Indirect electrooxidation of alcohols and aldehydes by using a double mediatory system consisting of ruthenium tetraoxide/ruthenium dioxide and chlorine cation/chlorine anion redoxes in an aqueous-organic two-phase system
Synthesis of tetrahydropyrans by hydroxyl participation in phenylthio migration
摘要:
Acid-catalysed cyclisation of substituted 1,6- or 1,4-alkane diols with suitably placed phenylthio groups leads to high yields of tetrahydropyrans formed by exo or endo hydroxyl participation during phenylthio migration with inversion at both the migration origin and terminus.
Catalytic Asymmetric Synthesis of Cyclohexanes by Hydrogen Borrowing Annulations
作者:Roly J. Armstrong、Wasim M. Akhtar、Tom A. Young、Fernanda Duarte、Timothy J. Donohoe
DOI:10.1002/anie.201907514
日期:2019.9.2
Hydrogen borrowing catalysis serves as a powerful alternative to enolate alkylation, enabling the direct coupling of ketones with unactivated alcohols. However, to date, methods that enable control over the absolute stereochemical outcome of such a process have remained elusive. Here we report a catalytic asymmetric method for the synthesis of enantioenriched cyclohexanes from 1,5‐diols via hydrogen
The ability of horseliveralcoholdehydrogenase (HLADH) to the enantioselective oxidation of primary–primary, primary–secondary and primary-tertiary aliphatic 1,5- and 1,6-diols 1a–i was studied. No enantioselectivity of the transformations of primary–primary 1,6-diols 1a–d to ɛ-lactones 4a–d was observed. Regioselective oxidation of primary–secondary 1,6-diols 1e,f and 1,5-diols 1h,i afforded enantiomerically
Schnelltrocknende, hart-elastische, kratzfeste und beständige Beschichtungsmassen
申请人:BASF SE
公开号:EP2808354A1
公开(公告)日:2014-12-03
Die vorliegende Erfindung betrifft schnelltrocknende, hart-elastische, kratzfeste und beständige zweikomponentige Polyurethanbeschichtungsmassen, deren Verwendung und Verfahren zum Beschichten. Die Beschichtungsmassen enthalten als Aufbaukomponenten Polyisocyanat, hydroxygruppenhaltiges Poly(meth)acrylatpolyol, und bestimmte verzweigte Polyesterpolyole, erhältlich durch Polykondensation von Hexahydrophthalsäureanhydrid, Trimethylolpropan, und optional weiteren Komponenten.
Provided is an adhesive which, in a metal foil-containing laminated composite film used in a high temperature sterilization treatment, is resistant to the effects of moisture in the air during curing, has good workability when used as a solvent-free adhesive, and exhibits excellent adhesive strength and acid resistance. Provided is a method for producing an adhesive composition, the method including: a step of obtaining an alcohol-added isocyanate (E) by reacting a trifunctional or higher isocyanate compound (C2) and a monofunctional alcohol compound (D) at an equivalence ratio of isocyanate groups in the trifunctional or higher isocyanate compound (C2) : monofunctional alcohol (D) = 100 mol% : 25 to 65 mol%, and a step of mixing a polyisocyanate (A) containing a trifunctional or higher polyisocyanate (C1) and the alcohol-added isocyanate (E), and an alcohol (B) having an acid value of 0.5 to 30 mgKOH/g, so that the equivalence ratio between isocyanate groups in the polyisocyanate (A) and hydroxyl groups in the alcohol (B) (isocyanate groups/hydroxyl groups) is within a range from 0.7 to 2.5.
ORGANIC SOLVENT-BASED PRINTING INK HAVING SEPARABILITY, PRINTED MATERIAL, LAMINATE BODY, AND RECYCLED BASE MATERIAL MANUFACTURING METHOD
申请人:Toyo Ink SC Holdings Co., Ltd.
公开号:EP3892694A1
公开(公告)日:2021-10-13
An organic solvent-based printing ink used in forming a detachable layer to enable recycling of a substrate 1 by separating a picture layer and/or a substrate 2 from a printed item or a laminated body having the substrate 1, the detachable layer, and the picture layer and/or the substrate 2 in that order, wherein
the organic solvent-based printing ink contains a polyurethane resin with an acid value of 15 to 70 mgKOH/g as a binder resin.