- SYNTHESIS OF tert-BUTYL- ANDD TRIFLUOROACETYL-SUBSTITUTED CARBAZOLES
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It has been shown that carbazole and its N-alkyl substituted derivatives are readily alkylated by a mixture of t-BuOH-CF3COOH to form 1,3,6,8-tetra- and 3,6-di(tert-butyl)-substituted carbazoles, respectively.Trifluoroacetylation of these compounds leads to 1-trifluoroacetylated compounds but 1,3,6,8-tetra(tert-butyl)carbazole undergoes ipso-substitution to form the 3-trifluoroacetyl derivative.
- Moskalev, N. V.
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- RECHARGEABLE LITHIUM-ION CELL
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A rechargeable lithium-ion cell has a cell capacity and includes a positive electrode having a recharged potential and a negative electrode. The rechargeable lithium-ion cell also includes a charge-carrying electrolyte. The charge-carrying electrolyte inc
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Paragraph 0068
(2017/06/30)
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- Preparation and study of 1,8-di(pyrid-2′-yl)carbazoles
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(Figure Presented) A series of three derivatives of 1,8-di(pyrid-2′- yl)carbazole were prepared by Stille-type coupling of 2-(tri-n-butylstannyl) pyridine with the appropriate 1,8-dibromocarbazole. The carbazoles were prepared by appropriate substitution methodologies on the parent carbazole or by palladium-catalyzed cyclization of di-(p-tolyl)amine to provide the carbazole ring system. An X-ray structure of the di-tert-butyl derivative confirmed that both pyridyl groups were oriented for favorable intramolecular H-bonding to the central N-H. Two orientations of the molecule were found in the unit cell and this observation was corroborated by two N-H stretching bands in the solid state IR. Substitution of N-H by N-D led to increased emission intensity through diminished intramolecular deactivation of the excited state. The di-tert-butyl derivative formed a tridentate complex with Pd(II), which showed a red-shifted band attributed to an intraligand charge transfer state.
- Mudadu, Maria S.,Singh, Ajay N.,Thummel, Randolph P.
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p. 6513 - 6520
(2008/12/22)
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- Synthesis and Structure of 1,3,6,8-Tetra-tert-butylcarbazole
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The synthesis of 1,3,6,8-tetra-tert-butylcarbazole (2) by the reaction of carbazole with tert-butyl chloride in the presence of aluminium chloride is reported.The X-ray structures of 2 and its diethyl ether adduct are compared.The gap formed by the tert-butyl groups in 1,8-position has been calculated and compared with that of the supermesityl substituent.1,3,6,8-Tetra-tert-butylcarbazole, Synthesis, Y-Ray
- Kuhn, Norbert,Schulten, Michael,Boese, Roland,Blaeser, Dieter
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p. 1503 - 1508
(2007/10/02)
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- ALKYLATION AND ALKENYLATION OF CARBAZOLE WITH ISOBUTYLENE AND PHENYLACETYLENE IN THE PRESENCE OF DIETHYLALUMINIUM CHLORIDE
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The reaction of carbazole with isobutylene and phenylacetylene in the presence of diethylaluminium chloride leads to the formation of ring-substituted alkyl and alkenyl derivatives of carbazole.The key stage in the synthesis of the obtained compounds is the formation of the intermediate N-aluminio derivative of carbazole.
- Kuznetsov, V. L.,Lopatinskii, V. P.,Filimonov, V. D.
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p. 1988 - 1991
(2007/10/02)
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