Abstract: The invention concerns quaternary ammonium compounds whereof the nitrogen bears a fluorine atom. Said ammonium compounds have an asymmetric carbon atom which is spaced from the ammonium function by not more than five members. The invention is useful for enantioselective electrophilic fluorination of various substrates.

Abstract: The invention concerns a stabilising composition for halogenated polymer comprising at least a compound of formulae (I) and/or (II), wherein: X, Y, Z, identical or different, represent an oxygen atom, a nitrogen atom, a sulphur atom, or a phosphorus atom; R1 represents a radical comprising 1 to 20 carbon atoms; R2 represents a hydrogen atom, a radical comprising 1 to 20 carbon atoms, a —COR radical; R1 and R2 are optionally mutually bound so as to form a cycle; R3 and R4, identical or different, represent a hydrogen atom, a radical comprising 1 to 20 carbon atoms; n=1 depending on the valence of X, m=0 to 2 depending on the valence of Y; p=0 to 2 depending on the valence of Z; q is an integer between 1 and 10, preferably between 1 and 4.

Abstract: The invention concerns a composition based on phenolic derivatives and their use as mineral binder additives, enabling to obtain mineral matrices, preferably of mortars and concrete mixtures, with improved properties. The invention also concerns a composition for binders, in the form of a powder or an aqueous suspension, comprising at least a phenolic derivative and at least a polymer. The invention further concerns methods for preparing those various compositions, and their uses in particular for making mortars and concrete mixtures.