Epalons: Synthesis of New 16α-Carboxymethyl Derivatives

1999 ◽  
Vol 64 (9) ◽  
pp. 1479-1484 ◽  
Author(s):  
Barbora Slavíková ◽  
Alexander Kasal
Keyword(s):  
Formic Acid ◽  
Conjugate Addition ◽  
Dimethyl Malonate ◽  
Diethyl Azodicarboxylate

The title compounds (16α-carboxymethyl-3α-hydroxy-5α-pregnan-20-one and its sodium and triethylammonium salts) were prepared from 20-oxopregna-5,16-dien-3β-yl acetate by conjugate addition of dimethyl malonate and decarboxylation. Inversion of configuration at carbon C-3 was carried out by Mitsunobu acylation with diethyl azodicarboxylate and formic acid in the presence of triphenylphosphine.

Studies on gibberellin synthesis. The preparation of phenanthrenoid intermediates for the synthesis of gibberellin A21

1981 ◽  
Vol 34 (9) ◽  
pp. 1913 ◽  
Author(s):  
LN Mander ◽  
GJ Potter ◽  
SG Pyne ◽  
M Woolias
Keyword(s):  
Conjugate Addition ◽  
Dimethyl Malonate ◽  
Conventional Methods

Methyl 3-(6'-oxo-4'-methoxy-5',6',7',8'-tetrahydronaphthalen-1'-yl)propanoate (11) was converted by conventional methods into diazoketone (17) which underwent acid-promoted cyclization to dienone (18). Refunctionalization gave dienone (20) which was subjected to a tandem alkylation, conjugate addition process with the sodium enolate of dimethyl malonate to furnish a 2: 1 mixture of dimethyl (2RS,8aSR,10aSR)-2-methoxymethyloxy-10,12-dioxo-2,3,4,5,6,7,8a,9,10-decahydro-1 H-2,10a-ethano- phenanthrene-8,8-dicarboxylate (21) and its 8a-epimer, respectively. Subsequent manipulations led to lactone (26), but attempts to convert this compound into a gibbane derivative were unsuccessful.

NANOELECTROCATALYSTS BASED PALLADIUM FOR FUEL CELLS WITH DIRECT OXIDATION OF FORMIC ACID

2019 ◽  
Vol 6 (3) ◽  
pp. 104-107
Author(s):  
Marina Vladimirovna Lebedeva ◽  
Alexey Petrovich Antropov ◽  
Alexander Victorovich Ragutkin ◽  
Nicolay Andreevich Yashtulov
Keyword(s):  
Formic Acid ◽  
Palladium Nanoparticles ◽  
Oxidation Reaction ◽  
Electrode Materials ◽  
Formic Acid Oxidation ◽  
Energy Sources ◽  
Acid Oxidation ◽  
Direct Oxidation ◽  
Atomic Force ◽  
Formic Acid Oxidation Reaction

In paper electrode materials with palladium nanoparticles on polymer matrix substrates for energy sources have been formed. Nanocomposites were investigated by atomic force and scanning electron microscopy. The catalytic activity of formed electrodes in the formic acid oxidation reaction was evaluated by voltammetry method.

THE JET-COOLED HIGH-RESOLUTION IR SPECTRUM OF FORMIC ACID CYCLIC DIMER

2017 ◽  
Author(s):  
Manuel Goubet ◽  
Robert Georges ◽  
P. Roy ◽  
Atef Jabri ◽  
Pascale Soulard ◽  
...  
Keyword(s):  
High Resolution ◽  
Formic Acid ◽  
Ir Spectrum ◽  
Cyclic Dimer
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