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Owing to the (Me3Si)3C group, the iminoborane 4 is stable for months at room temperature. The synthesis of 4 is achieved by reaction of the aminoborane 1 with tris(trimethylsilyl)methyllithium 2; the substitution product 3 eliminates Me3SiF above 60°C to give 4, which is polar according to its NMR spectrum.
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Haase et al. (1985) studied this question.
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