Synthesis and Reactions of π-Conjugated Iminoboranes Stabilized by Intramolecular Imine Groups
作者:Liang Xie、Jianying Zhang、Hongfan Hu、Chunming Cui
DOI:10.1021/om4008407
日期:2013.12.9
Reduction of the boron difluorides HC[(CBut)-(NAr)](2)BF2 led to CN bond cleavage to give the iminoborane [C(Bu-t)CHC(Bu-t)NAr]B-NAr (2, Ar = 2,6-Me2C6H3; 2', Ar = 2,6-Pri(2)C(6)H(3)) stabilized by an intramolecular imine group. Reaction of 2 with NHC resulted in nucleophilic attack on the a-carbon atom to give [C(Bu-t)(NHC)CHC(Bu-t)NAr]B-NAr (3). 2 reacted with CO2 to give [C(Bu-t)CHC(Bu-t)NAr]B(CO2)NAr (4).
Synthesis and Characterization of B-Heterocyclic π-Radical and Its Reactivity as a Boryl Radical
The first isolation and full characterization of the stable, persistent diazaboracyclic neutralradical 3 is reported. Reduction of base-stabilized difluororoborane 2 provided radical 3 as a neutral molecule having a planar sp(2) boron atom attached to one fluorine and two nitrogen atoms. ESR spectroscopy and DFT calculations indicated that the unpaired electron is delocalized over the six-membered