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Synthesis of Mn(III)X ₃ (X = Cl, Br, I) Compounds with Phosphine (R ₃ P) Ligands

https://doi.org/10.1021/acs.inorgchem.4c01820

Paul, Sanchita; Saju, Ananya; Cohen, Cooper; Crawley, Matthew R; MacMillan, Samantha N; Lacy, David C (August 2024, Inorganic Chemistry)

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Synthesis and Characterization of Dearomatized Pyridine‐Derived Alkyl‐Amido‐ tert ‐Butylphosphine Iron(II) Complexes

https://doi.org/10.1002/ejic.202300757

Gunasekera, Parami_S; Paul, Sanchita; MacMillan, Samantha_N; Lacy, David_C (February 2024, European Journal of Inorganic Chemistry)

Abstract Neutral three‐coordinate iron alkylidenes of the form PN−Fe=CHR have been proposed as viable candidates for alkene metathesis. Indeed, during the final stages of preparing this current study, a separate report disclosed that dearomatized PN−Fe‐alkyl complexes are active precatalysts for ring‐opening metathesis polymerization (ROMP) of norbornene implicating PN−Fe=CHR species as possible intermediates. In yet another separate report, we prepared Zn analogues of PN−Fe‐alkyl complexes and herein provide an account for the synthesis, characterization, and reactivity of some new iron complexes with the sametBu substituted PN platform.
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Hydrogenative Catalysis with Three‐Coordinate Zinc Complexes Supported with PN Ligands is Enhanced Compared to PNP Analogs

https://doi.org/10.1002/chem.202201042

Paul, Sanchita; Morgante, Pierpaolo; MacMillan, Samantha_N; Autschbach, Jochen; Lacy, David_C (May 2022, Chemistry – A European Journal)

Abstract This work details the synthesis, characterization, and catalytic activity of reactive low‐coordinate organozinc complexes. The complexes activate hydrogen and they appear to be more active in hydrogenation of ketones and imines than their tridentate pincer analogs. This is thought, in part, to be due to the lack of trailing third phosphorus arm present in previous work. DFT computations reveal a sigma‐bond metathesis mechanism is comparable to an alternative aromatization/dearomatization metal‐ligand cooperative mechanism.
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