Non-classical Diboriranes

Experimentally, derivatives of 1C such as la-c [14-16] as well as of the anion 2A, the corresponding base [17, 18] common to compounds of type IB and 1C, were obtained by various routes. 

4c2e non-planar n bond distorted towards o. The four dashed lines in the transition state 5a represent six electrons (R = SiMe3, Dur = 2,3,5,6-tetramethylphenyl). 

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