Experimental evidence and bond characterization of a cyclopropenylgermylene

The p-anisyl(1,2,3-tri-tert-butylcycloprop-2-en-1-yl)germylene (2) was generated by reduction of the corresponding dichlorogermane. DFT calculations revealed that the cis-2-germabicyclo[1.1.0]butane-like structure cis-5 is 8.0 kJ/mol more stable than cis-2. The NBO analysis revealed that cis-5 has a 2-germabicyclo[1.1.0]butane diradical character.