The effect of mannitol and 1,2-octanediol on gibbsite crystallization from seeded sodium aluminate liquor was investigated and compared. The inhibitory effect of mannitol increases with its concentration, in good agreement with other strong inhibitors. Low concentrations of 1,2-octanediol have n...
This paper describes the stereoinversion of (R)-1,2-octanediol promoted by Aspergillus niger CCT 1435 and Candida albicans CCT 0776 from Brazilian collections. Racemic 1,2-octanediol can be converted into (S)-1,2-octanediol with 70% isolated yield and 99% ee in 10 h using C. albicans. This is on...
Volatile free fatty acids (
The inhibitory effect of acids on microbial growth has long been used to preserve foods from spoilage. While much of the effect can be accounted for by pH, it is well known that different organic acids vary considerably in their inhibitory effects. Because organic acids are not members of a homo...
The microwave spectrum of n-hexyl acetate was recorded in the range of 10–13.5 GHz using the Aachen MB-FTMW spectrometer. The rotational constants of the most abundant conformer were determined to be A = 3.3591100(32) GHz, B = 0.39596553(53) GHz, and C = 0.36999804(31) GHz. Quantum chemical cal...
The Michael addition of pseudouridine with various propiolates in the presence of DBU as a base and DMF as a solvent is described. It is noteworthy that the reaction is highly regio- and stereoselective and affords (E)-pseudouridine-N1-acrylate in good yields with high purities.
A biobased diluent, cardanyl acrylate (CA), was synthesized from cardanol and used to modify a castor oil-based polyfunctional polyurethane acrylate (PUA) resin. Firstly, chemical structure of CA was characterized by FT-IR, 1H NMR, and 13C NMR. Subsequently, the effect of CA’s content on the bi...
Eudragit® E PO (EPO) is a terpolymer based on N,N-dimethylaminoethyl methacrylate with methylmethacrylate and butylmethacrylate, produced by Evonik Industries AG as a pharmaceutical excipient. In this work, EPO was chemically modified through reaction with acryloyl chloride. The successful modif...
Amphiphilic poly(N,N-dimethylamino-2-ethyl methacrylate)-g-poly(ε-caprolactone) graft copolymers (PDMAEMA-g-PCL) with various compositions and molecular weights were synthesised via a fully controlled three-step strategy. First, poly(ε-caprolactone) macromonomers (PCLMA) were prepared by ring-...
A highly stereoselective one-step method for the synthesis of alkyl (E)-(3-dimethylamino)acrylates from N,N-dimethylformamide and ketene acetals is reported.
Well-defined poly(methyl acrylate) (PMA) and poly(n-butyl acrylate) (PBA) are prepared via photochemically induced atom transfer radical polymerization (photoATRP) using ppm amounts of CuBr2/tris[2-(dimethylamino)ethyl]amine (Me6TREN) catalyst complex without degassing of the polymerization mixt...
We present the synthesis and characterization of poly(ethyl 2-(imidazol-1-yl)acrylate) (PEImA) using free radical polymerization in various solvents with and without acids as additive. In addition, PEImA was also prepared using anionic polymerization with KOtBu as initiator in DMF and in THF at ...
A new procedure was developed for functionalization in the solid phase by using microwave irradiation. Heterogeneous chemical modification of poly(ethylene-butyl acrylate) copolymer (EBA), hydrolysis, chlorination, and Schotten–Baumann reactions were monitored by attenuated total reflection Fou...
Monoacetate 3 is a synthetic equivalent of asymmetrized tris (hydroxymethyl)methane 1, which is a new chiral building block endowed with latent C3v symmetry. Thanks to this property, starling from a single enantiomer 3, it is possible to get not only both (R) and (S) aldehydes 7, but also all th...
Under moderate conditions aldoenol esters react with HAl(i-C4H9)2 to afford organoaluminium compounds, which upon hydrolysis yield 1,3-diols and on acetolysis form 1,3-diacetates. The diacetates are obtained in about 50% yields (based on enol ester) by distillation. Vinyl esters are converted to...
The kinetic resolution of ferrocenyl aldol 2 was achieved by a lipase-catalyzed esterification in organic solvent. Lipase from Candida antarctica was also found effective in promoting the enantioselective alcoholysis of acetate (±)-3 with n-BuOH. Both enantiomers of 2 were obtained in enantiopu...
The direct catalytic conversion of 2,3-butanediol (BDO) to 1,3-butadiene (BD) was studied over two commercial forms of alumina (denoted as F200 and SCFa) at temperatures between 240 °C and 450 °C. Even though these two catalysts are both high surface area forms of γ-alumina, they gave remarka...
One-pot three-component reactions of arylaldehyde or salicylaldehyde with malononitrile (or ethylcyanoacetate) and triethyl phosphite are carried out in the presence of ethylenediamine diacetate (EDDA) as a catalyst for the synthesis of biologically interesting β-phosphono malonates and 2-amino...
The highly efficient selective monohydrolysis of symmetric diesters has been applied to monohydrolysis of several dialkyl malonates and their derivatives. The best conditions apply 0.8–1.2 equiv of aqueous KOH with a co-solvent, THF or acetonitrile, at 0 °C. The procedure is highly practical, ...
Reaction of sodium (E/Z)-2-(2-(1-cyano-2-methoxy-2-oxoethylidene)hydrazinyl)benzene-sulfonate (NaHL) with copper(II) nitrate hydrate in the presence of imidazole (im) in methanol affords [CuL(im)(H2O)] (1). Complex 1 is characterized by IR spectroscopy and ESI-MS spectrometry, elemental and sing...
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