first cobalt‐catalyzed hydrogenative N‐methylation and alkylation of amines with readily available carboxylic acid feedstocks as alkylating agents and H2 as ideal reductant is described. Combination of tailor‐made triphos ligands with cobalt(II) tetrafluoroborate significantly improved the efficiency, thus promoting the reaction under milder conditions. This novel protocol allows for a broad substrate scope
PROCESS FOR PRODUCING (METH)ACRYLATES FROM GLYCEROL CARBONATE
申请人:BASF SE
公开号:US20200231528A1
公开(公告)日:2020-07-23
A process for preparing an ester of (meth)acrylic acid or a derivative thereof comprises reacting (meth)acrylic acid or a derivative thereof with glycerol carbonate at a reaction temperature of 10 to 150° C. without a solvent in the presence of at least one enzyme catalyzing the esterification reaction.
[EN] SILICA-BASED ZINC CATALYSTS. THEIR PREPARATION AND USE IN THE ALKOXYCARBONYLATION OF AMINES<br/>[FR] CATALYSEURS AU ZINC À BASE DE SILICE, LEUR PRÉPARATION ET LEUR UTILISATION DANS L'ALCOXYCARBONYLATION D'AMINES
申请人:COVESTRO DEUTSCHLAND AG
公开号:WO2018210711A1
公开(公告)日:2018-11-22
The present invention relates to silica-based heterogeneous zinc compounds which are suitable as catalysts in the reaction of amines with dialkyl carbonates to produce carbamates. The catalysts have the formula [SiO2]-CH2-CHR-X-COOZn[Y], wherein [SiO2] represents a silica carrier selected from the group consisting of ordered mesoporous silica and irregular amorphous narrow pore silica, R represents a moiety selected from the group consisting of hydrogen, -CH3, and -CH2CH3, preferably hydrogen, X is an aliphatic chain of 2 to 11 carbon atoms that optionally comprises ether moieties and [Y] represents a mono anion. The invention is also directed towards a method for the preparation of the aforementioned compounds and towards method for the alkoxycarbonylation of amines.
The invention relates to a process for preparing triaryl organoborates proceeding from organoboronic esters in the presence of an n-valent cation 1/n K
n+
, comprising the anhydrous workup of the reaction mixture and the use of the triaryl organoborates obtained as co-initiator in photopolymer formulations, holographic media and holograms.
Oxidation of α-hydroxy acids by an oxidation-active flavin mimic bearing a bipyridin-6-ylmethyl moiety in the presence of Zn<sup>2+</sup>and a base in tert-butyl alcohol
A benzo-dipteridine (BDP) having a bipyridin-6-ylmethyl moiety oxidizes α-hydroxy acids to give α-keto acids in the presence of Zn2+ and Et3N in ButOH, whereas a BDP bearing a bipyridin-5-ylmethyl moiety is unable to oxidize them under the same conditions; this is the first example of a D-lactate dehydrogenase model.