A new strategy based on polymerization-induced phase separation (PIPS) techniques was proposed for fabricating palladium nanoparticles (PdNPs) captured in a microporous network polymer. Pd(OAc)(2) premixed with monomer having poly(amidoamine)-based dendrimer ligand, and subsequently this thermally polymerized an excess amount of ethylene glycol dimethacrylate under PIPS conditions. In system, the formation PdNPs occurred concurrently polymer synthesis one-pot process, even no additional...

A time economical 60 min total synthesis of (−)-oseltamivir was accomplished in a single reaction vessel over five steps. One the key issues is reduction number steps by eliminating lengthy with substitution rapid epimerization step. catalytic system consisting three reagents, namely, diphenylprolinol silyl ether, thiourea, and acid, developed for asymmetric Michael excellent diastereo- enantioselectivities. All reactions were optimized terms not only yield selectivity but also time.

A 5,10,15,20-tetra(4-pyridyl)porphyrin (TPyP)-deposited ITO electrode as a sensor of nucleotides using photocurrent change was prepared. The TPyP-deposited could repeatedly detect having concentrations the μM order by decrease in photocurrent.

Various supramolecular nanotubes have recently been built up by lipids, peptides, and other organic molecules. Major light-harvesting (LH) antenna systems in a filamentous anoxygenic phototroph, Chloroflexus (Cfl.) aurantiacus, are called chlorosomes contain photofunctional single-wall with approximately 5 nm their diameter. Chlorosomal of Cfl. aurantiacus constructed large amount bacteriochlorophyll(BChl)-c Such pigment self-assembles chlorosome without any assistance from the which is...

A continuous-flow synthesis of (–)-oseltamivir composed five flow units was accomplished. In each unit, the following reactions proceed efficiently: (1) a diphenylprolinol silyl ether mediated Michael reaction, (2) domino reaction and intermolecular Horner–Wadsworth–Emmons reactions, (3) protonation, (4) epimerization, (5) reduction nitro group to an amine. (–)-Oseltamivir obtained in 13% total yield through single with residence time 310 minutes.

This paper reports on fabrication of water-compatible palladium nanoparticle (PdNP) catalysts supported microporous polymers, which show high activity and extremely low Pd leaching behaviour in the usage for carbon cross-coupling reactions. The PdNP were fabricated by utilizing polymerization-induced phase separation (PIPS) method. An outstanding point present study is to use a small molecule ligand monomer (D-m) based N,N-dimethyl ethylenediamine, instead PAMAM dendrimer-based used...

In this study, we used PAMAM dendrimers (G1−G4) as stationary phases to deposit porphyrin-intercalated DNA onto ITO electrodes. The surface density of the external amino moieties dendrimers, i.e., cationic charge on surface, increased with each generation, and correspondingly coverage porphyrin (1) units through electrostatic interactions intercalation. resulting dendrimer−DNA−1 membranes were sufficiently stable that they did not peel off electrodes generated photocurrent waves in response...

The asymmetric Diels-Alder reaction of α-substituted acrolein proceeds in the presence trifluoroacetic acid salt trifluoromethyl-substituted diarylprolinol silyl ether to afford exo-isomer with both excellent diastereoselectivity and high enantioselectivity. In a β,β-disubstituted α,β-unsaturated aldehyde, good exo-selectivity enantioselectivity was obtained when perchloric bulky triisopropyl trifluoromethyl substituted employed as an organocatalyst water. cases, all-carbon quaternary...

Pheophytin(Pheo)‐ a as the free base of chlorophyll(Chl)‐ , was fluorinated at 20‐position using N ‐fluorobenzenesulfonimide, followed by insertion magnesium cation central position to afford 20‐fluoro‐Chl‐ . On other hand, 3 2 ,3 ‐difluoro‐Chl‐ obtained from Pheo‐ d possessing 3‐formyl group Wittig reaction (triphenylphosphonio)difluoroacetate and successive insertion. The synthetic 20‐fluoro‐ ‐difluoro‐Chls‐ showed similar optical properties enzymatic hydrolysis phytyl ester original...

A variety of N-containing heteroarenes were site-selectively introduced at the C31-position a chlorophyll-a derivative possessing 3-vinyl group through C-N+ bond via oxidative reactions using iodine in presence silver(i) salt. Electron-rich N-heteroarenes effectively substituted, while electron-withdrawing or bulky nitrogen-neighboring substituents suppressed reactivities. The cationic products formed characterized by 1D/2D NMR, and their optical properties also investigated.

Since photochemical CO2 reduction using long wavelength regions of sunlight is important, we have reported the first with red visible light (>650 nm) by a syntheti...

This Article reports on the ligand integration effect of poly(amidoamine) (PAMAM) dendrimers working in solid composite systems, which is significant for stabilizing Pd nanoparticles (PdNPs). To carry forward this research, fourth generation PAMAM dendrimer (G4) was modified with polymerizable functions and tied to polymer networks constituting porous composites through polymerization-induced phase separation (PIPS) strategy. The obtained results indicate that creation PdNPs strongly...

We have used titania nanoparticles (TiO2) to establish a facile preparation of highly photoresponsible membrane. An improved photocurrent generator was prepared easily using spin coating Nafion/porphyrin/TiO2 mixture on an indium−tin−oxide substrate. Generated density about 10 times higher than that in the absence TiO2. The resultant electrode shows distinct generation despite impediments derived from high dye-concentration (i.e., self-quenching photoexcited states) and membrane thickness...

Fine‐tuning the electronic absorption properties of chlorophylls is important for their use as light‐absorbing pigments. By oxidative coupling, a cationic pyridinium group was selectively introduced at peripheral vinyl three types synthetic with different degrees π‐conjugation cyclic tetrapyrroles (bacteriochlorin, chlorin, and porphyrin). The substitution electron‐withdrawing moved redmost main fluorescence emission maxima to longer wavelengths. This effect depended on core π‐system...

The development of human milk fat substitutes (HMFSs), rich in palmitic acid (16:0) at the sn-2 position triacylglycerol (TAG) and unsaturated fatty acids (FAs) (oleic acid, 18:1 linoleic 18:2) sn-1(3) positions, has gained popularity. In this study, HMFSs containing polyunsaturated (PUFAs) predominantly were prepared, their oxidation stabilities compared. First, a non-PUFA-containing HMFS (NP-HMFS) was produced by enzymatic reactions using Novozyme® 435 Lipozyme® RM-IM as enzymes lard raw...