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1. Attempts at generating metathesis-active Fe(IV) and Co(IV) complexes via the reactions of (silox)2M(THF)2, [(silox)3M][Na(THF)2] (M = Fe, Co), and related species with propellanes and triphenylboron

   Gregory M. George, Peter T. ( January 2022 , Polyhedron)

   Parkin, Ged (Ed.)

   Metathetical syntheses of (silox)2M(THF)2 (1-M, Fe, Co), [(silox)3M]Na(THF)2 (2-M, Fe, Co), and (silox)3Fe(THF) (3) are presented, as are X-ray structural studies of 1-Co, 2-Fe, and 2-Co. Exposure of these complexes to 1.1.1- propellane (111P, C5H6) and 1,3-dehydroadamantane (AdP), which are known progenitors of ROMP-active alkylidenes with ruthenium, failed to elicit similar reactivity. A total of 28 complexes were subjected to 111P in attempts to make “Fe(IV)” alkylidenes capable of some form of olefin metathesis with no success. At best, catalytic ring-opening to 3-exo-methylene cyclobutylidene was evidenced. The addition of triphenylboron as a Lewis acid failed to aid in metal complex formation of the propellanes, but an unusual rearrangement of AdP was noted. In addition, 2-Fe catalyzed the conversion of 111P to 3-exo-methylene cyclobutylidene, which added twice to Ph3B, affording a structurally characterized product, Ph(κ-CH=CMeCH2BPh 

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2. Rare Examples of Fe(IV) Alkyl-Imide Migratory Insertions: Impact of Fe—C Covalency in (Me 2 IPr)Fe(═NAd)R 2 (R = neo Pe, 1-nor)

   https://doi.org/10.1021/jacs.7b06960  

   Jacobs, Brian P. ; Wolczanski, Peter T. ; Jiang, Quan ; Cundari, Thomas R. ; MacMillan, Samantha N. ( August 2017 , Journal of the American Chemical Society)
3. Oxidative Additions to Ti(IV) in [(dadi) 4– ]Ti IV (THF) Involve Carbon–Carbon Bond Formation and Redox-Noninnocent Behavior

   https://doi.org/10.1021/acs.organomet.8b00930  

   Heins, Spencer P. ; Zhang, Bufan ; MacMillan, Samantha N. ; Cundari, Thomas R. ; Wolczanski, Peter T. ( March 2019 , Organometallics)
4. Investigation of Bridgehead Effects on Reduction Potential in Alkyl and Aryl Azadithiolate-Bridged (µ-SCH 2 XCH 2 S) [Fe(CO) 3 ] 2 Synthetic Analogues of [FeFe]-H 2 ase Active Site: Investigation of Bridgehead Effects on Reduction Potential in Alkyl and Aryl Azadithiolate-Bridged (µ-SCH2XCH2S) [Fe(CO)3]2 Synthetic Analogues of [Fe

   https://doi.org/10.1002/ejic.201800335  

   Rana, Atanu ; Kumar Das, Pradip ; Mondal, Biswajit ; Dey, Subal ; Crouthers, Danielle ; Dey, Abhishek ( August 2018 , European Journal of Inorganic Chemistry)
5. Sc 3+ -Promoted O–O Bond Cleavage of a (μ-1,2-Peroxo)diiron(III) Species Formed from an Iron(II) Precursor and O 2 to Generate a Complex with an Fe IV 2 (μ-O) 2 Core

   https://doi.org/10.1021/jacs.9b12081  

   Banerjee, Saikat ; Draksharapu, Apparao ; Crossland, Patrick M. ; Fan, Ruixi ; Guo, Yisong ; Swart, Marcel ; Que, Lawrence ( March 2020 , Journal of the American Chemical Society)