With germanium-nitrogen bonds

Apparently the germanium-nitrogen bond in the substituted aliphatic amines and in the substituted heterocycles with more than one nitrogen atom in the ring is very reactive toward reagents with a distinctly acidic character, e.g., phenol and ethyl alcohol. An entirely different behavior was found for tributylgermanium-substituted indole, pyrrole, succinimide, and phthalimide, which are completely stable toward these reagents, or at most react very slowly. 

The compounds with a reactive germanium-nitrogen bond readily undergo transamination and substitution reactions with compounds having proton-active hydrogen atoms. In particular the transamination reaction offers a route to many other germanium derivatives. It may be expected, therefore, that the digermazanes will prove to be very suitable intermediates for the preparation of many new compounds. 

Dehydrohalogenation reactions appeared to be a convenient route to double bond germanium nitrogen species and were commonly carried out with an organolithium compound as a base.3,4 5b 6 7 96,97 123 Accordingly, the synthesis of two moderately hindered stable germanimines Mes2Ge = NR 136 and 137 has been reported.59 Stabilization in these cases is achieved... 

Comparison of theoretical data with experimental spectra led also to the identification of compounds which have germanium-nitrogen double and triple bonds. Foucat et al. report about the results of flash vacuum thermolysis of substituted germacyclopentenes and DFT (B3LYP) calculations of model compounds of possible reaction products114. The authors took the experimental photoelectron (PE) spectra and compared them with... 

By variation of the substitution pattern of the amidinate ligands and of the silicon or germanium coordination centers, we obtained a number of compounds with a variable degree of Si/Ge-N hypervalent interaction, i.e. compounds with essentially no bones and ones with very strong element-nitrogen bonds ( double bonds ) are formed, providing tetra-, penta- or hexa-coordinated species [4], New or newly structurally characterized examples of silicon amidinate complexes with pentacoordinate silicon are obtained (Eq. 1 Table 1). 

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