Cycloadditions of Diarylgermylenes to a Diazabutadiene [1]

The reaction of tetrakis(2‐tert‐butyl‐4,5,6‐trimethylphenyl)digermene, which dissociates into the germylene molecules 2 in solution, with 1,4‐diisopropyl‐1,4‐diazabuta‐1,3‐diene ( 3 ) furnishes the 4+1] cycloaddition product of 2 to the nitrogen atoms of 3 . Under drastic conditions tetrakis(2,4,6‐triisopropylphenyl)digermene also forms the germylene molecules 6 which react with 3 in a similar fashion to afford the corresponding 4+1] cycloadduct.