The rotational spectrum of 2-bromopyridine was reinvestigated in the frequency range of 10–15.5 GHz by Fourier transform microwave (FTMW) spectroscopy. New observations of 14N hyperfine splittings have been observed for both the bromine-79 and -81 isotopologues in addition to five centrifugal d...

Application in sequence of periodate oxidation, borohydride reduction, tosylation, and treatment with sodium sulphide to methyl α-l-rhamnopyranoside affords (2R,6S)-2-methoxy-6-methyl-1,4-oxathiane. Likewise, methyl 6-O-trityl-α-d-glucopyranoside and 1,6-anhydro-β-d-glucopyranose were convert...

1,4-Oxathianes have been prepared in five steps from camphor and used to give stilbene oxides in excellent yield (81–100%) and with moderate enantioselectivity (54–64% ee).

Thieno[3,4-b]-1,4-oxathiane (EOTT), one asymmetrical analog of 3,4-ethylenedioxythiophene (EDOT), was synthesized and its chemical oxidative polymerization was carried out in different solvents (dichloromethane, water, and acetonitrile (CH2Cl2, H2O, and ACN)). The effect of the solvent on the st...

Complexes between hydrated lanthanide(III) perrhenate salts and the ligand MMNO were prepared following the stoichiometry Ln(ReO4)3·(MMNO)6 (Ln=La, Nd, Eu, Er, Yb and Y). They were characterized by conductance measurements in acetonitrile, powder X-ray diffraction patterns, IR vibrational spect...

4-Methylmorpholine has been fluorinated with cobalt(iii) fluoride to give ten highly fluorinated morpholines and one minor breakdown product. Mass spectrometry and NMR spectroscopy (1H and 19F) were utilised extensively in the assignment of product structures. A cation-radical mechanism is proposed.

The compounds show a general formula Ln(NO3)3·3MMNO. They are hygroscopic and present similar colour patterns to those of the respective lanthanides, but less intense. They are insoluble in acetonitrile, benzene, ethanol and methanol. X-ray diffraction indicates five types of patterns, with two...

Complexes of Eu(III) with 4-methylmorpholine-N-oxide (MMNO), with perchlorate, hexafluorophosphate and trifluoro-methane-sulfonate as counter ions were prepared and characterized by elemental analysis and IR spectroscopy. The room temperature fluorescence spectrum of Eu(ClO4)3·6MMNO suggests an...

Crystal structure of the 1:1 complex of N-methylmorpholine betaine (MMB) with 4-hydroxybenzoic acid (4-HBA) has been determined by X-ray diffraction. Crystals are orthorhombic, space group Pna21 with a=7.933(2), b=15.336(3), and c=12.007(2)Å, Z=4, R=0.033. The acid molecule forms two O–H⋯O hyd...

The experimental FT-IR (4000–400 cm−1) and FT-Raman (3500–100 cm−1) spectra of 4-Methylmorpholine were recorded. The observed bands were interpreted with the aid of normal coordinate analysis and force field calculations based on density functional theory (DFT) using B3LYP functional theory (D...

4-methylmorpholine (4-mMPL), a nitrogen-containing heterocyclic compound, is an organic base which acts as a proton acceptor. In this study, we characterized structure H (sH) clathrate hydrates with 4-mMPL by measuring the hydrate-phase equilibria and a series of microscopic analyzes (powder X-r...

Charge-transfer complexes between 1-methylpiperazine (1MPIPZ) as a donor with the π-acceptors 7,7,8,8-tetracyanoquinodimethane (TCNQ), tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), 2,3,5,6-tetrachloro-1,4-benzoquinone (chloranil = CHL) and σ-acceptor iodine (I2) h...

We report the preparation and results of vibrational spectral analysis, which were obtained using both FT-IR and FT-Raman spectroscopy, for three 1-alkyl-1-methylpiperazine-1,4-diium salts (AMPSs), where alkyl is benzyl 4a, n-octadecyl 4b, and methyl 4c, respectively. These were prepared by mult...

A high-performance liquid chromatography (HPLC) assay with UV detection was developed for the determination of five polyamines, i.e., 1,3-diaminopropane (DAP), putrescine (PUT), cadaverine (CAD), spermidine (SPD) and spermine (SPM). Primary (NH2) and secondary (NH) amines in the polyamine struct...

The new inorganic-organic hybrid material 1-methylpiperazine-1,4-diium bis(nitrate) (MPN) have been synthesized and crystallized to the orthorhombic system with space group Pnma and the lattice parameters obtained are a = 10.9385(9) Å, b = 6.5698 Å (4), c = 13.7021(10) Å, V = 984.68(12) Å3 and Z...

The concentrations of allopregnanolone (Allopreg), pregnenolone (Preg) and androsterone (ADT) are very low in the circulation, especially in postmenopausal women, resulting in a considerable challenge for their accurate measurements in serum or plasma. In this report, a sensitive and reliable LC...

Experimental FTIR and FT-Raman spectroscopic analysis of 1-Amino-4-methylpiperazine (1A4MP) have been performed. A detailed quantum chemical calculations have been carried out using ab initio HF and density functional theory calculations (B3LYP) with 6-311+G(d,p) basis set. The atomic charges, e...

An accurate thermodynamic model is the primary element needed for the process simulation and optimization for CO2 absorption in aqueous amine solutions. In this work, the thermodynamic model was built in Aspen Plus, using the electrolyte nonrandom two-liquid (ENRTL) activity coefficient model to...

The aim of this work is to study the degradation of an innovative solvent for post-combustion CO2 capture composed of 1-methylpiperazine (30% w/w), piperazine (10% w/w) and water (60%) (1MPZ/PZ/Water). Cycling of the solvent has been realized on a lab-scale pilot plant with conditions representa...

Post-combustion CO2 capture process using amine solvents is limited by the high energy penalty and the irreversible degradation of amines. The present work aimed at studying the degradation of the innovative blend 1-methylpiperazine/piperazine (1MPZ/PZ: 30/10%wt.) in a lab-scale pilot plant, LEM...