112549-07-2Relevant academic research and scientific papers
Low-spin 1,1′-diphosphametallocenates of chromium and iron
Greer, Samuel M.,üngor, ?kten,Beattie, Ross J.,Kiplinger, Jaqueline L.,Scott, Brian L.,Stein, Benjamin W.,Goodwin, Conrad A. P.
supporting information, p. 595 - 598 (2021/01/29)
We report two anionic diphosphametallocenates, [K(2.2.2-crypt)][M(PC4Me4)2] (M = Cr, 2-Cr; Fe, 2-Fe). Both are low-spin (S = ?) by EPR spectroscopy and SQUID magnetometry. This contrasts the high-spin (S = ) ferrocenate, [K(2.2.2-crypt)][Fe(C5H2-1,2,4-tBu)2] (4-Fe). Quantum chemical calculations suggest this is due to significant differences in ligand field splitting of the d-orbitals which also explain structural features in the 2-M complexes. This journal is
Evidence for Iron-Catalyzed α-Phosphinidene Elimination with Phenylphosphine
Pagano, Justin K.,Ackley, Brandon J.,Waterman, Rory
, p. 2554 - 2557 (2018/02/27)
The ubiquitous half-sandwich iron complex [CpFe(CO)2Me] (Cp=η5-C5H5) appears to be a catalyst for α-phosphinidene elimination from primary phosphines. Dehydrocoupling reactions provided initial insight into this unusual reaction mechanism, and trapping reactions with organic substrates gave products consistent with an α elimination mechanism, including a rare example of a three-component reaction. The substrate scope of this reaction is consistent with generation of a triplet phosphinidene. In all, this study presents catalytic phosphinidene transfer to unsaturated organic substrates.
π-complex compounds
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, (2008/06/13)
π-complex compounds and in particular metallocene compounds of formula (Ia)(Ib), in which πI and πII represent π-systems, D designates a donor atom and A designates an acceptor atom, D and A being linked by a reversible coordinative bond such that the donor group assumes a positive (partial) charge and the acceptor group assumes a negative (partial) charge, at least one of D and A being part of the associated π-system in each case, M stands for a transition metal of the 3rd, 4th, 5th or 6th subgroup of the (Mendelian) periodic system of elements, X designates an anion equivalent and n designates the number zero, one, two three or four depending on the charges of M and those of πI and πII, are novel and can be used as catalysts for the (co)polymerization of olefins, i-olefins, alkines and/or diolefins or for ring-opening polyaddition.
Metallacycle transfer from zirconium to main group elements: A versatile synthesis of heterocycles
Fagan, Paul J.,Nugent, William A.,Calabrese, Joseph C.
, p. 1880 - 1889 (2007/10/02)
The reaction of zirconium metallacycles is used to produce a variety of main group heterocycles including borole Diels-Alder dimers, galloles, indacyclopentadienes, siloles, germoles, stannoles, phospholes, arsoles, stiboles, bismoles, thiophenes, selenophenes, dihydrothiophenes, dihydroselenophenes, tetrahydrothiophenes, tetrahydro-selenophenes, stannacyclopentanes, phospholenes, and isothiazoles. An X-ray crytallographic study of the borole DielsAlder dimer of 1-phenyl-2,3,4,5-tetramethylborole is discussed and compared with the structure of 7-norbornenyl carbenium ions. The scope and potential for this metallacycle transfer reaction are delineated.
