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Abstract
2,5-Dimetalla-azolidines were obtained by reactions between diamino lithium compounds and bis-1,2-(dimetallachloro) ethanes (metal = Ge, Si). The bis -1,2-(digermachloro)ethanes were synthesized by addition of the corresponding hydrochlorogermanes to acetylene under U.V. irradiation.
All the new compounds were characterized by 1H and 13C NMR and IR spectroscopy. NMR and IR data are compared with those obtained for the corresponding mono germylated azolidines.
The chemical reactivity of 2,5-digerma-azolidines towards cleavage by methanol and addition to phenylisocyanate has been studied. Insertion of phenylisocyanate into the Ge-N bond of bis-2,5-(methylphenylgerma)azolidine is regioselective and leads to diastereoisomers in proportions close to those of the isomers in the starting materials.