The mechanism of asymmetric amination of diazo-acetate by tert-butyl carbamate catalyzed by dirhodium tetra(trifluoro)acetate and chiral SPINOL-phosphoric acid is examined using DFT (M06 and B3LYP) computations. A cooperative participation of both catalysts is noticed in the stereo-controlling transition state of the reaction.

Many industrial practices and waste treatment operations produce gas streams containing volatile organic compounds (VOCs) that require treatment. Although biological treatment has been applied successfully to treat many waste gases, the literature contains numerous reports of diminished treatment performance under conditions of excessive drying or low pH in biofilter beds. Use of fungi in biofi...

The carbon dots were prepared by the microwave method, and then TiO2 doped with was successfully synthesized hydrothermal method. Its structure investigated using TEM, XRD XPS. catalyst applied to degradation of lignin base solution (50 mg in 30 mL sodium hydroxide pH = 12) under ultraviolet light. It found that when mass ratio point 1.5:1, dosage 0.75 g/L, time 6 h, rate could reach more than ...

A simple, rapid, specific and precise reversed-phase high-performance liquid chromatographic method was developed for simultaneous estimation of triacetin, acetic ether, butyl acetate and amorolfine in marketed pharmaceutical liniment. Chromatographic separation was performed on a Shimadzu VP-ODS C(18) column using the mixture of citric acid-hydrochloric acid-sodium hydrate buffer (pH 3.0), ace...

Phase inversion cellulose acetate propionate membranes showed low permeability to hydrogen peroxide aqueous solutions. Their permeability was increased by alkaline hydrolysis of the ester linking units. However, the permeability remained lower than that of an unsubstituted cellulose membrane. The inclusion of hydroxypropyl cellulose in the membrane formulation, followed by an alkaline hydrolysi...

The structures of three novel compounds prepared from the reaction of the lower-rim 1,3-diacid calix[4]arene (LH(2)) with lithium carbonate (1), t-butyl-lithium (2) and zinc acetate (3) are reported.

      Butyl-hydroxytoluene (BHT) is one of the major synthetic antioxidants with a wide range usage. Replacement of artificial antioxidants with natural antioxidants is highly considered. In this research, the antioxidant activity of Juniperus excelsa was investigated by using reducing power, DPPH radical scavenging and inhibition of lipid peroxidation. Also, the amounts of phenolic an...

We describe the design and simulated response of a dust logger consisting of a downward-pointing phototube, ~2 m below side-directed light-emitting diodes (LEDs), attached to a cable that can lower the device down a 3-in. (7.5-cm) borehole filled with butyl acetate. LED photons that enter the ice are scattered or absorbed by dust grains, and those that reach the phototube provide a measure of d...

In the centrosymmetric title compound, [Cu(2)(C(21)H(30)N(3)O)(2)(C(2)H(3)O(2))(2)], each Cu atom has a distorted tetra-hedral coordination geometry defined by N and O atoms in a chelate ring, N of an imidazole ring, and an acetate O atom. The uncoordinated acetate O atom is disordered over two sites with occupancies 0.7:0.3.