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• W4310479965 abstract "Abstract A series of cationic tungsten sulfido alkylidene N ‐heterocyclic carbene (NHC) complexes ( W01 – W09 ) of the general formula [W(S)(CHCMe 3 )(X)(NHC)(CMe 3 CN) + B(Ar F ) 4 − ] (NHC = 1,3‐dimesitylimidazol‐2‐ylidene, IMes; 1,3‐dimesityl‐4,5‐dichloroimidazol‐2‐ylidene, IMesCl 2 ; 1,3‐bis(2,6‐xdiisopropyl)phenyl)imidazol‐2‐ylidene, IDipp; X = Cl, C 6 F 5 O, 2,6‐Ph 2 ‐C 6 H 3 ; B(Ar F ) 4 − = tetrakis(3,5‐bis(trifluoromethyl)phenyl)borate) are used as initiators in the stereoselective ring‐opening metathesis polymerization (ROMP) of (+) 2,3‐ endo, exo ‐dicarbomethoxynorborn‐5‐ene ((+)DCMNBE, M1 ). Trans ‐isospecifity up to 84% is achieved along with varying percentages of cis ‐syndiospecifity. The different extent of trans ‐isospecifity is compared to the one of related benchmark cationic molybdenum and tungsten imido and tungsten oxo alkylidene NHC complexes. Mechanistic investigations suggest that the syn ‐isomer of a nitrile‐free initiator reacts with M1 presumably in an ene anti fashion to yield a syn ‐first insertion product via turnstile rearrangement, which accounts for the predominant trans ‐isospecifity of the polymerization. The cis ‐syndiotactic sequences are proposed to stem from the competing ene syn addition of M1 to a nitrile‐containing syn ‐isomer of the initiator." @default.
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• W4310479965 date "2022-12-08" @default.
• W4310479965 modified "2023-09-30" @default.
• W4310479965 title "Stereoselective Ring‐Opening Metathesis Polymerization with Tungsten Sulfido Alkylidene <i>N</i>‐Heterocyclic Carbene Complexes" @default.
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• W4310479965 doi "https://doi.org/10.1002/macp.202200350" @default.
• W4310479965 hasPublicationYear "2022" @default.
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