An efficient sequential four-component reaction of chromone carbaldehydes, Meldrum's acid, 4-hydroxyl coumarin or 6-methyl-4-hydroxyl-pyrone and primary alcohols is reported which leads to 5a-i in aqueous media. Replacing the primary alcohol with isopropyl alcohol and tert-butyl alcohol results in different products 10 and 11. The environmentally friendly features, good to high yields and easy ...

To gain insight into the effects of liquid-liquid phase separation on molecular relaxation behavior we have studied an apparently homogeneous mixture of 5-methyl-2-hexanol and isoamylbromide by dielectric spectroscopy over a broad temperature range. It shows two relaxation regions, widely separated in frequency and temperature, with the low-frequency relaxation due to the alcohol and the high-f...

0016-2361/$ see front matter 2011 Elsevier Ltd. A doi:10.1016/j.fuel.2011.08.055 ⇑ Corresponding author at: Department of Automo Kocaeli University, 41380 Kocaeli, Turkey. Tel.: +90 3032203. E-mail addresses: [email protected] (M. Canakci). In this study, animal fat obtained from leather industry fleshing wastes was used to produce methyl ester. The acid value of the fleshing oil was 24...

In this paper, natural sunflower seed oil was used as the raw material to extract mixed fatty acids with potassium hydroxide-methyl alcohol solution, and then benzene methanol were added for methylation reaction, finally saturated unsaturated acid methyl ester separated by urea encapsulation method. The optimal reaction temperature of extraction process, dosage ratio freezing in process explore...

Hyphomicrobium strain WC, Pseudomonas strain TP-1, and Pseudomonas strain W1 are capable of growth on methanol as the sole source of carbon and energy. Methanol-grown cells of each organism contain a primary alcohol dehydrogenase that has been purified to homogeneity. Each enzyme has a molecular weight of 120,000 and shows an in vitro requirement for phenazine methosulfate and ammonium ions for...

In this communication, we prepared carbon nanotubes (CNTs) modified by poly(vinyl alcohol) that are used as co-stabilizers for the dispersion polymerization of methyl methacrylate. Poly(methyl methacrylate) microspheres with CNTs selectively located at their surface are formed. This specific localization is a way to enhance the electrical conductivity of the nanocomposite.

The ionization and fragmentation patterns of 24 compounds with elemental composition CmH2mO2, including isomeric esters alkanoic acids, were investigated by atmospheric pressure corona discharge collision-induced dissociation (CID) mass spectrometry in the positive-ion mode. All ionized as protonated molecules NH4+ adducts. In addition, fragment ions observed spectra other than methyl esters, w...

A cell free system prepared from etiolated cucumber (Cucumis sativus, L) in tris-sucrose buffer is able to incorporate delta-aminolevulinic acid-4- (14)C into the two components of protochlorophyll: protochlorophyllide and protochlorophyllide ester. The activity is associated with the etioplasts. Optimal incorporation is obtained at pH 7.7. For the formation of protochlorphyllide ester, oxygen,...

Radiocarbon from I4C-acidand 14C-alcohol-labeled preparations of transand cis-permethrin administered orally to lactating Jersey cows for three consecutive days at 1.0 mg/kg is largely eliminated from the body within 12 or 13 days after the initial treatment. Milk and fat residues, although relatively low, are higher with cisthan with trans-permethrin and consist almost entirely of unmetabolize...

The objective of the present study was to evaluate the physicochemical and microbial properties of the Korean traditional rice wine Makgeolli, supplemented with banana during 6 day fermentation. The alcohol contents of the control and banana Makgeolli were 17.0 and 16.5%, respectively. The pH values decreased while total acidity, total soluble solids, and color values increased throughout the f...