[2 + 2]‐Cycloaddition Products from lminoborane and Iminophosphane The iminoborane BuBNtBu (1a) and the iminophosphanes R2NPNR′ (2a, b) undergo a cyclisation to the corresponding 1,3,2,4‐diazaphosphaboretidines (3a, b).
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Paetzold et al. (1983) studied this question.
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