From borapyramidane to borole dianion

Vladimir Ya Lee (1) , Haruka Sugasawa (1) , Olga A. Gapurenko (2) , Ruslan M. Minyaev (2) , V. I. Minkin (2) , Heinz Gornitzka (3, 4) , A. Sekiguchi (1)

1 Graduate School of Pure and Applied Sciences, University of Tsukuba
2 Institute Phys. Org. Chem.
3 LCC - Laboratoire de chimie de coordination
4 UT3 - Université Toulouse III - Paul Sabatier

Nonclassical pyramidanes with their inverted tetrahedral configuration of the apical atom are among the most challenging synthetic targets in cluster chemistry. In this Communication, we report on the synthesis and structure of the first representative of pyramidal compounds with the group 13 element at the apex, namely, chloroborapyramidane 2. Reduction of 2 with excess of lithium metal unexpectedly produced the cage-opening product, borole dianion derivative 32–·[Li(thf)+]2, a 6π-electron aromatic system.

Domaines: Chimie de coordination

Vladimir Ya Lee, Haruka Sugasawa, Olga A. Gapurenko, Ruslan M. Minyaev, V. I. Minkin, et al.. From borapyramidane to borole dianion. Journal of the American Chemical Society, 2018, 140 (19), pp.6053-6056. ⟨10.1021/jacs.8b03473⟩. ⟨hal-01963524⟩