Vincent Maisonneuve

Crystal chemistry and selected physical properties of inorganic fluorides and oxide-fluorides.

importance in the development of many new technologies, and are impacting various key points of modern life, that is, energy production and storage, microelectronics and photonics, catalysis, automotive, building, etc. Many research fields and applications are indeed concerned by a better knowledge of the relationships occurring between the structure of such compounds and some pertinent physical properties. This Review deals with the structural chemistry of solid-state inorganic fluorides and oxide-fluorides, mostly transition metal-based, including rare-earth elements. Such a Review has not been published for a long time.1 Articles that recently appeared on inorganic fluorinated compounds were mostly focused on material science characteristics: morphology, surface functionalization, nanostructuration of the materials and applications, rather than on the description of characteristic structural features.2−5 Detailed reviews focused on rare earthbased inorganic fluorides have also appeared some years ago...

Synthesis from solutions and properties of various metal fluorides and fluoride salts

Abstract Parts of the recent advances in the search of new fluorides or fluoride salts, at the Laboratoire des Fluorures in Le Mans, are presented. Hydrothermal synthesis in sub-critical or super-critical conditions is mainly used to obtain rare earth (RE), Al, Ga, In or 3d transition fluorides or fluoride salts (borates, carbonates, phosphates or silicates). Open structures are obtained by low temperature crystallisation from solutions (δ-(H 3 O)RE 3 F 10 · x H 2 O) and, probably, by decomposition of hybrid organic–inorganic fluorides D·MF 5 (D=diprotonated aliphatic diamine), prepared by micro-wave heating of the solutions. Non-centrosymmetric phases are evidenced in fluoride carbonates and fluoride borates: K 4 RE 2 (CO 3 ) 3 F 4 and M 2 (BO 3 )(OH) 0.75 F 0.25 ; the magnetic properties of several iron fluoride phosphates are found to be governed by super or super-superexchange interactions.

A [4+2] heterocycloaddition route to (′)-9-decanolides

A convergent synthetic pathway for access to the functionalized (′)-9-decanolides is described, using a [4+2] bicyclic heterocycloadduct as the key intermediate. Thus, the exo adduct (′)-10 led to the hemiacetal (′)-14a via a 4-step sequence. Free radical oxidation of (′)-14a by means of iodine and iodosobenzene diacetate under UV light gave the model 9-decanolide (′)-15 in 53% yield.