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1. Polymorphism in 9-[(9 H -Fluoren-9-ylidene)methyl]phenanthrene

   https://doi.org/10.1021/acs.cgd.2c00120  

   Roth, Alexander D.; Thamattoor, Dasan M. (August 2022, Crystal Growth & Design)
2. Allylic C–H functionalization via group 9 π-allyl intermediates

   https://doi.org/10.1039/D0DT02313B  

   Nelson, Taylor A.; Hollerbach, Michael R.; Blakey, Simon B. (October 2020, Dalton Transactions)

   null (Ed.)

   Allylic C–H functionalization catalysed by group 9 Cp* transition-metal complexes has recently gained significant attention. These reactions have expanded allylic C–H functionalization to include di- and trisubstituted olefins, and a broad range of coupling partners. More specifically, several catalytic C–N, C–O, and C–C bond forming allylic C–H functionalization reactions have been reported, proceeding via MCp*-π-allyl intermediates. Herein we present an overview of these reactions by mechanistic paradigm. We also place this information in context of recent advances, as well as, limitations that remain for this class of reactions. 

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3. Successive carbene insertion into 9-phenyl-9-borafluorene

   https://doi.org/10.1039/c9dt01032g  

   Bartholome, Tyler A.; Bluer, Kristen R.; Martin, Caleb D. (May 2019, Dalton Transactions)

   The reactions of 9-phenyl-9-borafluorene with trimethylsilyldiazomethane in a 1 : 1 and 1 : 2 stoichiometry furnished the corresponding BC 5 and BC 6 heterocycles via the formal insertion of one and two carbene units. 

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4. Coherent Vibrational Dynamics of Au ₁₄₄ (SC ₈ H ₉ ) ₆₀ Nanoclusters

   https://doi.org/10.1021/acs.jpclett.3c01477  

   Jeffries, William R.; Malola, Sami; Tofanelli, Marcus A.; Ackerson, Christopher J.; Häkkinen, Hannu; Knappenberger, Kenneth L. (July 2023, The Journal of Physical Chemistry Letters)
5. The 9‐Borataphenanthrene Anion

   https://doi.org/10.1002/anie.202002125  

   Bartholome, Tyler A.; Kaur, Aishvaryadeep; Wilson, David J. D.; Dutton, Jason L.; Martin, Caleb D. (May 2020, Angewandte Chemie International Edition)

   Abstract The 9‐borataphenanthrene anion is easily accessed by deprotonation of a 9,10‐dihydro‐9‐boraphenanthrene and its diverse reactivity is investigated. Alkylation occurs at the carbon atom adjacent to boron, and room temperature hydroboration occurs across the B=C bond. The π‐manifold of the central BC₅ring coordinates to chromium in an η⁶fashion while only the B=C unit binds η²to gold, indicating versatility of the 9‐borataphenanthrene anion as a ligand. Supporting calculations rationalize the reactivity and aromaticity is corroborated by nucleus‐independent chemical shift (NICS) indices. 

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