Synthèse du 1,3-diméthyl-4,5-méthylénéphénanthrène. Contribution à l'étude de la structure de 3,5-diméthylpyrène

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Effets de Solvant sur la Fréquence de Vibration «Stretching» OH et NH de plusieur alcools et amines

A discussion of solvent effect upon the streching frequency of Y‐H bonds in correlation with their basicity is reported. The following bonds are studied: O‐H in primary, secondary and tertiary alcohols; N‐H in aliphatic and aromatic amines; and cyclic N‐H where the free electron pair of nitrogen is delocalized in an aromatic π electron system, such as in indole derivatives. The measurements are extended to some indole alcaloïds of known structure. Copyright © 1962 Wiley‐VCH Verlag GmbH & Co. KGaA, WeinheimSCOPUS: ar.jinfo:eu-repo/semantics/publishe

Spectres 13C - nmr De Quelques GlutarimiDes Substitues EN α ET EN β.

C-nmr spectra of a and β glutarimides have been determined and analyzed. Assignments related to the imidocarbonyls are discus sed. © 1973, Taylor & Francis Group, LLC. All rights reserved.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Synthèses Dans Le Domaine Des Composés Polycycliques Aromatiques XXII. 1,3‐Diméthyl‐4,5‐Méthylènephénanthrène (1,3‐Diméthyl‐4H‐Cyclopenta[def]Phénanthrène)

1,3‐dimethyl‐4,5‐methylenephenanthrene has been synthesized in two different ways, starting from 1‐acenaphtylsuccinic anhydride. A stereochemical interpretation of anomalous reactions is proposed. Copyright © 1961 Wiley‐VCH Verlag GmbH & Co. KGaA, WeinheimSCOPUS: ar.jinfo:eu-repo/semantics/publishe

Synthesis of 1,2,4,6,7,11b-hexahydrobenzo[a]quinolizin-3-one and of some related compounds

High yield syntheses of 3-ethylidene-1,2,4,6,7,11b-hexahydrobenzo[a] quinolizine and the corresponding 3-ketone, and of 3-ethyl-2,3,4,6,7,11b- hexahydro-1H-benzo[a]quinolizine, are described, starting from 1-ethoxycarbonyl-methyl-3,4-dihydroisoquinoline.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Spectres de masse de quelques médicaments à action parasympatholytique périphérique dérivés du 1,3-propanol

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Physico-chemical study of indole alkaloids models1) V. Study of the stereochemistry of quinolizidine derivatives by measurement of association constants with phenol and 2,6-dimethylphenol

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Étude Physico‐Chimique de Modèles D'Alcaloides Indoliques I. Considérations préliminaires concernant la structure d'analogues d'alcaloïdes indoliques et de dérivés du bicyclo [2, 2, 2] octane et du 1‐azabicyclo [2, 2, 2] octane (quinuclidine)

In order to study the thermodynamic stability of the ethylidene side chain in a bridged bicyclic system, as it is found in certain alkaloids, we have prepared the following compounds: 2‐ethylidene bicyclo [2, 2, 2] octane, 2‐ethylbicyclo [2, 2, 2] oct‐2‐ene, 3‐ethyl‐1‐azabicyclo [2, 2, 2] oct‐2‐ene and 3‐ethylidene‐1‐azabicyclo [2, 2, 2] octane. From the results of the dehydratation of the 2‐ethylbicyclo [2, 2, 2] octan‐2‐ol and 3‐ethyl‐1‐azabicyclo [2, 2, 2] octan‐3‐ol, made in the same conditions as in acid catalysed isomerization, the following figures are obtained: ) series of bicyclo [2, 2, 2] octane: 30% of endocyclic alkene and 70% of semicyclic alkene; ) series of 1‐azabicyclo [2, 2, 2] octane: 25% of endocyclic alkene and 75% of semicyclic alkene. These figures show the peculiar stability of a semicyclic double bond with respect to an endocyclic double bond in 1, 4 bridged bicyclic compounds. Copyright © 1964 Wiley‐VCH Verlag GmbH & Co. KGaA, WeinheimSCOPUS: ar.jinfo:eu-repo/semantics/publishe

VII. Physico-chemical study of models of indole alkaloids confirmation of the assignment of the geometry of the two isomeric 3-ethylidene-1-azabicyclo [2,2,2] octane by the study of the nuclear overhauser effect (NOE).

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