The industrially important alkyl aryl ethers, of which anisole is the simplest form, can be synthesized by reacting the corresponding phenols with the environmentally benign dimethyl carbonate (DMC). The reaction is carried out under mild conditions of temperature and pressure. Excellent yields and selectivity of product were obtained after a few hours of reaction.

La sulfonation de diphosphines de type-1,2, 1–3 et 1–4 (dppe, dppp, dppb) est ttudite. II est montré que la sulfonation est plus rapide pour les diphosphines-1,4 que pour les diphosphines-1,3 et 1,2. Les conditions permettant d'accéder à la tétrasulfonation sont précisées, ainsi que celles conduisant à un mélange riche en phosphées disulfoées. Cette étude a été étendue aux diphosphines chirales (Cyclobutanediop. BDPP, Chiraphos). The sulfonation of 1,2, -1,3 and -1,4 diphosphines (dppe, dppp, dppb) is studied. It is shown that the sulfonation is faster for 1,4-diphosphines than for -1,3 and -1,2 diphosphines. The conditions affording the tetrasulfonation are described, and also those allowing the obtention of a mixture containing large amounts of disulfonated diphosphines. This study is extended to chiral diphosphines (Cyclobutanediop, BDPP, Chiraphos).

AbstractThe sulfonation of (I) is carried out with SO3/H2SO4 at 25 °C and occurs stepwise at the m‐position of the phenyl substituents.

AbstractSulfonation of chiral bis(diphenylphosphines) e.g. (I) results in water‐soluble ligands.

For the reduction of dehydro aminoacids in various media with rhodium complexes containing chiral ligands, a linear correlation of log %S/%R with the solvophobicity parameter Sp has been observed. The decrease in enantioselectivity in water is due to the high interfacial energy of this solvent.

The syntheses of three triphenylphosphine analogues with one, two or three phenyl groups replaced by 2-dibenzofuranyl groups, respectively, and one enantiopure analogue of the atropisomeric diphosphine MeO-BIPHEP with all four phenyl groups replaced by 2-dibenzofuranyl are reported. Sulfonation of these compounds with sulfuric acid at rt proceeded with complete regioselectivity at the 8-position in the dibenzofuran moieties. These results proved the usefulness of dibenzofuran as a structural moiety in the synthesis of water-soluble phosphine ligands.The dibenzofuran-based, water-soluble triphenylphosphine analogues were used as ligands in palladium-catalysed aqueous phase Heck and Suzuki reactions and in the rhodium-catalysed two-phase hydroformylation of propene.

This paper reports on results obtained on molded sheets of rigid PVC containing up to 1.5% of ferrocene by weight of polymer. Thermogravimetric and flash pyrolysis in combination with gas chromatographic analysis showed that the introduction of such small quantities of ferrocene considerably increases the amount of low molecular weight volatile materials and simultaneously decreases the amount of benzene generated by the decomposition of the samples. Smoke opacification data revealed that ferrocene plays a noticeable role as a smoke suppressant only at temperatures higher than 500° C and unexpectedly strongly enhances the amount of smoke generated at 400° C. A linear correlation has been found between the amount of benzene evolved from the degradation and the amount of smoke generated by the combustion of the samples at temperature higher than 500° C. Experimental evidence shows that in the presence of HC1 generated by the degradation of PVC in air, ferrocene molecules readily oxidize to a-ferric oxide. It is believed that the ferrocene molecule is not itself the active species in the mechanism