Synthesis and structure of oligomeric dimesitylgermyl-substituted carbodiimides; characterization of higher oligomers
Dahrouch, M., Rivière-Baudet, M., Satgé, J., Mauzac, M., Cardin, C. and Thorpe, J. H. (1998) Synthesis and structure of oligomeric dimesitylgermyl-substituted carbodiimides; characterization of higher oligomers. Organometallics, 17 (4). pp. 623-629. ISSN 0276-7333
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To link to this article DOI: 10.1021/om970604k
New cyclic oligomers of dimesitylgermylene carbodiimides (Mes2GeNCN)n (n = 3 (1) and 4 (2)) were synthesized by reactions of dimesityldichlorogermane with either cyanamide in the presence of triethylamine or lithium cyanamide. The reactions always gave 1, the trimer of the hypothetical (Mes2GeN−CN), as the major compound. Higher oligomers 3 (n up to 20−30) also can be isolated, depending on the reaction conditions. In THF solution at room temperature, 2 and 3 slowly isomerize to 1, which seems to be the most stable compound. X-ray analysis of trimer 1 and tetramer 2 shows unstrained tetrahedral germanium atoms and linear diimine linkers.