scholarly journals Nickel(ii)-catalyzed enantioselective cyclopropanation of 3-alkenyl-oxindoles with phenyliodonium ylide via free carbene

2016 ◽  
Vol 7 (4) ◽  
pp. 2717-2721 ◽  
Author(s):  
Jing Guo ◽  
Yangbin Liu ◽  
Xiangqiang Li ◽  
Xiaohua Liu ◽  
Lili Lin ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Epr Spectroscopy ◽  
Spectroscopy Study ◽  
Chiral Lewis Acid

A chiral Lewis acid-promoted cyclopropanation using a phenyliodonium ylide as the carbene precursor was developed. An EPR spectroscopy study supported a stepwise biradical mechanism.

Asymmetric synthesis of isoquinuclidines by Diels–Alder reaction of 1,2-dihydropyridine utilizing a chiral Lewis acid catalyst

Tetrahedron ◽  
2012 ◽  
Vol 68 (6) ◽  
pp. 1774-1781 ◽  
Author(s):  
Chigusa Seki ◽  
Masafumi Hirama ◽  
N.D.M. Romauli Hutabarat ◽  
Junko Takada ◽  
Chonticha Suttibut ◽  
...  
Keyword(s):  
Asymmetric Synthesis ◽  
Lewis Acid ◽  
Acid Catalyst ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction ◽  
Chiral Lewis Acid ◽  
Lewis Acid Catalyst

Chiral Lewis Acid Catalysis in Nitrile Oxide Cycloadditions

2004 ◽  
Vol 126 (17) ◽  
pp. 5366-5367 ◽  
Author(s):  
Mukund P. Sibi ◽  
Kennosuke Itoh ◽  
Craig P. Jasperse
Keyword(s):  
Lewis Acid ◽  
Acid Catalysis ◽  
Nitrile Oxide ◽  
Lewis Acid Catalysis ◽  
Chiral Lewis Acid

scholarly journals Synthesis, Resolution, and Aldol Reactions of a Planar-Chiral Lewis Acid Complex.

ChemInform ◽  
2006 ◽  
Vol 37 (12) ◽  
Author(s):  
Shih-Yuan Liu ◽  
Ivory D. Hills ◽  
Gregory C. Fu
Keyword(s):  
Lewis Acid ◽  
Aldol Reactions ◽  
Acid Complex ◽  
Chiral Lewis Acid

scholarly journals EPR Spectroscopy Study of the Radical Cation Cluster (η⁵-C₅H₅)(CO)₅ReFePt(μ₃-C=CHPh)(η²-Ph₂P(CH₂)₂PPh₂)

2019 ◽  
pp. 573-579
Author(s):  
Nikolay G. Maksimov ◽  
Victor V. Verpekin ◽  
Dmitry V. Zimonin ◽  
Galina V. Burmakina ◽  
Oleg S. Chudin ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Low Temperature ◽  
Radical Cation ◽  
Unpaired Electron ◽  
Iron Atom ◽  
Epr Spectroscopy ◽  
Binuclear Complex ◽  
Chemical Oxidation ◽  
Spectroscopy Study ◽  
Model Spectrum

The chemical oxidation of the cluster CpReFePt(μ3-C=CHPh)(CO)5(dppe) (Cp = η5-C5H5, dppe = η2- Ph2P(CH2)2PPh2) resulted in a radical cation [CpReFePt(μ3-C=CHPh)(CO)5(dppe)]+• that is sufficiently stable only at low temperature. An electronic structure of the radical cation was studied by EPR and following parameters were obtained by comparison of the experimental and model spectrum: gx = 2.070 gy = 2.0295 gz = 1.997; Ax(31P) = 17 Ay(31P) = 49 Az(31P) = 35 (Gs);Ax(195Pt) = 62 Ay(195Pt) = 45 Az(195Pt) = 105 (Gs). An unpaired electron is seen to be mainly concentrated on the iron atom (85-90%) and partially on the platinum atom (10-15%). Further transformation of the radical cation led to the formation of the binuclear complex Cp(CO)2RePt(μ-C=CHPh)(dppe) and the Fe-carbonyl fragment

Enantioselective 2-Alkylation of 3-Substituted Indoles with Dual Chiral Lewis Acid/Hydrogen-Bond-Mediated Catalyst

2016 ◽  
Vol 19 (1) ◽  
pp. 222-225 ◽  
Author(s):  
Zijun Zhou ◽  
Yanjun Li ◽  
Lei Gong ◽  
Eric Meggers
Keyword(s):  
Hydrogen Bond ◽  
Lewis Acid ◽  
Chiral Lewis Acid

Molecular Design of a Chiral Lewis Acid for the Asymmetric Claisen Rearrangement

1995 ◽  
Vol 117 (3) ◽  
pp. 1165-1166 ◽  
Author(s):  
Keiji Maruoka ◽  
Susumu Saito ◽  
Hisashi Yamamoto
Keyword(s):  
Lewis Acid ◽  
Claisen Rearrangement ◽  
Molecular Design ◽  
Chiral Lewis Acid
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