FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1977448462> ?p ?o ?g. }

• W1977448462 endingPage "3211" @default.
• W1977448462 startingPage "3201" @default.
• W1977448462 abstract "A divalent chromium complex of bis(imino)pyridine, {2,6-[2,6-(i-Pr)2PhNC(CH3)]2(C5H3N)}CrCl2 (1), was prepared with the aim of studying its reactivity with alkylating agents. Upon treatment with MeLi, the metal center was both reduced and alkylated, forming {2,6-[2,6-(i-Pr)2PhNC(CH3)]2(C5H3N)}CrMe(μ-Me)Li(THF)3 (2). Complex 1 is also conveniently reduced with either NaH or metallic sodium to give the new species {2,6-[2,6-(i-Pr)2PhNC(CH3)]2(C5H3N)}CrCl (3). Despite the appearance of the metal center in a rare monovalent oxidation state, the square-planar geometry of the Cr atom suggests that the metal is most likely divalent, with the electron housed in the ligand π* orbital. When it is activated with MAO, complex 3 is a very and even more active catalyst for the polymerization of ethylene than either the −CrCl2 or −CrCl3 derivative of this ligand system and yet produces polymers with similar properties. Subsequent reactivity studies of complex 3 have allowed the isolation of several products. Reaction with either LiCH2Si(CH3)3 or MeLi resulted in deprotonation of one of the methyl groups on the ligand backbone, forming {2-[2,6-(i-Pr)2PhNC(CH3)]-6-[2,6-(i-Pr)2PhNCCH2](C5H3N)}Cr(THF) (4) and {2-[2,6-(i-Pr)2PhNC(CH3)]-6-[2,6-(i-Pr)2PhNCCH2](C5H3N)}Cr(μ-Me)Li(THF)3 (5), respectively. On the other hand, alkylation with AlMe3 allowed the successful preparation of another organochromium species, {2,6-[2,6-(i-Pr)2PhNC(CH3)]2(C5H3N)}CrCH3 (7), along with small amounts of the byproduct {2,6-[2,6-(i-Pr)2PhNC(CH3)]2(C5H3N)}Cr(μ-Cl)2Al(CH3)2 (6). Interestingly, complex 7, which also has the deceiving connectivity of a monovalent species, displays an even greater activity for ethylene polymerization than all of the other species reported herein, again producing a polymer with nearly identical characteristics. Activation with IBAO revealed a deactivation pathway similar to that observed with the FeCl2 system. In this case, the stronger reducing power of IBAO resulted in the usual reduction not only of the ligand backbone but also of the metal center. As a result of the metal reduction, partial transmetalation of the ligand system occurred, with formation of [η4-{2,6-[2,6-(i-Pr)2PhNC(CH3)]2(C5H3N)}Al2(i-Bu)3(μ-Cl)]Cr-(η6-C7H8) (8). By being catalytically inactive, the partly transmetalated 8 suggests that ligand demetalation is a possible catalyst deactivation pathway." @default.
• W1977448462 created "2016-06-24" @default.
• W1977448462 creator A5023309924 @default.
• W1977448462 creator A5033033868 @default.
• W1977448462 creator A5053584236 @default.
• W1977448462 creator A5063225492 @default.
• W1977448462 date "2007-05-18" @default.
• W1977448462 modified "2023-09-26" @default.
• W1977448462 title "Reactivity of Chromium Complexes of a Bis(imino)pyridine Ligand: Highly Active Ethylene Polymerization Catalysts Carrying the Metal in a Formally Low Oxidation State" @default.
• W1977448462 cites W1870330605 @default.
• W1977448462 cites W193670187 @default.
• W1977448462 cites W1963937984 @default.
• W1977448462 cites W1966061406 @default.
• W1977448462 cites W1968557268 @default.
• W1977448462 cites W1971981906 @default.
• W1977448462 cites W1983957119 @default.
• W1977448462 cites W1986119632 @default.
• W1977448462 cites W1987675653 @default.
• W1977448462 cites W1994382997 @default.
• W1977448462 cites W1997813847 @default.
• W1977448462 cites W2007122556 @default.
• W1977448462 cites W2016947237 @default.
• W1977448462 cites W2017239055 @default.
• W1977448462 cites W2018949339 @default.
• W1977448462 cites W2020616488 @default.
• W1977448462 cites W2020719760 @default.
• W1977448462 cites W2025561917 @default.
• W1977448462 cites W2034258039 @default.
• W1977448462 cites W2036665297 @default.
• W1977448462 cites W2036758586 @default.
• W1977448462 cites W2037785645 @default.
• W1977448462 cites W2037827010 @default.
• W1977448462 cites W2040569466 @default.
• W1977448462 cites W2040891107 @default.
• W1977448462 cites W2041043000 @default.
• W1977448462 cites W2045626338 @default.
• W1977448462 cites W2046471656 @default.
• W1977448462 cites W2049841356 @default.
• W1977448462 cites W2051326158 @default.
• W1977448462 cites W2054873826 @default.
• W1977448462 cites W2055441069 @default.
• W1977448462 cites W2056062327 @default.
• W1977448462 cites W2061128141 @default.
• W1977448462 cites W2064814454 @default.
• W1977448462 cites W2067662093 @default.
• W1977448462 cites W2067946377 @default.
• W1977448462 cites W2069211382 @default.
• W1977448462 cites W2069778813 @default.
• W1977448462 cites W2073540609 @default.
• W1977448462 cites W2075163421 @default.
• W1977448462 cites W2076469261 @default.
• W1977448462 cites W2077096033 @default.
• W1977448462 cites W2084194022 @default.
• W1977448462 cites W2084576763 @default.
• W1977448462 cites W2085841557 @default.
• W1977448462 cites W2086398347 @default.
• W1977448462 cites W2093954514 @default.
• W1977448462 cites W2093971882 @default.
• W1977448462 cites W2094687776 @default.
• W1977448462 cites W2101057616 @default.
• W1977448462 cites W2105249240 @default.
• W1977448462 cites W2114684164 @default.
• W1977448462 cites W2125125850 @default.
• W1977448462 cites W2125474243 @default.
• W1977448462 cites W2126494123 @default.
• W1977448462 cites W2127558285 @default.
• W1977448462 cites W2144332006 @default.
• W1977448462 cites W2145833868 @default.
• W1977448462 cites W2154672959 @default.
• W1977448462 cites W2164542929 @default.
• W1977448462 cites W2951269504 @default.
• W1977448462 cites W2952017358 @default.
• W1977448462 cites W4231958796 @default.
• W1977448462 doi "https://doi.org/10.1021/om0701423" @default.
• W1977448462 hasPublicationYear "2007" @default.
• W1977448462 type Work @default.
• W1977448462 sameAs 1977448462 @default.
• W1977448462 citedByCount "71" @default.
• W1977448462 countsByYear W19774484622012 @default.
• W1977448462 countsByYear W19774484622013 @default.
• W1977448462 countsByYear W19774484622014 @default.
• W1977448462 countsByYear W19774484622015 @default.
• W1977448462 countsByYear W19774484622016 @default.
• W1977448462 countsByYear W19774484622017 @default.
• W1977448462 countsByYear W19774484622018 @default.
• W1977448462 countsByYear W19774484622019 @default.
• W1977448462 countsByYear W19774484622020 @default.
• W1977448462 countsByYear W19774484622021 @default.
• W1977448462 countsByYear W19774484622022 @default.
• W1977448462 countsByYear W19774484622023 @default.
• W1977448462 crossrefType "journal-article" @default.
• W1977448462 hasAuthorship W1977448462A5023309924 @default.
• W1977448462 hasAuthorship W1977448462A5033033868 @default.
• W1977448462 hasAuthorship W1977448462A5053584236 @default.
• W1977448462 hasAuthorship W1977448462A5063225492 @default.
• W1977448462 hasConcept C116569031 @default.
• W1977448462 hasConcept C118629725 @default.
• W1977448462 hasConcept C142724271 @default.

• next