Search results for "Raney nickel"

An efficient and practical synthesis of [2-11C]indole via superfast nucleophilic [11C]cyanation and RANEY® Nickel catalyzed reductive cyclization

2015

A rapid method for the synthesis of carbon-11 radiolabeled indole was developed using a sub-nanomolar quantity of no-carrier-added [(11)C]cyanide as radio-precursor. Based upon a reported synthesis of 2-(2-nitrophenyl)acetonitrile (), a highly reactive substrate 2-nitrobenzyl bromide () was evaluated for nucleophilic [(11)C]cyanation. Additionally, related reaction conditions were explored with the goal of obtaining of highly reactive 2-(2-nitrophenyl)-[1-(11)C]acetonitrile () while inhibiting its rapid conversion to 2,3-bis(2-nitrophenyl)-[1-(11)C]propanenitrile (). Next, a RANEY® Nickel catalyzed reductive cyclization method was utilized for synthesizing the desired [2-(11)C]indole with h…

Zur darstellung von phenolalkoholen aus phenolaldehyden mit wasserstoff/RANEY-nickel und aus phenolcarbonsäureestern mit LiAlH4

1963

Man kann Phenolaldehyde mit Wasserstoff/RANEY-Nickel entgegen Angaben in der Literatur auch bei Zimmertemperatur und Atmospharendruck zu Phenolalkoholen in guten Ausbeuten reduzieren. Die Reduktion von Phenolcarbonsaureestern mit LiAlH4 ist eine brauchbare Methode, um empfindliche und sonst nur schwer und mit geringen Ausbeuten erhaltliche Phenolalkohole mit verbesserter Ausbeute zu erhalten. It is possible to prepare phenol alcohols in good yields by reduction of phenol aldehydes with hydrogen in the presence of RANEY nickel and even at room temperature and normal pressure contrary to literature references. The reduction of phenol carboxylic acid esters by LiAlH4 is a suitable preparation …

Oczyszczanie ścieków w mikrobiologicznym ogniwie paliwowym z katodą z niklu Raneya

2016

UV-Photometrische Analyse kationisch erzeugter Polystyrole, 2. Quantitative Bestimmung von Endgruppen in Polystyrolen, dargestellt mit Acylperchlorat…

1984

Acyl perchlorates generated in styrene without a solvent by acyl chlorides and silver perchlorate gave polystyrenes with covalently bonded acyl groups. In order to gain secured values their number average relative molecular masses (Mn) were determined by different methods. The polystyrenes could be hydrogenated with hydrogen and Raney nickel at room temperature and under atmospheric pressure without attacking the phenolic nuclei. In addition IR data and a UV absorption at 294 nm of the polystyrenes revealed the presence of and olefinic bond, which was also found in a polystyrene obtained by polymerisation with perchloric acid. Also the quantitative evaluation of the hydrogeneation by UV abs…