Oxidative Cleavage of Nitroalkenes with Hydrogen Peroxide in Environmentally Acceptable Solvents
作者:Olga Bortolini、Antonio De Nino、Marco Fogagnolo、Giancarlo Fantin、Loredana Mariuolo、Amedeo Tocci
DOI:10.1246/cl.2007.472
日期:2007.3.5
Hydrogen peroxide serves as an efficient oxidant for the nitroalkene C=C bond cleavage to aldehydes in ionic liquids.
过氧化氢作为氧化剂,在离子液体中有效促使硝基烯烃的C=C键断裂生成醛类。
Olefins oxidation with molecular O
<sub>2</sub>
in the presence of chiral Mn (III) salen complex supported on magnetic CoFe
<sub>2</sub>
O
<sub>4</sub>
@SiO
<sub>2</sub>
@CPTMS
作者:Kaveh Hemmat、Mohammad A. Nasseri、Ali Allahresani
DOI:10.1002/aoc.4937
日期:2019.7
magnetometer (VSM), scanning electron microscopy (SEM), powder X‐ray diffraction (XRD) and thermogravimetric analysis (TGA). Then, the aerobic enantioselective oxidation of olefins to the corresponding epoxide was investigated in the presence of magnetic chiral CoFe2O4@SiO2@Mn (III) complex at ambient conditions within 90 min. The results showed the corresponding products were synthesized with excellent
在本研究中,合成了CoFe 2 O 4 @SiO 2 @CPTMS纳米复合材料,并将均匀的手性Mn-salen复合物共价锚定在CoFe 2 O 4 @SiO 2 @CPTMS纳米复合材料的表面上。Mn-salen多相磁性纳米催化剂(CoFe 2 O 4 @SiO 2@ CPTMS @手性锰(III)配合物的特征在于不同的技术,包括透射电子显微镜(TEM),傅立叶变换红外(FT-IR),振动样品磁力计(VSM),扫描电子显微镜(SEM),粉末X射线衍射(XRD)和热重分析(TGA)。然后,在环境条件下在90分钟内在磁性手性CoFe 2 O 4 @SiO 2 @Mn(III)络合物的存在下研究了烯烃的好氧对映选择性氧化为相应的环氧化物。结果表明,合成的相应产物具有优异的收率和选择性。另外,非均相CoFe 2 O 4 @SiO 2CPTMS @手性Mn(III)配合物具有诸如与其均相类似物以及温
Mutant epoxide hydrolases
申请人:DSM N.V.
公开号:EP1013768A1
公开(公告)日:2000-06-28
Mutant epoxide hydrolases having an amino acid substitution of a tyrosine residue in the cap domain of the wild type epoxide hydrolase, in particular mutant epoxide hydrolases having an amino acid substitution of the tyrosine residue corresponding to Tyr152 or Tyr215 in an epoxide hydrolase with an aminoacid sequence according to SEQ ID No. 1. Preferably the Tyr is substituted by Phe. The invention also relates to nucleic acid sequences encoding such mutant epoxide hydrolases expression constructs wherein such nucleic acid sequence according is operably linked to a regulatory region capable of directing the expression of the mutant epoxide hydrolase in a suitable expression host, vectors capable of transforming a host cell characterized in that the vector containing such expression construct, transformed host cells transformed with such a vector, processes for the preparation of such mutant epoxide hydrolases and processes for the preparation of optically active epoxides and/or diols using such mutant epoxide hydrolases.
Mutant epoxide hydrolases having an amino acid substitution of a tyrosine residue in the cap domain of the wild type epoxide hydrolase, in particular mutant epoxide hydrolases having an amino acid substitution of the tyrosine residue corresponding to Tyr?152 or Tyr215¿ in an epoxide hydrolase with an aminoacid sequence according to SEQ ID No. 1. Preferably the Tyr is substituted by Phe. The invention also relates to nucleic acid sequences encoding such mutant epoxide hydrolases expression constructs wherein such nucleic acid sequence according is operably linked to a regulatory region capable of directing the expression of the mutant epoxide hydrolase in a suitable expression host, vectors capable of transforming a host cell characterized in that the vector containing such expression construct, transformed host cells transformed with such a vector, processes for the preparation of such mutant epoxide hydrolases and processes for the preparation of optically active epoxides and/or diols using such mutant epoxide hydrolases.