139220-25-0Relevant articles and documents
Dipyrrolyl precursors to bisalkoxide molybdenum olefin metathesis catalysts
Hock,Schrock, Richard R.,Hoveyda, Amir H.
, p. 16373 - 16375 (2006)
Addition of 2 equiv of lithium pyrrolide to Mo(NR)(CHCMe 2R′)(OTf)2(DME) (OTf = OSO2CF 3; R = 2,6-i-Pr2C6H3, 1-adamantyl, or 2,6-Br2-4-MeC6H2; R′ = Me or Ph) produces Mo(NR)(CHCMe2R′)(NC4H4) 2 complexes in good yield. All compounds can be recrystallized readily from toluene or mixtures of pentane and ether and are sensitive to air and moisture. An X-ray structure of a 2,6-diisopropylphenylimido species shows it to be an unsymmetric dimer, {Mo(NAr)(syn-CHCMe2Ph) (η5-NC4H4)(η1-NC 4H4)}{Mo(NAr)(syn-CHCMe2Ph)(η1- NC4H4)2}, in which the nitrogen in the η5-pyrrolyl bound to one Mo behaves as a donor to the other Mo. All complexes are fluxional on the NMR time scale at room temperature, with one symmetric species being observed on the NMR time scale at 50 °C in toluene-d8. The dimers react with PMe3 (at Mo) or B(C 6F5)3 (at a η5-NC 4H4 nitrogen) to give monomeric products in high yield. They also react rapidly with 2 equiv of monoalcohols (e.g., Me3COH or (CF3)2MeCOH) or 1 equiv of a biphenol or binaphthol to give 2 equiv of pyrrole and bisalkoxide or diolate complexes in ～100% yield.
PROCESS FOR PRODUCING ORGANIC TRANSITION METAL COMPLEX COMPOUND, METATHESIS CATALYST PRODUCED BY THE PROCESS, METATHESIS POLYMER FORMED BY RING OPENING POLYMERIZATION WITH THE SAME, AND PROCESS FOR PRODUCING POLYMER WITH THE SAME
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Page/Page column 21, (2008/12/07)
A process for synthesizing an organic transition metal complex compound with an atom group having an electron-donor ability, in an industrially and economically advantageous manner, without a compound having a proton-donor ability being a metal salt, and a metathesis catalyst produced with the use of the above process, are provided. A process for producing an organic transition metal complex compound in which an atom group having an electron-withdrawing ability can be converted into an atom group having a stronger electron-donor ability, by contacting an compound having a proton-donor ability with the organic transition metal complex compound with an atom group having an electron-withdrawing ability, in the presence of an basic compound, and a metathesis catalyst of which the content of an alkali metal is reduced, and which is obtainable with the use of the above process, are provided.
Rate of interconversion of syn and anti rotamers of Mo(CHCMe2Ph)(NAr)(OR)2 and relative reactivity toward 2,3-bis(trifluoromethyl)norbornadiene
Oskam, John H.,Schrock, Richard R.
, p. 7588 - 7590 (2008/10/08)
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