The transformation of methyl tert-butyl ether ~MTBE! and tert-amyl methyl ether ~TAME! using bifunctional aluminum in the presence of dioxygen ~O2! has been examined. Bifunctional aluminum, prepared by sulfating zero-valent aluminum with sulfuric acid, is an innovative extension of zero-valent metal technology. It has a dual functionality of simultaneously decomposing both reductively and oxida...

UNLABELLED Methyl trans-styryl ketone is used as a synthetic flavoring agent and a fragrance additive in food and personal care products. Methyl trans-styryl ketone was nominated for study by the National Cancer Institute due to widespread human exposure as a flavoring and fragrance additive, positive results in the Ames/Salmonella assay and the mouse lymphoma L5178Y/tk+/- assay, and as a repre...

A mast cell protease has been purified over 260-fold from rat thyroid homogenates. The purified enzyme hydrolyzes denatured thyroglobulin, denatured hemoglobin, and fibrinogen. It also rapidly hydrolyzes the ester substrates, benzoyltyrosine ethyl ester, benzoylphenylalanine ethyl ester, and acetyltyrosine ethyl ester. The pH optimum for thyroglobulin and benzoyltyrosine ethyl ester hydrolysis ...

In this study, waste corncobs are ground and used in the polyester composite. Homogeneous distribution is provided by mixing it into unsaturated (UP) as a filler under laboratory conditions. Then, methyl ethyl ketone peroxide (MEKP) cobalt octoate (Co Oc) catalysts added to mixture. After additives fillers certain amounts for short time, composites poured standard molds waited curing. The densi...

A solvent- and halogen-free synthesis of high purity triflate ionic liquids via direct alkylation of organic bases (amines, phosphines or heterocyclic compounds) with methyl and ethyl trifluoromethanesulfonate (methyl and ethyl triflate) has been developed. Cheap and non-toxic dimethyl and diethyl carbonate serve as source for the methyl and ethyl groups in the preparation of methyl and ethyl t...

This study presents synthesis results of catalysts made perovskite-like oxide La2-xSrxCuO4 (x=0.0, 0.5, 1.0) using the citrate method and crystallisation at 800°C. The structure was characterised by X-ray diffraction (XRD). catalyst activity enhanced with gold (Au) platinum (Pt). Au mounted on sol-gel method. perovskite LaMnO3/LaCuO3 evaluated complete oxidation volatile hydrocarbons (HCs) in a...

Background: Candida albicans is the most prevalent fungi isolated in endodontic infections. In this study, ability of C. biofilm to tolerate novel solvent mixtures methyl ethyl ketone (MEK)/tetrachloroethylene (TCE) and MEK/orange oil (OOil) sequentially standard irrigation sodium hypochlorite (NaOCl) ethylenediaminetetraacetic (EDTA) was evaluated. Methods: Biofilm cell cultures SC 5314 were t...

Through a novel sequence of aminodiene Diels-Alder reactions, amidofurans 18a-c were converted to tricyclic ketones 21a-c in moderate to good yields. Ketone 21a could be converted to Uhlé's ketone (6) by cleaving the tert-butyl carbamate and oxidatively removing the methyl ester. Tricycle 21a readily underwent bromination to give 22. Formation of the corresponding enol triflate 25 followed by c...

A methyl ketone accelerates the Pd-catalyzed C–H activation of simple arenes. noninnocent solvent, it reacts in a reversible way without affecting outcome reaction.

In this study, we wanted to understand the impact of different decaffeination processes on aroma compounds coffee. Therefore, analyzed differences in physical characteristics and volatile profiles regular coffee (RC), Swiss water process decaffeinated (SWDC), supercritical CO2 (SCDC) after roasting beans. The electronic nose analysis identified RC SCDC as groups which indicates that these compo...