Scheme 4. Purified [H2BPPhH]n from the dehydrocoupling of H3B·PPhH2 catalysed by 1, 1 mol%. Inset (A) purified 2; (B) 11B{1H} NMR after 1 h: * H3B·PPhHBH2·PPhH22, † H3B·PPhH2, + H3B·PMe3, # short chain oligomers.
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