE(NMe2)2 (E=Sb, Bi; ArDipp=C6H3‐2,6‐Dipp2), with Ph2SnH2 as reducing agent gave access to low‐valent, heavier group 15 dimers ArDippSb=SbArDipp and ArDippBi=BiArDipp, while only readily removable byproducts (i. e. dihydrogen, amines) and cyclo‐(Ph12Sn6) are generated during the reaction. Moreover, experiments involving the reaction of organoantimony hydride species Ar*2SbH (Ar*=C6H2‐2,6‐(Ph2CH)2‐4‐iPr) with Bi(NEt2)3 yielded a second novel distibene, Ar*Sb=SbAr*, with the currently longest Sb−Sb bond distance of 2.8605(5) Å in a distibene. In conversions of TbbSnH3 (Tbb=C6H2‐2,6‐(CH(SiMe3)2)2‐4‐tBu) with Bi(NEt2)3, ligand migration resulted in the isolation of TbbBi=BiTbb. Remarkably, the herein reported novel inorganic coupling route enables preparation and isolation of heavier dipnictenes without the formation of inorganic salts. All four low‐oxidation state compounds were isolated and subsequently characterized using state of the art techniques, i. e. X‐ray crystallography, NMR and UV/Vis spectroscopy.

An Air‐Stable Storage Compound for White Phosphorus: Reversible Addition to a Stannylene and Chemical Release of P4

“…Recently we reported the application of aryl halides of type Ar*X (Ar* = 2,6-bis(benzhydryl)-4-iPr-phenyl) as substituents stabilizing low oxidation state group 15 compounds showcasing their potential as a ligand in low coordinate main group chemistry. [24] Employing Ar* as stabilizing ligand in the abovementioned study allowed the isolation of a distibene with the currently longest Sb=Sb distance of 2.8605(5) Å. Consequently, we planned the preparation of corresponding organotin (II) species Ar* 2 Sn, to investigate the potential of the same ligand in the stabilization of heavier tetrylenes.…”