Variable and efficient synthesis of new tetra-substituted pentalenide ligands Niko Jenek, Ulrich Hintermair 1 University of Bath, UK 2- ; Pn 2- ) have attracted interest in organometallic transition metal chemistry due to their unique coordination properties like the ability of folding around the metal centre and a variety of bonding modes ( η 1 ; η 3 ; η 5 ; η 8 ) paired with ring slippage. 1 Mono- and bimetallic d-block pentalenide complexes have thus found applications in small molecule activation and polymerisation catalysis. 1 However, due to the difficulty of synthesising suitable precursors, organometallic pentalenide chemistry has been confined to three ligands ( [1,4-SiMe 3 ] 2 Pn 2- , [1,4-Si i Pr 3 ] 2 Pn 2- and Me 6 Pn 2- ) over the past 25 years. 2 Here we present mild solution phase syntheses that expand our recently reported method 3 for synthesizing Ph 4 Pn 2- with the aim of widening the field of organometallic pentalenide chemistry substantially by making the synthesis of tailored pentalenide ligands more accessible. Pentalenide ligands (parent framework C 8 H 6
Figure 1: Pn 2- synthesis approaches with advantages (green) and limitations (red). a) (1,4-SiR 3 ) 2 Pn
2- synthesis, b)
Me 6 Pn
2- synthesis and c) work presented here.
References 1. Cloke, F. G. N.; Green, J. C.; Kilpatrick, A. F. R.; O'Hare, D.; Chem. Rev. 2017 , 344 , 238-262. 2. Boyt, S. M.; Jenek, N. A.; Hintermair, U.; Dalton Trans. 2019 , 48 , 5107-5124. 3. Boyt, S. M.; Jenek, N. A.; Sanderson, H. J.; Kociok-Köhn, G.; Hintermair, U.; Organometallics 2022 , 41 , 211-225.
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© The Author(s), 2022
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