ChemInform Abstract: Phase‐Transfer of Potassium Hydroxide into Toluene in the Presence of Crown Ethers.

Kachurin, O. I.; Frolova, I. B.; Okhrimenko, Z. A.

doi:10.1002/chin.199005019

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“…DCl8C6 also efficiently extracts barium nitrate (16) and barium picrate (17) from neutral solutions into chloroform. Recently the transfer process of KOH into a toluene phase through solid phase KOH in the presence of DCl8C6 was described (18). Considering the similar ionic radii of K+ and ~a~+ cations (13), it might be possible to use DCl8C6 for the interfacial transfer of barium hydroxide.…”

Section: Syntheses Of 3-(n-alky1)-246-triphenylverdazyls 7n-fmentioning

confidence: 99%

Syntheses of 3-(substituted)-2,4,6-triphenylverdazyls

Katritzky¹,

Belyakov²,

Durst³

et al. 1994

Can. J. Chem.

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DURST, RUIXLN XU, and NARESH S. DALAL. Can. J. Chem. 72, 1849Chem. 72, (1994.Two series of 2,4,6-triphenylverdazyls substituted at the C(3) position of the heterocyclic ring are obtained using new convenient synthetic methodology. Thus, crown ether assisted solid-liquid phase-transfer catalysis promotes the formation of 3-nalkyl-substituted 2,4,6-triphenylverdazyls in the reactions of 1,3,5-triphenylformazan with n-alkyl bromides. Under PTC conditions, methylation of 3-(4-nitropheny1)-1,5-diphenylformazan with methyl iodide exclusively gives the corresponding verdazyl radical. 3-Substituted 2,4,6-triphenylverdazyls containing various di(cyclo)alkylamino moieties at the C (3) Chem. 72,1849Chem. 72, (1994. Faisant appel B une nouvelle mtthodologie de synthbse, on a obtenu deux series de 2,4,6-triphtnylverdazyles substituCs en position C(3) de l'htttrocycle. La catalyse par transfert de phase solide-liquide assistte par un tther-couronne favorise la formation des 3-n-alkyl-2,4,6-triphtnylverdazyles lors des rtactions des 1,3,5-triphtnylformazane avec des bromures de n-alkyles. Dans des conditions de transfert de phase, la mtthylation du 3-(4-nitrophCny1)-1.5-diphtnylformazane par l'iodure de mtthyle conduit uniquement au radical verdazyle correspondant. On a prtpare des 2,4,6-triphtnylverdazyles substituts par des portions di(cyclo)alkylamino en position (C)3 du cycle verdazyle en faisant rtagir du 1,3,5-triphCnylformazane avec les I-[N,Ndi(cyclo)alkylaminomtthyl]benzotriazoles correspondants en prtsence de monohydrate d'hydroxyde de baryum comme catalyseur efficace. La sonication de cette rtaction permet d'obtenir des rendements beaucoup plus tlevCs de verdazyles. On a synthttist un bis-verdazyle lit aux positions C(3) par deux N. On a caractCrisC tous les radicaux obtenus par des microanalyses, des spectres UV-visible et par spectroscopie RPE.[Traduir par la rtdaction]

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Section: Syntheses Of 3-(n-alky1)-246-triphenylverdazyls 7n-fmentioning

confidence: 99%