86553-79-9Relevant academic research and scientific papers
GERMANONES ET GERMATHIONES: REACTIVITE VIS-A-VIS DE PETITS CYCLES ORGANIQUES
Barrau, Jacques,Rima, Ghassoub,Lavayssiere, Helene,Dousse, Gabriel,Satge, Jacques
, p. 227 - 242 (2007/10/02)
Dialcoylgermanones and dialcoylgermathiones are generated from various germa-heterocyclic precursors and dimeric or trimeric forms (R2GeO)2 and (R2GeS)3.These species (X = O, S) react with various three- or four-membered rings (n = 2, Y = O, S, NR, CHCN; n = 3, Y = O, S) to lead to the germaheterocycles (X = O, S).Cyclogermathianes (R2GeS)3 lead very easily, by thermic and catalytic dissociation to the germathiones .Basic solvent (Et3N, HMPA) and catalysts induce these dissociations.Mechanism and stereochemistry ofinsertion reactions of these transient species (X = O, S) into oxirane rings are established from cis- and trans-butene oxides.The formation of germanium hexacoordinated intermediate complex can explain the observed stereoselectivity.With germathiones the stereoselectivity derives from the strong nucleophilic activity of these species.
