Compared to carboxylic acids, carboxylic anhydrides are efficient acylating agents. Mixed anhydrides are appreciated in organic chemistry because of their high reactivity. They are finding an increasing interest in the chemical industry.This work describes a novel and efficient method of synthes...

The use of selected autochthonous mesophilic lactic acid bacteria as starter cultures was investigated according to the traditional protocol for making Pecorino Crotonose (PC). Leuconostoc mesenteroides subsp. mesenteroides 2A, Lactobacillus casei 23C and Lactobacillus plantarum 18C (Autochthono...

Potassium/ammonium salts of 12-molybdophosphoric acid were modified by the addition of Sb3+salt, and the chemical–physical features as well as the reactivity in isobutyric acid oxidehydrogenation of the compounds obtained were studied. All the salts prepared were monophasic and the secondary st...

The oxidative dehydrogenation of isobutyric acid (IBA) to methacrylic acid (MAA) has been studied over a series of 12-heteropoly oxometalate catalysts. H3PMo12O40, Cs3PMo12O40. (NH4)3PMo12O40, and a series of catalysts prepared using an ion exchange modification that resulted in the formation of...

Effects of variable amounts of vanadyl or/and copper counter-ions of the heteropolyanions [PMo12O40]3− and [PMo11VO40]4− on the catalytic oxidative dehydrogenation of isobutyric acid are reported. For the molybdophosphate, selectivity to methacrylic acid increases continuously with respect to th...

The relative and absolute K+ affinities of a full series of aliphatic amino acids (Gly, Ala, Val, Leu, Ile and α-amino-isobutyric acid (α-AiB)) and N-methylated aliphatic amino acids (N-Me-(Gly/Ala/α-AiB/Val/Leu)) were investigated theoretically by density functional theory calculations at th...

Heteropolycompounds of the composition Kx(NH4)3−xPMo12O40 were prepared by precipitation, through addition of HNO3 to an aqueous solution of the salts. The precipitated compounds were calcined at increasing temperatures to evaluate the thermal behavior, and were characterized by means of X-ray d...

Effect of NaCl and KCl salts on single drop hydrodynamic and mass transfer of isobutyric acid from aqueous to cumene phases was studied. Drop size, extraction fraction and mass transfer coefficient were decreased as a consequence of isobutyrate ion adsorption which is quite obvious from interfac...

The heat capacity morphology of potassium n -hexanoate from T =  6 K to T =  350 K was determined by equilibrium adiabatic calorimetry and by differential scanning calorimetry (d.s.c.) from T =  300 K to T =  635 K. The curve was characterized by peaks assumed to be associated with solid  →  so...

Clinical observations suggest that certain gut and dietary factors may transiently worsen symptoms in autism spectrum disorders (ASD), epilepsy and some inheritable metabolic disorders. Propionic acid (PPA) is a short chain fatty acid and an important intermediate of cellular metabolism. PPA is ...

The preparations are reported of 3-[1-(4-nitroimidazoyl)]propionic acid, 3-[1-(2-methyl-4-nitroimidazoyl)]propionic acid and 3-[1-(2-nitroimidazoyl)]propionic acid, and also of some cobalt(II), copper(II), rhodium(II) and platinum(II) complexes with these ligands or with 3-[1-imidazoyl]propionic...

The objective of this research was to determine whether microbial inoculants, propionic acid, or beet pulp would enhance the fermentation of wet brewers grains under short-term or long-term storage. In trial 1, three treatments (control and two amounts of lactic acid bacteria) were applied to we...

Propionic acid is widely used as a preservative in (poultry) feed. In this study we have isolated and identified fungal strains from nine samples poultry feed originating from different countries. The majority of the strains were Aspergilli with a eurotium-morph, such as Aspergillus proliferans ...

A monoazo dye, 4-[(2-methoxy-4-nitro-phenylazo)-phenyl]-dimethyl-amine (C15H16N4O3) was synthesized and characterized by X-ray diffraction, IR, 1H NMR, and elemental analysis. The title molecule crystallizes in the triclinic system, space group P-1 (#2), a = 7.301(4), b = 13.854(7), c = 14.575(7...

Six azo dyes derived from the common 2-amino-4-chloro-5-formylthiophene-3-carbonitrile unit and different aniline based couplers were synthesized by the traditional diazotization-coupling strategy. Solvatochromism has been studied for this family of donor−π−acceptor heterocyclic azo dyes. Furth...

Block copolymerization of 1-chloro-2-phenylacetylene (ClPA), 2-nonyne, and (p-n-butyl-o,o,m,m-tetrafluorophenyl)acetylene (p-BuF4PA) as novel comonomers through the sequential addition process was studied by use of MoOCl4-based living polymerization catalysts. The acetylenes that are known to un...

We present here anticorrosive silica coatings doped with lanthanum ions for the protection of metallic surfaces as an alternative to chromate (VI)-based conversion coatings. The coatings were synthesized by the sol–gel method starting from silicon alkoxides and two different lanthanum precursor...

Seven heterobimetallic isopropoxide derivatives of lanthanum have been synthesized by the reaction of LaCl3·3PriOH with K02(OPri)9 in different molar ratios (1:1, 1:2, 1:3) to yield hydrocarbon-soluble derivatives of the types [Cl3-nLa{Zr2(OPri)9}n] (n = 1, 2 or 3). The reactions of the above b...

A highly efficient synthesis of the key intermediate 2 of 1β-methylcarbapenems was accomplished in 10 steps and 30% overall yield starting from commercially available (S)-methyl 3-hydroxy-2-methylpropionate. The explored synthetic scheme features the addition reaction of diketene with a chiral ...

The synthesis of (S) 2-ethyl-2-methylpentanoic acid 13 from the C-5 aldehydo ester 1, obtained through a baker's yeast transformation, via C-2 and C-1 chain elongations by means of olefin-forming reactions is reported.