Search results for "ethanol"

Studies on the synthesis of heterocyclic compounds. Part IX. Action ofN,N-dimethylformamide dimethylacetal on some oximino-β-dicarbonyl compounds

1982

3-Oximino-2,4-pentanedione (1) and ethyl 2-oximino-3-oxobutanoate (6) reacted with N,N-dimethylformamide dimethylacetal (DFDA) to give 1,7-bisdimethylamino-3,5-dioxo-4-methoximinohepta-1,6-diene (4) and ethyl 5-dimethylamino-2-methoximino-3-oxo-4-pentenoate (8), respectively. When compounds 4 and 8 were treated with hydrazine hydrate, they gave O-methyldipyrazol-3(5)-ylketoxime (5) and ethyl 2-methoximino-3(5)-pyrazolylethanoate (9) together with its corresponding hydrazide 10, respectively. Upon action of DFDA on 3-oximino-2,4-pentanedione (1) at -20° an explosive crystalline product was obtained. On the other hand, the reaction of 3-acetoximino-2,4-pentanedione (11) with DFDA at -20° affo…

Herstellung molekulareinheitlicher, aus methylenverbrückter 4-Hydroxybenzoesäre bestehender Mehrkernverbindungen sowie einiger einfacher und gemischt…

1971

Mit einer besonderen Methode, bei der halogensubstituierte Ausgangsverbindungen storende Nebenreaktionen verhindern, wurden molekulareinheitliche aus methylenverbruckter 4-Hydroxybenzoesaure bestehende Zwei- und Dreikernverbindungen hergestellt. Die Veresterung aller Carboxylgruppen in den Mehrkernverbindungen mit Athanol und bei einigen Verbindungen mit Methanol gab kristallisierte Ester. Alle phenolischen Hydroxylgruppen dieser Ester konnten auserdem acetyliert werden; auch diese gemischten Derivate waren kristallisiert. Hiernach sind fruhere Angaben zu der Zweikernverbindung 2.2′-Dihydroxy-5.5′-dicarboxydiphenylmethan und ihren Derivaten zu berichtigen. A special method which inhibits un…

Electroactivation of Transition Metal Redox Couples for the Carbonylation of Alcohols to Dialkylcarbonates

1998

Electrochemical systems which promote the carbonylation of methanol to dimethylcarbonate, based on the anodic activation of transition metal redox couples, or the Br−/Br2 couple, are poorly active for the carbonylation of ethanol to diethylcarbonate at room temperature and atmospheric pressure. Positive results have been obtained by combined addiction of PdBr2 and Bu4NBr to the system. In this way yields up to 50% in diethylcarbonate were obtained, with very good conductivities in long range electrolyses.

Über die zersetzung von hydroperoxyden durch katalase und durch lebereiweißfraktionen

1959

Es werden Herstellung und Eigenschaften einer Eiweisfraktion aus Rinderleber beschrieben, die auf Wasserstoffperoxyd, athyl-, Isopropyl- und tert.-Butylhydroperoxyd zersetzende Wirkung ausubt. Der fur das Zustandekommen der Zersetzungsreaktion der drei letzgenannten Peroxyde notwendige Acceptor wird als athanol identifiziert. Die Eiweisfraktion wird bezuglich ihrer Eigenschaften mit einer kristallisierten Katalase verglichen und aus dem Ergebnis der Schlus gezogen, das sie mit Katalase identisch ist. Als Reaktionsprodukt der enzymatisch katalysierten Reaktion zwischen tert.-Butylhydroperoxyd und athanol wurde Acetaldehyd nachgewiesen. The preparation and properties of an albumen fraction fr…

Buckwheat based substrate fermentation - possibilities for non-traditional alcoholic beverage production

2010

Potential use of pulsed electric technologies and ultrasounds to improve the recovery of high-added value compounds from blackberries

2015

Abstract A better knowledge of the effect of non-conventional extraction technologies, which can avoid the use of high temperatures and toxic solvents, on the antioxidant compounds recovery from blackberries, is necessary. Thus, high voltage electrical discharges (HVED), pulsed electric fields (PEF), and ultrasounds (USN) treatments were applied in order to evaluate the effects of processing on protein, total phenolics and anthocyanins extraction from blackberries. Moreover, two-stage extraction involving the use of HVED, PEF and USN as pre-treatments and supplementary extraction during 5 h with hot water at mild temperature (50 °C) or an hydroalcoholic solution (30% ethanol, w/w) was evalu…

Regioselektive Zinn(II)chlorid-induzierte N-Aralkoxy-alkylierung am 2,3-Dimethylindol

1986

2,3-Dimethylindole (1) reacts by tin(II)chloride catalysis with arylaldehydes in dichloromethane, which contains 0.2% ethanol, regioselectively to the indol-1-yl-aryl-ethoxy-methanes3 a, 3 b.

1982

1978

The synthesis and polymerization of 2-cyanoethyl N-vinylcarbamate (3b) and of the corresponding 2-trimethylsilylethyl isomer 3c are reported. The homopolymers 4b and 4c, derived from 3b and 3c, could be deblocked under mild conditions (ethanolamine for 4b and trifluoroacetic acid or tetraethylammonium fluoride for 4c) with essentially 100% unmasking of the amino function. Treatment of such unmasked amino groups in a copolymer derived from N-vinyl-2-pyrrolidone and 3b with 4-{4-[bis(2-chloroethyl)amino]phenyl}butyryl chloride (13) (chlorambucil chloride) gave the corresponding amide, a potential antitumor agent. Kinetic studies showed that fluoride ion cleavage of poly(2-trimethylsilylethyl …

Electrochemical Syntheses Involving Carbon Dioxide

1990

The recent developments of electrosynthetic processes involving carbon dioxide are reviewed. Both processes involving carbon dioxide alone and electrocarboxylations are taken under consideration. The first of these two fields, mainly projected towards the production of basic chemicals such as methanol or carbon monoxide, is at present at a stage of fundamental research. Some interesting developments have recently appeared in the literature, concerning the use of electrode materials, or of transition metal complexes with particular catalytic activity. Electrocarboxylations are at a stage of more applicative development: some processes have reached the stage of pilot plant, and other have int…