New Journal of Chemistry published new progress about 258278-25-0. 258278-25-0 belongs to imidazoles-derivatives, auxiliary class Achiral NHCs Ligands, name is 1,3-Bis(2,6-diisopropylphenyl)-4,5-dihydro-1H-imidazol-3-ium chloride, and the molecular formula is C27H39ClN2, Synthetic Route of 258278-25-0.
Cruz, Thais R. published the artcileNew dmso-ruthenium catalysts bearing N-heterocyclic carbene ligands for the ring-opening metathesis of norbornene, Synthetic Route of 258278-25-0, the publication is New Journal of Chemistry (2019), 43(16), 6220-6227, database is CAplus.
Novel DMSO Ru(II) complexes of N-heterocyclic carbenes [RuCl2(S-DMSO)2(SIMes)] (1), [RuCl2(S-DMSO)2(IMes)], (2) [RuCl2(S-DMSO)2(SIDip)] (3), and [RuCl2(S-DMSO)2(IDip)] (4) were successfully synthesized. The complexes 1–4 were characterized by elemental anal., FTIR, UV-visible, 1H and 13C NMR, and computational studies. The polynorbornene (polyNBE) syntheses via ROMP using the complexes 1–4 as pre-catalysts in the presence of Et diazoacetate (EDA) were evaluated under different [EDA]/[Ru] and [NBE]/[Ru] ratios, temperatures (25 and 50°) and times (5-60 min). Quant. yields of polyNBEs using [NBE]/[EDA]/[Ru] = 5000/28/1 for 10 min at 25° were obtained. The order of magnitude of 105 g mol-1 for Mn and PDI values ranging from 1.2 to 3.5 were measured by SEC. A study combining exptl. data and computational calculations was performed to elucidate the mechanism of ROMP of NBE mediated by the complexes 1–4 as pre-catalysts. The proposed mechanism suggests the occurrence of a dissociative reaction of the complexes 1–4, losing a DMSO ligand as the 1st step, resulting in a 14-electron species, which reacts with EDA to form the metal-carbene, followed by discoordination of the 2nd DMSO mol. for coordination of NBE.
New Journal of Chemistry published new progress about 258278-25-0. 258278-25-0 belongs to imidazoles-derivatives, auxiliary class Achiral NHCs Ligands, name is 1,3-Bis(2,6-diisopropylphenyl)-4,5-dihydro-1H-imidazol-3-ium chloride, and the molecular formula is C27H39ClN2, Synthetic Route of 258278-25-0.
Referemce:
https://en.wikipedia.org/wiki/Imidazole,
Imidazole | C3H4N2 – PubChem