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Your search keyword '"Caubere, A."' showing total 17 results
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17 results on '"Caubere, A."'

1. Selective Demethylation and Demethoxy Thioalkylation of 5-Methoxyindoles

Author

Pierre Renard, Jean-Guy Bizot-Espiart, Paul Caubere, Catherine Caubere, and Brigitte Jamart-Grégoire

Subjects
Nucleophile, Chemistry, Organic Chemistry, Organic chemistry, Demethylation
Abstract

Under appropriate conditions, hard acid and soft nucleophile system lead to selective demethylation and demethoxy- thioalkylation of certain 5-methoxyindoles.

Published
1994

2. Easy Access to Cyclopentanoid Structures. 21Transposition of Tricyclo[m.n.0.02,m+1]alca-2,3,m+2-triol Derivatives

Author

Nicolas Brosse, Brigitte Jamart-Grégoire, Paul Caubere, Laboratoire d'Etude et de Recherche sur le Matériau Bois (LERMAB), and Université de Lorraine (UL)

Subjects
[CHIM.ORGA]Chemical Sciences/Organic chemistry, 010405 organic chemistry, Stereochemistry, Organic Chemistry, 010402 general chemistry, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, 0104 chemical sciences, Transposition (music), chemistry.chemical_compound, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Swern oxidation, Organic chemistry, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Triol, Methylene, ComputingMilieux_MISCELLANEOUS
Abstract

A new and expeditious synthesis of polycyclic hydroxycyclopentenones 4 is described. Thus diols coming from bis-hydroxylation of methylene cyclobutanols easily obtained from 1-chlorocyclenes, were transposed into 4 under Swern oxidation conditions followed if necessary by the basic treatment of the keto hydroxy ester formed.

Published
1995

3. Application of the Study of Reactivity of Alkaline Salts of Isocyanuric Acid to the Synthesis of Mono- and Trisubstituted Isocyanurates

Author

Muriel Chiron-Charrier and Paul Caubere

Subjects
Chemistry, Organic Chemistry, Nucleophilic substitution, Organic chemistry, Reactivity (chemistry), Isocyanuric acid
Abstract

Reactivity of alkaline salts of isocyanuric acid has been studied. It has been established that the nucleophilic substitution is not selective because of the protonic exchanges between salts and su...

Published
1993

4. An Efficient Cobalt Catalyzed Alkoxycarbonylation of Aryl and Heteroaryl Halides

Author

Régis Vanderesse, Paul Caubere, and Joël Marchal

Subjects
chemistry.chemical_compound, chemistry, Cobalt carbonyl, Aryl, Yield (chemistry), Organic Chemistry, chemistry.chemical_element, Halide, Organic chemistry, Alcohol, Carbonylation, Cobalt, Catalysis
Abstract

Cobalt carbonyl catalyzed carbonylation (1 atm) of aryl and heteroaryl halides may be easily achieved with CoCRACO in alcohol under photostimulation to afford the corresponding esters in high yield. Irradiation may be achieved very easily with a commercial sun lamp. Easy to prepare and handle on a preparative scale, CoCRACO must be regarded as very promising tool in the preparation of various esters.

Published
1993

5. A New Synthesis of Thiocyanatoalkyl (Meth)Acrylic Esters

Author

M. C. Berthe, Paul Caubere, and Yves Fort

Subjects
chemistry.chemical_compound, chemistry, Yield (chemistry), Potassium thiocyanate, Phase (matter), Organic Chemistry, chemistry.chemical_element, Meth, Iodine, Catalysis, Nuclear chemistry
Abstract

The selective synthesis of thiocyanatoalkyl meth(acrylic) esters were obtained with 71 to 95 % yield under phase transfer catalysis from corresponding chloro- and bromoalkyl (meth)acrylic esters and potassium thiocyanate in presence of potassium iodide.

Published
1992

6. Selective Reduction of the Carbonyl Group of Functional Nitroaromatic Derivatives: A New Application of Complex Reducing Agents ZnCRASi

Author

Yves Fort, Paul Caubere, Régis Vanderesse, and G. Feghouli

Subjects
chemistry.chemical_compound, chemistry, Reducing agent, Organic Chemistry, chemistry.chemical_element, Organic chemistry, Selective reduction, Zinc, Carbonyl group
Abstract

The selective reduction of carbonyl group of aromatic nitroketones or aldehydes into aromatic nitroalcohols has been achieved by Me3SiCl modified Zinc containing Complex Reducing Agent (ZnCRASi).

Published
1990

7. Stereoregularity of Poly(methyl Methacrylate) Obtained by New Complex Bases

Author

Gilberte Ndebeka, Serge Raynal, Paul Caubere, Joseph Sledz, and François Schué

Subjects
chemistry.chemical_compound, Materials science, chemistry, Tacticity, visual_art, Polymer chemistry, General Engineering, visual_art.visual_art_medium, Organic chemistry, Methyl methacrylate, Spectroscopy, Methacrylate, Poly(methyl methacrylate)
Abstract

The stereoregularity of poly(methyl methacrylate) obtained with complex bases in various solvents was determined by 1H-NMR spectroscopy. Polymethyl methacrylates produced by complex bases are mostly hetero and/or syndiotactic and obey Bernoullian statistics.

Published
1982

8. Steroregularity of Polystyrenes Obtained by New Complex Bases

Author

Gilberte Ndebeka, Paul Caubere, Satira Suparno, François Schué, Joseph Sledz, and Serge Raynal

Subjects
chemistry.chemical_classification, chemistry, Tacticity, Polymer chemistry, General Engineering, Salt (chemistry), Spectroscopy
Abstract

The stereoregularity of polystyrenes obtained with complex bases and salt complex bases in various solvents was determined by 13C-NMR spectroscopy. Polystyrenes produced by complex bases are mostly syndiotactic and obey Bernoullian statistics.

Published
1982

9. Salt Complex Bases as New Initiators in the Polymerization of Methyl Methacrylate

Author

F. Schué, Paul Caubere, Serge Raynal, Joseph Sledz, and Gilberte Ndebeka

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Materials science, chemistry, Polymerization, Polymer chemistry, General Engineering, Organic chemistry, Salt (chemistry), Methyl methacrylate, Spectroscopy
Abstract

The stereoregularity of poly(methyl methacrylate)s obtained with salt complex bases (MNH2-MZ) in various solvents was determined by 1HMR spectroscopy. Poly(methyl methacrylate)s produced by salt complex bases are mostly heterotactic and obey Bernoullian statistics.

Published
1983

10. Arynic Condensation of Nitrile Anions in the Presence of the Complex Base NaNH2-CH3CH2(OCH2CH2)2ONa

Author

Philippe Geoffroy, Paul Caubere, A. S. Ezzinadi, M. C. Carre, and M. A. Zouaoui

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, chemistry, Base (chemistry), Nitrile, Aryl, Organic Chemistry, Polymer chemistry, Condensation, Halide, Nitrite, Photochemistry, Aryne
Abstract

Nitrite anions are easily condensed with aryl halides in the presence of the Complex Base NaNH2-CH3CH2(OCH2CH2)2ONa via the intermediate arynes.

Published
1989

12. Arynic Condensation of Ketone Enolates XX. New Access To Polycyclic Phenylethanolamines

Author

Philippe Geoffroy, M.C. Carre, A. A. Aatif, and Paul Caubere

Subjects
chemistry.chemical_classification, Ketone, chemistry, Organic Chemistry, Condensation, Organic chemistry
Abstract

A new preparation of two kinds of potentially biologically active phenylethanolamines is described. The basic reaction of these syntheses is arynic condensation of ketone enolates in the presence of Complex Bases.

Published
1989

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