Cellules d'electrolyse a circulation. montages particuliers et applications a des reactions electrochimiques consecutives et opposees

N-Substituted 1-Aminoindoles from Electrogenerated N-Substituted 2-(ortho-Nitrosophenyl)ethylamines

“…Controlled-potential electrolyses were performed at a mer-8b؊d is higher than in acidic media, thus only a part of cury pool cathode, under nitrogen atmosphere, in a cell described 8b؊d undergoes cyclization at the anode to 11b؊d, giving previously. [19,20] Two working electrodes (5.2 cm cyclizes after leaving the anode, leading to intermediates diameter, 12 mm thickness for cathode and 6 mm thickness for 11b؊d, ring-contraction of which gives the N-alkyl-1-amianode) were made of graphite felt (Le Carbone Lorraine). "Redox" electrolyses were per-15b؊d and the corresponding hydrolysis products (2 and 1) formed at controlled current, under nitrogen atmosphere, in a flow as by-products (vide supra).…”

“…The electrolysis of 6e in the same medium was also performed in a "redox" flow cell [19,20] fitted with two consecu-The steric effects of the substituent on the N-ethylamine affected the rate of cyclization more strongly than in the tive porous graphite felt electrodes of opposite polarities (Scheme 2), enabling rapid oxidation at the second porous benzylamine series. In acidic and basic aqueous alcoholic media, we observed the quasi reversibility of the nitroso-electrode of the hydroxylamine 7e produced at the first.…”

Electrosynthesis of nitroso compounds from (1S, 2S)-2-amino-l-(4-nitrophenyl)-propane-1,3-diol derivatives

“…However, using a ''redox'' flow cell fitted with two consecutive porous electrodes of large specific area (graphite felt), the hydroxylamine intermediate produced in good yields at the first porous electrode (cathode) can be quickly (few seconds) [1] and totally oxidized into the nitroso derivative at the second porous electrode (anode) avoiding any chemical evolution. In this case, electrosyntheses in a ''redox'' flow cell of nitroso derivatives from the corresponding nitro compounds were performed in methanol containing acetate buffer (0.5 M CH 3 CO 2 H + 0.5 M CH 3 CO 2 Li) as electrolyte.…”

“…''Redox'' electrolyses were performed in galvanostatic regime using a flow cell as described previously [1,5]. Two closely consecutive working electrodes (4 cm diameter, 12 mm thickness for cathode and 6 mm thickness for anode) were made of graphite felt (RVG 4000, Le Carbone Lorraine).…”

“…Over the past few years, an electrochemical ''redox'' methodology using a flow cell equipped with two consecutive porous electrodes of opposite polarities, has been developped, whereby nitroso compounds can easily be obtained in excellent yields, in protic media, according to Scheme 1 [1][2][3][4][5][6][7][8][9][10][11][12]. We have used this procedure to prepare nitroso compounds resulting from (1S, 2S)-2-amino-l-(4-nitrophenyl)-propane-1,3-diol derivatives (derivatives of p-nitro-phenylserinol).…”