Search results for "Sodium"

ChemInform Abstract: Light Induced C-C Coupling of 2-Chlorobenzazoles with Carbamates, Alcohols, and Ethers.

2016

A light induced, transition-metal-free C-C coupling reaction of 2-chlorobenzazoles with aliphatic carbamates, alcohols, and ethers is presented. Inexpensive reagents, namely sodium acetate, benzophenone, water, and acetonitrile, are employed in a simple reaction protocol using a cheap and widely available 25 W energy saving UV-A lamp at ambient temperature.

Untersuchungen zum oxidativen Abbau nativer Cellulose, 2. Einfluß der Alkalibehandlung auf die Viskositäts-Molekulargewichts-Beziehungen

1974

Um die Kinetik des oxidativen Abbaus nativer Cellulose viskosimetrisch verfolgen zu konnen, mussen neue [η]-M-Eichbeziehungen aufgestellt werden, da die Behandlung der Cellulose mit konzentriertem Alkali den Staudingerindex [η] erniedrigt, ohne das Molekulargewicht M zu verandern. Es wurden zwei Reihen oxidativ abgebauter, verschieden lange mit Alkali vorbehandelter Cellulosen hergestellt und an diesen die Konstanten der Kuhn-Mark-Houwink-Gleichung fur die Cellulosenitrate in Aceton und die Cellulosen in Cuoxam (Cu(NH3)4(OH)2) durch Vergleich mit Lichtstreuungsmessungen bestimmt. For kinetic studies of cellulose degradation by molecular oxygen it is necessary to establish new [η]-M-relation…

Über katalytische einflüsse bei der polykondensation des p-kresoldialkohols

1952

Wird natriumfreier p-Kresoldialkohol in Silber- oder Platingeraten bei 130°C kondensiert, so ist durch den Geruch kein Formaldehyd wahrnehmbar. p-Kresoldialkohol enthalt oft von seiner Darstellung uber das Natriumsalz her geringe Mengen an Natrium, dessen Anteil im Bereich von 0,0 bis 5,00/00 liegt (0,000 bis 0,037 Mol Natrium je Mol Phenolalkohol). Die bei der Hartung des p-Kresoldialkohols in Platin- oder Silbergeraten beobachteten Gewichtsverluste und die Formaldehydabspaltung sind umso hoher, je groser der Natriumgehalt ist. Natriumfreier p-Kresoldialkohol in Gefasen aus Jenaer Gerateglas 20 und aus gewohnlichem Glas gehartet zeigt in Ubereinstimmung mit der Abgabefahigkeit an Alkali de…

N,N-Dimethylformamide Diethyl Acetal

2001

(1; R1 = Et, R2 = Me) [1188-33-6] C7H17NO2 (MW 147.25) InChI = 1S/C7H17NO2/c1-5-9-7(8(3)4)10-6-2/h7H,5-6H2,1-4H3 InChIKey = BWKAYBPLDRWMCJ-UHFFFAOYSA-N (2; R1 = Me, R2 = Me) [4637-24-5] C5H13NO2 (MW 119.19) InChI = 1S/C5H13NO2/c1-6(2)5(7-3)8-4/h5H,1-4H3 InChIKey = ZSXGLVDWWRXATF-UHFFFAOYSA-N (3; R1 = PhCH2, R2 = Me) [2016-04-8] C17H21NO2 (MW 271.39) InChI = 1S/C17H21NO2/c1-18(2)17(19-13-15-9-5-3-6-10-15)20-14-16-11-7-4-8-12-16/h3-12,17H,13-14H2,1-2H3 InChIKey = JFIKHFNGAURIIB-UHFFFAOYSA-N (4; R1 = Et, R2 = Et) [22630-13-3] C9H21NO2 (MW 175.31) InChI = 1S/C9H21NO2/c1-5-10(6-2)9(11-7-3)12-8-4/h9H,5-8H2,1-4H3 InChIKey = AYZXEGOJMRKZCV-UHFFFAOYSA-N (mild and selective reagents for alkylation, f…

FIA-Fluorimetric assembly for the determination of noradrenaline hydrochloride by a solid-phase reactor with immobilized hexacyanoferrate(III)

1997

An FIA assembly provided with immobilized hexacyanoferrate(III) is proposed for the fluorimetric determination of noradrenaline hydrochloride. The oxidative reagent is immobilized by means of a strong anion-exchange resin. The FIA manifold is very simple and the calibration graph is linear over the range 0.5–75mgl−1 noradrenaline hydrochloride with an r.s.d of 0.88% (17 replicates) and a sample throughput of 84h−1. Foreign compounds such as NaCl, sucrose, lactose and sodium sulfate caused no significant errors. The procedure is applied to the determination of noradrenaline in a medicinal formulation.

4-Chloro-1,1-diphenyl-3-(1-pyrrolyl)-2-azabuta-1,3-diene

2002

The title compound, C19H15ClN2, is the sole stable product resulting from nucleophilic attack of the sodium salt of pyrrole on 4,4-di­chloro-1,1-di­phenyl-2-aza­buta-1,3-diene. The mech­an­ism of its formation is briefly discussed.

ChemInform Abstract: ortho Effect on the Nitrosation of the 2,3-Diphenyl-5-(2-methoxyphenyl)pyrrole.

1990

A comparison of the behaviour on the nitrosation of the isomers 5-(2-methoxyphenyl)- (1a) 5-(3-methoxyphenyl)- (1b) and 5-(4-methoxyphenyl)2,3-diphenylpyrroles (1c) carried out in the usual way with iso-amyl nitrite in a solution of sodium ethoxide in ethanol evidences that 1a is dramatically less reactive with respect to 1b and 1c. The different reactivity was ascribed to the occurrence of a strong hydrogen bond involving pyrrole NH and the ortho-methoxy group.

orthoeffect on the nitrosation of the 2,3-diphenyl-5(2-methoxyphenyl)pyrrole

1990

A comparison of the behaviour on the nitrosation of the isomers 5-(2-methoxyphenyl)- (1a) 5-(3-methoxyphenyl)- (1b) and 5-(4-methoxyphenyl)2,3-diphenylpyrroles (1c) carried out in the usual way with iso-amyl nitrite in a solution of sodium ethoxide in ethanol evidences that 1a is dramatically less reactive with respect to 1b and 1c. The different reactivity was ascribed to the occurrence of a strong hydrogen bond involving pyrrole NH and the ortho-methoxy group.

Stability in physiological saline of intravenous busulfan in a polyolefin pack

2008

Abstract Introduction Although it has been used orally, the variability in its absorption and the risk of causing vomiting has lead to a push towards the intravenous use of busulfan. This study looks at the stability of 60 mg of busulfan, in fixed volumes of 250 mL (0.24 mg/mL) and 500 mL (0.12 mg/mL) of physiological saline and different conservation conditions, in a new plastic pack made from polyolefin/polyamide laminates. Material and methods High-performance liquid chromatography with ultraviolet detection was used to determine the concentration of busulfan derivate with sodium diethyldithiocarbamate trihydrate. Stability was assessed for both concentrations; refrigerated and at room t…

Computer Simulation of Molten and Glassy Silica and its Mixtures with Sodium Oxide and Aluminium Oxide

2007