Réaction de dérivés à liaison germanium-azote (germylamines, cyclogermazanes et germa-imines transitoires) avec la di-t-butyl-3,5-orthoquinone

Multiply bonded germanium species. Recent developments

“…The germathiaphosphirane 223 heated with an excess of sulfur leads to the metadithiophosphonate 224 and the 2,4-digerma-l,3-dithietane 225. Three possible mechanisms involving formation of dimesitylgermanethione by decomposition of threeor four-membered heterocycles have been suggested to explain these for-mations96 (Scheme 54).…”

Poly[3,4‐dihydroxybenzhydrazide]: A Polydopamine Analogue?

“…We further disproved the possibility of tetrahydro‐1,4,2,3‐dioxadiazine rings as alternative isomeric structural units for PDHBH. Such ring systems were reported as a product of the reaction of an o ‐benzoquinone with germylamines . In our case, this heterocyclic motif must be formed by cycloaddition of an o ‐quinone unit with an azo moiety, both derived from the precursor 3 by oxidation (dehydrogenation) ( Scheme ).…”

The Stable Divalent Homoleptic Species (ArO)2M (Ar = 2,4,6-Tris((dimethylamino)methyl)phenyl; M = Ge, Sn, Pb)

“…The ESR spectrum (g ) 2.0018, a H ) 3.5 G) of the green solution at -40 °C, resulting from the mixture of the 3,5-di-tert-butyl-1,2benzoquinone and the divalent species in toluene, is quite comparable to the o-semiquinone spectrum obtained in other ways. [28][29][30] Thus, divalent species 2 and 3, which are singlets in the ground state, behave like electron donors, allowing immediate electron transfer to the quinone. These results agree with previous studies 31- 35 and demonstrate that germylenes, known so far for their electrophilic and nucleophilic properties, can also be involved in a single electron-transfer process in accord with recent electrochemical and theoretical studies of germylenes, stannylenes, and their complexes with Lewis bases.…”