The simplest boron compounds 1 with aromatic character have now been isolated in quantitative crude yields via a one-step synthesis. In the case of 1a, R tBu, and 1b, R SnMe3, the cyclic delocalization of the two π-electrons was detected NMR spectroscopically. The B atom is very strongly shielded, while the C atoms in the ring are noticeabley deshielded.
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Pues et al. (1984) studied this question.
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