Synthesis of new chiral keto alcohols by baker’s yeast
作者:Tülay Yıldız、Nurgül Çanta、Ayşe Yusufoğlu
DOI:10.1016/j.tetasy.2014.01.003
日期:2014.2
Fourteen chiral α- and β-keto alcohols 2a–2r were synthesized by the asymmetric reduction of their corresponding diketones 1a–1r viabaker’s yeast. In addition, ten corresponding racemic α-keto alcohols were synthesized by the benzoin condensation of their corresponding aldehydes, which were used for the determination of the ee values through their chiral resolution on chiral HPLC. Amongst the 15 diketones
[EN] BIOREFINING COMPOUNDS AND ORGANOCATALYTIC UPGRADING METHODS<br/>[FR] BIORAFFINAGE DE COMPOSÉS ET PROCÉDÉS DE VALORISATION PAR ORGANOCATALYSE
申请人:CHEN EUGENE
公开号:WO2014008301A1
公开(公告)日:2014-01-09
The invention provides new methods for the direct umpolung self-condensation of 5-hydroxymethylfurfural (HMF) by organocatalysis, thereby upgrading the readily available substrate into 5,5'-di(hydroxymethyl) furoin (DHMF). While many efficient catalyst systems have been developed for conversion of plant biomass resources into HMF, the invention now provides methods to convert such nonfood biomass directly into DHMF by a simple process as described herein. The invention also provides highly effective new methods for upgrading other biomass furaldehydes and related compound to liquid fuels. The methods include the organocatalytic self-condensation (umpolung) of biomass furaldehydes into (C8-C12)furoin intermediates, followed by hydrogenation, etherification or esterification into oxygenated biodiesel, or hydrodeoxygenation by metal-acid tandem catalysis into premium hydrocarbon fuels.
Approaches to Open Fullerenes: Synthesis and Thermal Stability of <i>cis-1</i> Bis(isobenzofuran) Diels−Alder Adducts of C<sub>60</sub>
作者:Michael Sander、Thibaut Jarrosson、Shih-Ching Chuang、Saeed I. Khan、Yves Rubin
DOI:10.1021/jo061987b
日期:2007.4.1
bicyclic addends. The cis-1 bis(isobenzofuran) bisadducts 4b and 4e−j are kinetically far more stable toward thermal retro-Diels−Alder fragmentation than are mono(isobenzofuran) adducts of C60, in solution and in the solid state as determined by 1H NMR spectroscopy or thermogravimetric analysis. A methodology for the reversible solubilization of other fullerene derivatives based on this work is also presented
A series of seven symmetric difuryl-diynes were synthesized by a route delivering an anti-configurated product as the major product. The gold-catalyzed conversion of the individual anti- and syn-diastereomers was investigated. The anti-diastereomer in a desymmetrization reaction chemoselectively delivered dihydroindenediols with a furyl and a 2-oxopropyl side chain. The syn-diastereomer was completely converted into oligomeric/polymeric material. Thus, it was not necessary to separate the minor amount of the syn-diastereomers from the product mixtures in order to isolate the dihydroindenediols.
Synthesis and electrochemical capacitive performance of thieno[3,4-b]pyrazine-based Donor-Acceptor type copolymers used as supercapacitor electrode material
作者:Xiuping Ju、Lingqian Kong、Jinsheng Zhao、Guoyi Bai
DOI:10.1016/j.electacta.2017.04.011
日期:2017.6
PMOTP and PMTP. The obtained conjugated polymers were routinely characterized by FT-IR, SEM and TGA at first. Then, as supercapacitorelectrodematerials, they were further investigated in detail by cyclic voltammetry (CV), constant galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) methods The GCD results showed that the polymer-modified GCEs had high specific capacitances
以噻吩并[3,4-b]吡嗪(TPZ)为受体单元(A),以3-甲基噻吩或3-甲氧基噻吩为供体单元(D),合成了两种新型的供体-受体-供体型单体。所制备的DAD单体分别命名为MOTP和MTP。这两种单体可以通过恒电位法在玻璃碳电极(GCE)上轻松聚合,所得DAD替代共轭聚合物称为PMOTP和PMTP。首先,首先通过FT-IR,SEM和TGA对得到的共轭聚合物进行常规表征。然后,作为超级电容器电极材料,通过循环伏安法(CV)对其进行了进一步的详细研究,恒恒电流充放电(GCD)和电化学阻抗谱(EIS)方法GCD结果表明,聚合物改性的GCE在PMOTP和PMTP上的比电容分别为678.2和319.1 F / g。 1安/克。在电流密度为10 A / g的条件下进行1000次充放电循环后,两种聚合物修饰的GCE均具有出色的开关稳定性,PMOTP和PMTP的高保留率分别为77.3%和53.4%。值得注意