Cationic Tungsten Imido Alkylidene N‑Heterocyclic Carbene Complexes That Contain Bulky Ligands
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https://figshare.com/articles/dataset/Cationic_Tungsten_Imido_Alkylidene_N_Heterocyclic_Carbene_Complexes_That_Contain_Bulky_Ligands/16627945
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资源简介：
Neutral and cationic tungsten imido alkylidene
complexes of the
general formulas W(NtBu)(CHR1)(OR2)Cl(NHC), W(N-2,6-bis(2,4,6-tri-iPr-C6H4)phenyl)(CHR1)Cl2(NHC), [W(NtBu)(CHR1)(OR2)(NHC)][B(ArF)4] and [W(N-2,6-bis(2,4,6-tri-iPr-C6H4)phenyl)(CHR1)Cl(NHC)][B(ArF)4] (R1 = CMe3, CMe2Ph; R2 = sterically demanding alkoxide; B(ArF)4 = tetrakis(3,5-(CF3)2-C6H3)borate; NHC = N-heterocyclic carbene) were prepared.
Two electronically different NHCs, namely 1,3-dimethylimidazol-2-ylidene
(IMe) and 1,3-dimethyl-4,5-dichloroimidazol-2-ylidene (IMeCl), as
well as a variety of terphenolates and a chiral biphenolate were employed. Z-selective homometathesis (HM) of unfunctionalized olefins
was achieved with a selectivity of up to 90% and decent turnover numbers
(TON) of up to 480 in the HM of 1-dodecene. Additionally, the reactivity
of the cationic tungsten tert-butylimido complexes
in the reaction with vinyltrimethylsilane and ethylene was investigated,
which yielded the corresponding silyl-alkylidene complex and, for
the first time, a fully characterized cationic tungsten(IV) NHC ethylene
complex.
创建时间：
2021-09-16
