Low coordinate germanium and tin compounds (ArO)2ME and (ArO)2MM′Ln M=Ge, Sn; E=S, Se, –NSiMe3 M′=Cr, W, Fe, Pt [Ar=2,4,6-tris((dimethylamino)methyl)phenyl-]

An isolable stannaimine and its cycloaddition/metathesis reactions with carbon dioxide

An N-heterocyclic stannylene :Sn(NONAd) (NONAd = [O(SiMe2NAd)2]2-, Ad = 1-adamantyl), reacts rapidly with 2,4,6-tricyclohexylphenyl azide (TCHP)N3, affording a stannaimine, (NONAd)SnN(TCHP). Solutions of (NONAd)SnN(TCHP) react immediately with carbon dioxide (CO2) to give a [2+2]-cycloaddition product, which, upon heating, subsequently engages in a metathesis process to give [Sn(NONAd)(μ-O)]2 and the bulky isocyanate, (TCHP)NCO.

Bonding Relationship between Silicon and Germanium with Group 13 and Heavier Elements of Groups 14-16

The topic of heavier main group compounds possessing multiple bonds is the subject of momentous interest in modern organometallic chemistry. Importantly, there is an excitement involving the discovery of unprecedented compounds with unique bonding modes. The research in this area is still expanding, particularly the reactivity aspects of these compounds. This article aims to describe the overall developments reported on the stable derivatives of silicon and germanium involved in multiple bond formation with other group 13, and heavier groups 14, 15, and 16 elements. The synthetic strategies, structural features, and their reactivity towards different nucleophiles, unsaturated organic substrates, and in small molecule activation are discussed. Further, their physical and chemical properties are described based on their spectroscopic and theoretical studies.

The Reactivity of Germanium Phosphanides with Chalcogens

The reactivity of germanium phosphanido complexes with elemental chalcogens is reported. Addition of sulfur to [(BDI)GePCy₂] (BDI = CH{(CH₃)CN-2,6-iPr₂C₆H₃}₂) results in oxidation at germanium to form germanium(IV) sulfide [(BDI)Ge(S)PCy₂] and oxidation at both germanium and phosphorus to form germanium(IV) sulfide dicylohexylphosphinodithioate complex [(BDI)Ge(S)SP(S)Cy₂], whereas addition of tellurium to [(BDI)GePCy₂] only gives the chalcogen inserted product, [(BDI)GeTePCy₂]. This reactivity is different from that observed between [(BDI)GePCy₂] and selenium. Addition of selenium to the diphenylphosphanido germanium complex, [(BDI)GePPh₂], results in insertion of selenium into the Ge-P bond to form [(BDI)GeSePCy₂] as well as the oxidation at phosphorus to give [(BDI)GeSeP(Se)Ph₂]. In contrast, addition of selenium to the bis(trimethylsilyl)phosphanido germanium complex, [(BDI)GeP(SiMe₃)₂], yields the germanium(IV) selenide [(BDI)Ge(Se)P(SiMe₃)₂].

Reactivity of heavy carbene analogues towards oxidants: a redox active ligand-enabled isolation of a paramagnetic stannylene

We report the first isolated paramagnetic stannylene enabled by a redox active ligand.

Synthesis of a Manganese Germavinylidene Complex from Bis(germavinylidene)

The reaction of bis(germavinylidene) [(Me3SiN=PPh2)2C=Ge-->Ge=C(PPh2=NSiMe3)2] (1) with CpMn(CO)2(THF) (Cp = eta5-C5H5) in THF afforded [(Me3SiN=PPh2)2C=Ge-->Mn(CO)2Cp] (2). Similar reaction of 1 with (cod)RhCl (cod = 1,5-cyclooctadiene) in THF gave [(Me3SiN=NPPh2)2{(cod)Rh}C-GeCl] (3). The results suggested that reactive germavinylidene may exist in solution. The X-ray structures of 2 and 3 have been determined.