Boron-based stepwise dioxygen activation with 1,4,2,5-diazadiborinine

• Main Authors: Wang, Baolin, Kinjo, Rei
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2019
• Subjects: DRNTU::Science::Chemistry; Boron; Oxygen Activation
• Online Access: https://hdl.handle.net/10356/105504; http://hdl.handle.net/10220/47811
• Institution: Nanyang Technological University

Activation of dioxygen (O2) by 1,4,2,5-diazadiborinine 1 is reported. Two boron centers in 1 undergo a formal [4 + 2] cycloaddition with O2 at room temperature affording a bicyclo[2.2.2] molecule 2 featuring a B–O–O–B unit. Treatment of 2 with an additional equivalent of 1 leads to the cleavage of the O–O bond in 2 concomitant with the formation of two B–O bonds to yield 4 involving the extremely rare B4C2N2O2 ten-membered rings. A series of these reactions demonstrate the stepwise scission of the O[double bond, length as m-dash]O π-bond and the O–O σ-bond of O2.