American Chemical Society
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Formation of Germenes from Bis(germavinylidene)

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journal contribution
posted on 2020-05-07, 10:02 authored by Wing-Por Leung, Kwok-Wai Kan, Cheuk-Wai So, Thomas C. W. Mak
A series of germenes have been synthesized from the bis(germavinylidene) [(Me3SiNPPh2)2CGe→GeC(PPh2NSiMe3)2] (1). The reaction of 1 with 2,2,6,6-tetramethylpiperidine N-oxide afforded [(Me3SiNPPh2)2CGe(ONCMe2C3H6CMe2)2] (2). Germavinylidene, the dissociation derivative of 1, underwent [1 + 4] cycloaddition with azobenzene, followed by a 1,3-H shift to give [(Me3SiNPPh2)2CGe(o-C6H4NHNPh)] (3). Treatment of 1 with benzil afforded the [1 + 4] cycloaddition compound [(Me3SiNPPh2)2CGe{O(Ph)CC(Ph)O}] (4). The results showed that the germavinylidene moiety dissociated from 1 acts as a synthon for the preparation of various germenes by addition to the germanium(II) center. The molecular structures of 24 have been determined.