I presume he means to introduce the main recent achievements in the field of pincer chemistry of Groups 13–15 metals (B–In, Ge–Pb, and As–Bi). The main attention is given to the classical C-anionic van Koten’s type Y,C,Y-pincer ligands (Y=O, N), but related N-anionic N,N,N-pincer ligands derived from the pyrrole backbone are also mentioned :
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wow 46 years since someone last spoke to me about pincer chemistry - that's made me feel really old