An Uncomplexed 1,2,3‐Triborolane Derivative

(3α,4β,4aβ,7aβ,8β,8aα)‐1,2,3‐Tris(diisopropylamino)‐1,2,3,3a,44a,5,7a,8,8a‐decahydro‐4,8‐methanoindeno[5,6‐ d ]‐1,2,3‐triborol ( 1 ) is formed from dicyclopentadiene and dichloro(diisopropylamino)borane upon treatment with sodium/potassium alloy in hexane. 1,2,3‐Tris(diiso propylamino)triborane(5) ( 2 ) was also obtained. 1 is characterized by elemental analyses, spectroscopic data, and by an X‐ray structure analysis, 2 by its MS and NMR data.