Preparation of l -tryptophan imprinted microspheres based on carboxylic acid functionalized polystyrene

Dehydrogenative (Hetero)arene Alkoxylations Triggered by PdII‐Catalyzed C(sp2)–H Activation and Coordinating Substituent: PdII,III or PdIV Complex as Key Intermediate?

“…In 2015, the Cui/Wu team reported that neither the Pd(OAc) 2 /PhI(OAc) 2 nor the Pd(OAc) 2 /K 2 S 2 O 8 procedures allow alkoxylation of 1,2‐diaryldiazene oxides [Equation (51)] in the presence of TEMPO: hence their proposal of the formation of the alkoxy radical, and its addition to the dimeric Pd II chelate to afford a monomeric Pd III or Pd IV intermediate . This proposal, coupled with the ESI‐MS studies by Xu's team, led us to consider the catalytic cycle shown in Scheme for the Pd‐catalyzed dehydrogenative alkoxylation of arenes substituted with (H‐free nitrogen‐) coordinating groups…”

Magnetic molecularly imprinted polydopamine nanolayer on multiwalled carbon nanotubes surface for protein capture

“…Although the MIPs have a wide application prospect, the conventional MIPs preparation technique involving bulk polymerization and precipitation polymerization exhibited poor accessibility, low-affinity binding and high diffusion barrier because the recognition sites are embedded deeply in the polymers [4]. Fortunately, surface molecular imprinting technique provides an alternative way to overcome these drawbacks, which has built molecular recognition system on the supporting materials surface involving silica particles [5][6][7], magnetic nanoparticles [8,9], quantum dots (QDs) [10,11] and polystyrene nanoparticles [12].…”

Preparation of molecule imprinted membrane of single enantiomer of amino acid with an innovative strategy and study on its chiral recognition and resolution properties

“…This surface-initiating system produces a large amount of free radicals on the membrane surface, and so the formation of the surface-initiating system of -NH 2 /S 2 O 8 2− is a key factor in the preparation of the grafting type molecularly imprinted membrane. (2) In the aqueous solution at pH 4, because of the strong electrostatic interaction and hydrogen bonding, the molecules of the monomer DMAEMA will be automatically combined around L-Glu molecule as template to form a host-guest complex. (3) The radicals produced on the surface of AMPSF membrane initiate DMAEMA molecules around L-Glu molecules and the crosslinker MBA molecules to produce graft/crosslinking-polymerization, and at the same time, L-Glu molecules are enveloped into the crosslinked networks, forming a thin imprinted polymer layer.…”

“…Amino acids and their derivatives are chiral, and amino acid enantiomers show different physiological activities depending on their absolute configurations. Therefore, the chiral separation of amino acid enantiomers is of great importance and indispensable in life science fields and in various chemical industries dealing with pharmaceuticals, pesticides, food additives, cosmetics, and so on . Now, there are several chiral resolution methods, such as diastereomer crystallization, preferential crystallization, chemically kinetic resolution, enzymatic kinetic resolution, chromatography and membrane separation .…”

“…Therefore, the chiral separation of amino acid enantiomers is of great importance and indispensable in life science fields and in various chemical industries dealing with pharmaceuticals, pesticides, food additives, cosmetics, and so on . Now, there are several chiral resolution methods, such as diastereomer crystallization, preferential crystallization, chemically kinetic resolution, enzymatic kinetic resolution, chromatography and membrane separation . Among them, chiral separation with membranes is a promising method because membrane‐based processes are continuous, eco‐friendly, economical and are easy to scale up …”