Cyclopropanation and Isomerization
Reactions of β-Diketiminato
Boron Complexes
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Abstract
The reaction of HC[(CBu<sup><i>t</i></sup>)(NAr)]<sub>2</sub>Li with BCl<sub>3</sub> yielded the azaallyl boron dichloride
[ArNC(Bu<sup><i>t</i></sup>)C(H)C(Bu<sup><i>t</i></sup>)N(Ar)]BCl<sub>2</sub> (<b>1</b>), which can
be converted to the β-diketiminato boron dichloride HC[(CBu<sup><i>t</i></sup>)(NAr)]<sub>2</sub>BCl<sub>2</sub> (<b>2</b>) upon heating at 40 °C. Reaction of <b>1</b> with
the bulky lithium salts LiN(SiMe<sub>3</sub>)<sub>2</sub> and MesLi
(Mes = 2,4,6-Me<sub>3</sub>C<sub>6</sub>H<sub>2</sub>) resulted in
the cyclopropanation of the CBu<sup><i>t</i></sup> group
via the deprotonation of the methyl group, while reactions with PhLi
and LiNEt<sub>2</sub> gave substitution products
