A Free Cyclotrigermenium Cation with a 2π-Electron System

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Science  03 Jan 1997:
Vol. 275, Issue 5296, pp. 60-61
DOI: 10.1126/science.275.5296.60

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The reaction of tetrakis(tri-tert-butylsilyl)cyclotrigermene with trityl tetraphenylborate in benzene produces tris(tri-tert-butylsilyl)cyclotrigermenium tetraphenylborate [(tert-Bu3SiGe)3+BPh4], which can be isolated as a yellow solid that is stable in the absence of air. The crystal structure of the cyclotrigermenium ion reveals a free germyl cation with a 2π-electron system. The three germanium atoms form an equilateral triangle similar to the carbon analog, the cyclopropenium ion.

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