Labile Imidazolium Cyclopentadienides
Labile Imidazolium Cyclopentadienides
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不稳定的咪唑环戊二烯化物
DOI:
10.1021/acs.organomet.9b00589
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发表时间:
2019
期刊:
影响因子:
2.8
通讯作者:
Robinson, Gregory H.
中科院分区:
文献类型:
--
作者:
Wang, Yuzhong;Xie, Yaoming;Threlkeld, Holli L.;Wei, Pingrong;Schaefer, Henry F.;Robinson, Gregory H.
A series of imidazolium-based synthetic routes to imidazolium cyclopentadienides are reported. The 2:1 reaction of imidazolium (1) with [Cp2TiIIICl]2gives [NHCDippH]+[Cp2TiIIICl2]−(NHCDipp= 2,6-diisopropylphenyl-substituted N-heterocyclic carbene) (2). The “inverse sandwich” imidazolium cyclopentadienide (3) is obtained as a crystalline solid via reaction of1with both [Cp2TiIIICl]2and cyclopentadienyllithium (CpLi) (in a molar ratio of 2:1:1) in THF/toluene at elevated temperature. Notably, the 1:1 reaction of1with CpLi leads to the isolation of “multidecker”4in the solid state, while the corresponding 1:2 reaction of1with CpLi gives the crystals of CpLi-bound cyclopentadienyl-imidazolium complex5. While compounds3,4, and5have been structurally characterized using single-crystal X-ray diffraction, in solution these complexes dissociate due to the conversion of [NHCDippH]+[Cp]−to both cyclopentadiene and NHCDippthrough intramolecular proton transfer. The equilibrium of the acid–base conversion between [NHCDippH]+Cp–and the 1:1 mixture of NHCDippand cyclopentadiene is probed by theoretical methods.
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DOI:
10.1002/chin.199150264
发表时间:
1991
期刊:
ChemInform
影响因子:
--
作者:
R. Poli
通讯作者:
R. Poli
影响因子:
--
作者:
Jens Wessel;U. Behrens;E. Lork;R. Mews
通讯作者:
R. Mews
影响因子:
2.8
作者:
M. Swart
通讯作者:
M. Swart
DOI:
--
发表时间:
1968
期刊:
影响因子:
--
作者:
J.
通讯作者:
J.
影响因子:
2.3
作者:
Bischoff, Inga-Alexandra;Mueller, Carsten;Schaefer, Andre
通讯作者:
Schaefer, Andre