(Iminoboryl)borates [(Me3CN.tplbond.B)B(CMe3)2R]- from azadiboriridine NB2(CMe3)3 (R = Me, Bu).
Ring-opening reaction of azadiboriridine I (R = CMe3) with LiR1 (R1 = Me, Bu) in THF in the presence of Me2NCH2CH2NMe2 (tmeda) gave [Li(tmeda)2][R1(Me3C)2BB.tplbond.NCMe3] (II). The crystal structure of II (R = Bu) was detd. Thermolysis of Cl(Me3C)B:N(Mes)SiMe3 (Mes = mesityl) gave Me3CB.tplbond.N(Mes) which on condensation with Me3CBCl2 followed by dechlorination with lithium gave I (R = Mes) which was characterized by crystal structure detn.
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