Henriette Riviere

Selective oxidation of saturated hydrocarbons using an electrochemical modification of the gif system.

Abstract The Gif system for selective hydrocarbon oxidation can be carried out replacing the zinc by a cathodic electrochemical reduction; the yields obtained and the selectivities observed are very similar.

An efficient electrochemical process for the oxidation of saturated hydrocarbons: the Gif–Orsay system

The selective oxidation of saturated hydrocarbons can be carried out using triplet oxygen, pyridine, trifluoroacetic acid, and an iron catalyst in an unicellular electrochemical cell (Gif–Orsay system), cyclododecane, adamantane, and cyclo-octane being oxidised in 17–30 mmolar amounts with improved coulombic yields of up to ∼30% being attainable; oxidation of cyclohexane in 48 mmolar amounts gave cyclohexanone with some cyclohexanol in ∼40% coulombic yield, and similar yields were obtained on a 140–167 mmolar scale (saturated solution of hydrocarbon) with addition of electron transfer reagents and enough water to give two layers (good stirring) and satisfactory conductivity.

Tuning of reactivity in epoxidation of alkenes by iron and ruthenium complexes associated to non-porphyrinic ligands

RuCl3·n(H2O) or FeSO4 associated with bipyridyl or substituted phenanthrolines, catalyse the expoxidation of stilbenes by IO4– or ClO–; using phenanthrolines bearing electron donating or withdrawing groups, it is possible to modulate the reactivity of these systems.

Influence de certains ligandes sur le processus d'addition de cuprates lithiques ou magnesiens

Abstract Tetracyanoethylene decreases the rate of 1,4 addition of magnesium diphenylcuprate to 1-mesityl-3-methyl-2-butenone but decomposes the lithium diphenylcuprate, while triphenylphosphine (TPP) increases the rate of 1,4 addition of lithium diphenylcuprate but decomposes magnesium organocuprates giving Grignard reagents and a new complex CuX(TPP) 3 . For a cuprate obtained from 2 RMgX′ and CuX″, the halogen X, present in the CuX(TPP) 3 complex, is the softer of X′ or X″.

Transformation des chlorures d′acides aromatiques en cetones a l′aide d′organocuivreux et d′organocuprates, mise en evidence d′un complexe intermediaire

Abstract The synthesis of acetophenone from benzoyl chloride by means of organocopper(I) compounds and organocuprates takes place in two stages via an intermediate, some properties of which have been examined in the particular case of CH 3 MgI + CuI.

Palladium-catalysed reaction of tributyltin hydride with acyl chlorides. A selective route to aldehydes

In the presence of catalytic amounts of tetrakis(triphenylphosphine)palladium, tributyltin hydride rapidly and selectively reduces acyl chlorides to aldehydes under very mild conditions.