Jacques Bellan

A general method for preparing diphosphiranes

Abstract Diphosphiranes 3a - 3f are obtained by action of diazo derivatives and carbenes on the trans-diphosphene 1 . The structures are elucidated by spectroscopic methods. In all cases the cycloaddition reaction is stereoselective.

Nem method of obtaining a stable diphosphirane

Abstract The stable monomer diphosphirane 2 is produced by the reaction of the diazomethane on the diphosphene 1 .

Synthesis, structure and bonding properties of 3-phosphoindoles analogues of group 15

Abstract We present the synthesis and the characterization of new benzazadiphospholes 3, 4 and the parent compounds 5 and 6 with a P=As and a P=Sb double bond. The theoretical calculations, the photoelectron spectra and the reactivity of 2 are also discussed.

New podands and macrocycles containing “dioxazaphosphocane” moieties. Synthesis, structural determination and study of their binding and ionophoric properties with Ca2+ and Mg2+ cations

Abstract The reactions of diacids with the bicyclophosphane 1 lead to podands 3a-f in which two dioxazaphosphocane moieties are linked by a more or less rigid spacer owing to the starting diacid. Macrocycles 4a-b are obtained by cyclization of podands 3a-b by way of Michaelis-Becker reaction. The formation of Ca 2+ and Mg 2+ complexes with 3a-f and 4a-b has been investigated by UV, IR and NMR spectroscopies. Liquid-liquid extraction studies show for macrocycles efficient extracting properties and good selectivities of Ca 2+ towards Mg 2+ . The calcium transport across a chloroformic membrane agrees better with stability constants than with extraction data.

Synthese du premier 1,2,3-benzazadiphosphole a double liaison PP stable

Abstract The first benzazadiphosphole 4 with an intracyclic phosphorus phosphorus double bond was obtained starting from the anilino 2 phosphine. The stability of 4 is due to the aromaticity of the fused cycles. 4 has been isolated and characterized by its physico-chemical data ; it reacts according to a [4+2] cycloaddition with the dimethylbutadiene.

A SIMPLE AND CONVENIENT SYNTHESIS OF 2-PHOSPHONOMETHYL PYRIDINES

Abstract The Michaelis-Becker-Nylen reaction is well suited for the synthesis of 2-phosphonomethyl pyridines. We have improved this four steps method in a one pot reaction using commercial reagents. By this general procedure we have prepared seven new 2-phosphonomethyl pyridines (Ia—g) under mild conditions with higher yields.

Reactivity of Diphosphene towards Oxygen and Diazo Derivatives: New Method of Obtaining Stable Diphosphiranes

Abstract Different aspects of the reactivity of the diphosphene are presented: reactivity of the lone pair and/or reactivity of the double bond.

SYNTHESE DE NOUVEAUX MACROCYCLES DERIVES DE LA QUINOXALINE-2 3-DITHIONE SYNTHESIS OF NEW MACROCYCLES FROM QUINOXALINE-2, 3-DITHIONE DERIVATIVE

Abstract Au cours de ce travail, nous décrivons la synthtse de nouveaux macrocycles renfermant une ou deux unités quinoxaliniques au sein dune chaìne poléthérée et thioétheérée, susceptibles de présenter des propriétés complexantes intéressantes, et dont le principe consiste à faire réagir la quinoxaline-2, 3- dithione avec les dichloropolyéthyléneglycols dans les conditions de la catalyse par transfert de phase

Nouveaux Cations Phosphores A Enchainement P—N—PN+ (N = 1.2) Comportant Les Coordinences 2,3 Et 4 Du Phosphore

Abstract Novel recent results with mono- and bisphosphocations of P—N—-P compounds are reported.

Synthèse et mise en évidence par spectrométrie de masse (FAB) des propriétés complexantes du 2-(5-méthyl-1-pyridin-2-yl-pyrazol-3-yl)méthyl benzimidazole et d'une réaction d'oxydation par l'oxygène moléculaire

Abstract New aza heterocycles with benzimidazole, pyrazole and pyridine moieties in the same molecule have been prepared. Preliminary complexing properties with divalent copper salts were determined by means of mass spectrometry (FAB) and a very interesting oxydation reaction with molecular oxygen was shown.