The (Pd-Cu)-catalyzed reactions of trimethylsilyl acetylene with (E) or (Z)-chloroenynes, or 1-chloro-(1E,3E)-dienes, followed by desilylation and zinc-reduction of the triple bonds led respectively to (3E,5Z), (3Z,5Z) and (3E,5E)-trienes. Application to the syntheses of galbanolenes and (9Z,11E...
(3E,5Z)-1,3,5-Undecatriene (3) having 98.2% stereoisomeric purity has been prepared by a new and expeditious route involving two selective Pd-catalyzed carbon-carbon bond forming reactions. The key step of this synthesis is a highly diastereoselective Pd-catalyzed cross-coupling reaction between...
The density functional theory was employed to investigate the adsorption of Nin (n = 1–4) on the perfect and O-defect CuAl2O4 surfaces. The computational results show that for single Ni atom on the perfect spinel (100) surface, the adsorption energy is −5.30 eV, much larger than Ni on other CuA...
Photo-induced isomerization of cis-[Pd(L1,2-κS,O)2] (HL1 = N,N-diethyl-N′-4-methyl-benzoylthiourea, HL2 = N,N-dimethyl-N′-benzoylthiourea) in acetonitrile solution leads to the reproducible and clean isomerization of rare, new trans-[Pd(L1,2-κS,O)2] complexes, isolated by vapour diffusion cr...
In the study, the N-doped K0.5Na0.5Nb0.7Ta0.3O3-xNx (x = 0.035, 0.055, 0.073) lead-free piezoceramics were successfully synthetized by the reaction of KNNT powders with urea. We systematically researched the influences of N3− partially substituted O2− on ceramics phase structure, microstructure,...
1-alkyl-2-pyridones, 2a-c, and 2-acyl-2-hydroxypyridines, 3a-b, were synthesized under ultrasonic irradiation. The synthesized compounds were characterized by 1HNMR and FTIR spectroscopy. DFT calculations were performed in order to study reactivity of the N and O-sites of 2-hydroxypyridine towar...
We solve analytically the renormalization-group equation for the potential of the O(N)-symmetric scalar theory in the large-N limit and in dimensions 2
3-Aminoaspartic acid derivatives 3 have been synthesized via stereoselective alkylation of α-acetyloxyglycine Schiff base 2 with the enolate of glycine anion equivalent 1 as a carbon nucleophile in the presence of Pd(OAc)2 and BINAP at room temperature. High chemical yields and moderate stereos...
The demand for fresh and natural products is increasing worldwide. Therefore, new production methods of natural flavor compounds have attracted the attention of food manufacturers. In this scenario, biocatalyzed chemical synthesis is being explored as an alternative to produce flavoring compound...
An easy two-stage approach was proposed to prepare microencapsulated phase-change materials (MEPCMs) with n-heptadecane as the core and hexanediol diacrylate (HDDA) polymer as the shell in a co-flowing microfluidic device. The micromorphology and chemical compositions of the MEPCMs were investig...
Multicomponent synthesis of 5-C substituted 2,4-diamino-5H-chromeno[2,3-b]pyridine-3-carbonitriles from salicylaldehydes 2-aminoprop-1-ene-1,1,3-tricarbonitrile and 1,3-cyclohexanediones was carried out in 59–88% yields. The structures of compounds obtained were characterized by several techniq...
Phosphorescence spectra of 2-bromobenzophenone (2Br-BP) crystals were measured from 70 K to room temperature. A capital crossover in the emission mechanism takes place within this temperature range, leaving at room temperature only a broad two-hump feature. Additional phosphorescence experiments...
Free radicals have been generated by the one-electron oxidation of the nephrotoxin 4-aminocatechol in aqueous solutions and aqueous solvent mixtures. Both autoxidation and photo-oxidation give rise to characteristic ESR spectra. Spectral analyses using computer simulation of spectra together wit...
The syntheses have been developed for quaternary N-(1,4-anhydro-5-deoxy-2,3-O-isopropylidene-d,l-ribitol-5-yl)ammonium salts derived from five aromatic amines, pyridine, 2-methylpyridine, 3-carbamoylpyridine, 4-(N,N-dimethylamino)pyridine, and quinoline, as well as two tertiary aliphatic amines,...
The synthesis and isolation of 1,4-anhydro-5-deoxy-5-iodo-2,3-O-isopropylidene-d,l-ribitol and N-[(1,4-anhydro-5-deoxy-2,3-O-isopropylidene-d,l-ribitol)-5-yl]trimethylammonium iodide are described. The products were examined by 1H, 13C NMR spectroscopy, and N-[(1,4-anhydro-5-deoxy-2,3-O-isopropy...
Two complexes of 4,5-bis(methylthio)-1,3-dithiole-2-thione (C5H6S5), C5H6S5CuI (1) and (C5H6S5)2PdI2 (2), have been synthesized and characterized crystallographically. They are assembled into ribbon structures by coordination bonds and S⋯S contacts. There are very short S⋯S contacts (3.268 Å) be...
Porphyrin derivatives for photodynamic therapy are frequently modified with hydrophilic groups to improve their water solubility; however, such hydrophilic groups not only improve the solubility but also affect the photodynamic behavior of the compound. The suitable number and pattern of the hyd...
The synthesis of new methallyl-ferrocenyl-thiazoline-nickel complexes [1-(2-thiazolin-2-yl)-2-(R-thio)-ferrocene-κ2N,S]-(η3-methallyl)nickel(II) [Y] (1-3, R = Me, i-Pr, Ph, Y = BF4- 4, R = Me, Y = BAr´4-) by reaction with 2-ferrocenyl-2-thiazoline ligands L1–3 with [Ni-(η3-(CH2)2CMe)Cl]2 in...
Herein we describe the total synthesis of (±) Neorautane 1, (±) Neorautanin 2 and their analogs 15–18. The key intermediates Chromenes 10–13 were synthesised by microwave irradiation of propargyl phenyl ethers 8 and 9 in DMF under pressure.
Publisher SummaryThe acids in the series of alkanedicaxboxylic acids contain two carboxyl groups and are therefore, dibasic. The physical properties of the dicarboxylic acids in the solid state, for example, melting point, refractive index, solubility and so on, show pronounced alternation on as...
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