摘要:
Delithiochloration of N-lithio-N-dimesitylchlorogermyl-3-amino-2-methyl-thiophoate at low temperature leads to the corresponding germa-imine, stabilized by the steric effects of mesityl substituents linked to germanium and possibly by mesomeric effects with the thiophoate group. This germa-imine, stable at room temperature was characterized by spectrometry (IR, UV, RMN, DCi mass spectrometry). With specific reagents (MeOH, Et3NH+Cl-, etc.) the reactivity is different from that of cyclodiger-mazanes, dimers of germa-imines; stoichiometric addition of MeOH and HCl without cleavage of germanium-nitrogen bond is observed. 3,5-Di-t-butylorthoquinone leads to the expected germadiox-olane, through decomposition of the transient 1,4-cycloadduct observed in H-1 NMR.