Photoenzymatic Hydrogenation of Heteroaromatic Olefins Using ‘Ene’‐Reductases with Photoredox Catalysts
作者:Yuji Nakano、Michael J. Black、Andrew J. Meichan、Braddock A. Sandoval、Megan M. Chung、Kyle F. Biegasiewicz、Tianyu Zhu、Todd K. Hyster
DOI:10.1002/anie.202003125
日期:2020.6.22
selective catalysts for the asymmetric reduction of activated alkenes. This function is, however, limited to enones, enoates, and nitroalkenes using the native hydride transfer mechanism. Here we demonstrate that EREDs can reduce vinyl pyridines when irradiated with visible light in the presence of a photoredoxcatalyst. Experimental evidence suggests the reaction proceeds via a radical mechanism where
Ligand coupling through σ-sulfurane — complete retention of configuration of 1-phenylethyl group in the reaction of 1-phenylethyl 2-pyridyl sulfoxide with grignard reagent1
作者:Shigeru Oae、Tsutomu Kawai、Naomichi Furukawa
DOI:10.1016/s0040-4039(01)91150-5
日期:1984.1
The reaction of benzyl or 1-phenylethyl 2-pyridyl sulfoxide with Grignard reagent proceeds via a σ-sulfurane as an intermediate to give the coupling product, 2-benzylpyridine or 2-(1-phenylethyl)pyridine in quantitative yield. Stereochemistry for this reaction is complete retention at the benzylic carbon atom.
DiPAMPâs Big Brother â<i>i-</i>Pr-SMS-Phosâ Exhibits Exceptional Features Enhancing Rhodium(I)-Catalyzed Hydrogenation of Olefins
作者:Michel Stephan、Damjan SÌterk、Barbara Mohar
DOI:10.1002/adsc.200900621
日期:2009.11
Switching Knowles DiPAMP’s DiPAMP=1,2-bis[(o-anisyl)(phenyl)phosphino]-ethane} MeO groups with i-PrO ones led to the i-Pr-SMS-Phos i-Pr-SMS-Phos=1,2-bis[(o-isoprop- oxyphenyl)(phenyl)phosphino]ethane} ligand which displayed a boosted catalyst activity coupled with an enhanced enantioselectivity in the rhodium(I)-catalyzed hydrogenation of a wide-range of representative olefinic substrates (dehydro-α-amido
The invention provides compounds having the general formula I:
and pharmaceutically acceptable salts thereof, wherein the variables R
A
, R
AA
, subscript n, ring A, X
2
, L, subscript m, X
1
, R
1
, R
2
, R
3
, R
4
, R
5
, and R
N
have the meaning as described herein, and compositions containing such compounds and methods for using such compounds and compactions.
LIQUID CRYSTAL CURED FILM AND METHOD FOR MANUFACTURING SAME
申请人:Zeon Corporation
公开号:EP3605168A1
公开(公告)日:2020-02-05
A method for producing a liquid crystal cured film including a liquid crystal cured layer formed of a cured product of a liquid crystal composition including a liquid crystal compound capable of expressing a birefringence with reverse wavelength distribution and a polymerization initiator, the method including: a step of forming a layer of the liquid crystal composition; a step of giving orientation to the liquid crystal compound contained in the layer of the liquid crystal composition; and a step of curing the layer of the liquid crystal composition, wherein a residue content viscosity of a test composition is 800 cP or less under a condition of a temperature that is the same as a temperature of the layer in the step of giving orientation to the liquid crystal compound, the test composition being the liquid crystal composition from which the polymerization initiator is omitted.