Regio and stereoselective opening of three membered rings by metal halides was utilized for the enantioselective synthesis of (2S,3R)-3-amino-2-hydroxydecanoic acid and (3R)-3-aminodecanoic acid.

An efficient synthesis of 3-amino-2-hydroxydecanoic acid (AHDA), a nonproteinogenic amino acid, using enantiopure 3-benzyloxy-4-formylazetidin-2-one as a building block is described. Both the enantiomers of AHDA have been synthesized from the corresponding enantiomer of 3-benzyloxy-4-formylazeti...

New analogues of androgens that had never been available as approved drugs are marketed as “dietary supplement” recently. They are mainly advertised to promote muscle mass and are considered by the governmental authorities in various countries, as well as by the World Anti-doping Agency for sp...

The influences of contact angle, surface tension and zeta potential on oil agglomeration recovery of celestite mineral have been investigated in the present work. Therefore, celestite mineral in methanol–water suspension was agglomerated by the use of oil (kerosene) in the presence of sodium ol...

The effect of depressant citric acid (CA) on flotation separation of celestite from fluorite and calcite using anionic collector sodium dodecyl sulfate (SDS) is investigated. Through a series of micro-flotation tests, solution chemistry and reaction thermodynamic analysis, zeta potential measure...

The major celestite deposits in Zagros Fold belt are associated with coastal marine carbonate and evaporate sediments of Oligo-Miocene Asmari and Lower Miocene Ghachsaran Formations. In the Abolfares region, celestite mineralization is extended in the western limb of Bangestan anticline in the c...

From viewpoints of long-term safety assessments of disposal systems, it has become an important issue to clarify effects of porosity in compacted illite on diffusion behavior of non-sorbed species, cations, and anions. Therefore, in this study, celestite precipitation was artificially induced in...

Celestite (SrSO4) single crystals immersed in highly concentrated Na2CO3 aqueous solutions (0.5 mol/l) are progressively pseudomorphised by aggregates of strontianite (SrCO3) crystals at ambient conditions. This replacement occurs by the coupling of dissolution and crystallisation reactions, eve...

Atmospheric NO is one of the toxic and hazardous gases. Its’ levels are continually rising in recent years. As we known, mineral particles contained in the atmosphere may affect the photocatalytic NO removal process. In this study, we found that celestite modification could greatly improve the ...

To cope with the increase of sulfate gangue minerals in fluorite ores, flotation separation of fluorite from calcite and celestite using Al2(SO4)3 and acidified water glass (AWG) as mixture depressants was studied in this paper. The flotation separation performance and underlying mechanism were ...

The dissolved components of calcium-bearing gangue minerals will adsorb onto the celestite surface, which increases the difficulty of the flotation separation of celestite from fluorite and calcite. Single mineral and artificial mineral flotation experiments show that EDTA exhibits an excellent ...

tert-Butyl 2-hydroxyalkyl sulfides, prepared by reaction of epoxides with 2-methylpropane-2-thiol, are converted directly to 1,3-oxathiolanes upon treatment with pivalaldehyde and boron trifluoride diethyl etherate in the presence of thioanisole.

The biodegradation of 4-fluorobenzoic acid (4-FBA) and 4-fluorocinnamic acid (4-FCA) has been monitored by membrane inlet mass spectrometry (MIMS) using a hollow-fibre silicone membrane. A novel in-membrane pre-concentration/thermal desorption (IMP-MIMS) technique was employed for MIMS analysis ...

A rotating biological contactor (RBC) was used to treat shock loadings of 4-fluorocinnamic acid (4-FCA). Intermittent 4-FCA shocks of 35 mg L−1 were applied (ca. 3 months) with only limited mineralization occurring and accumulation of 4-fluorobenzoate (4-FBA) as an intermediate. After bioaugment...

Mandelic acid (1) and its derivatives and 1-naphthylglycolic acid (8) were used as modifiers for the asymmetric hydrogenation of ketopantolactone to pantolactone on supported Pt, Ru, and Rh catalysts. A systematic variation of the modifier structure showed that 8 was the best modifier, affording...

6-Methoxy-2-naphthylglycolic acid (6-MNGA) was designed as a novel acidic resolving agent, on the model of 2-naphthylglycolic acid (2-NGA). Enantiopure 6-MNGA was easily obtained from commercially available 2-bromo-6-methoxynaphthalene through four steps and was found to show a better chiral rec...

The absolute stereochemistry of the non-anomerically stabilised spiroacetal, (Z,Z)-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane, 4 which is a significant component of the pheromonal gland secretion of the cucumber fly (Bactrocera cucumis French) is shown to be (2S,6S,8S) by synthesis of its enantiom...

(1S,2S,5R,6S)-2-Aminobicyclo[3.1.0]hexane-2,6-dicarboxylic acid (LY354740) was synthesised enantiospecifically from a sugar derived enantiomerically pure cyclopentenone. The α-amino acid stereogenic centre was formed by reacting the ketone with chloroform anion and then the alcohol so formed wa...

Previously we have demonstrated an association between maternal serum 25-hydroxyvitamin D (25(OH)D) during pregnancy and knee-heel length in offspring at birth. However, it is unknown whether maternal serum 25(OH)D is associated with bone measures in childhood. Thus, we aimed to examine associat...

Neutron generators (NG) are being increasingly used in various industrial and research areas such as neutron activation analysis, neutron radiography, and neutron capture therapy. In such applications of neutron generators, compactness is one of the most important issues. Since a neutron source ...