Abstract
Reductive halogen elimination from di-t-butyldichlorogermane gives hexa-t-butylcyclotrigermane ( 2) in low yield. The X-ray structure analysis of 2 reveals an equilateral triangle of D 3 symmetry with very long GeGe (256.3(1) pm) and GeC (205.6(3) pm) bonds. Hexa-t-butyldigermane ( 6) is formed analogously by treatment of tri-t-butylchlorogermane with lithium naphthalenide. The molecular structure of 6 has the longest GeGe ( d|− 271.0 pm) and GeC ( d|− 207.6 pm) bonds found in any molecule up to now. Despite the extreme bond lengths, 6 is thermally and solvolytically very stable.
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