Abstract: A process for the preparation of a compound of the formula by means of bioconversion with a microorganism culture of a compound of the formula

Abstract: A process for the preparation of a compound of the formula by means of bioconversion with a microorganism culture of a compound of the formula

Abstract: The invention concerns a method for preparing Fexofenadine from Terfenadine by a bioconversion process using Absidia corymbifera LCP 63-1800 or Stepromyces platensis NRRL 2364 strain.

Abstract: The invention concerns compounds of formula (I): in which: R1 to R4, identical or different, represent hydrogen, alkyl or aryl, themselves substituted if required, R1 and R2 together further capable of representing a bridge —(CH2)m in which m is a whole number from 1 to 5, or a bridge X representing a linear combination of m hydrocarbon groups, m being as defined above and comprising, if required, at least a heteroatom such as O, N or S, or a bridge X representing a linear combination of p heteroatoms O, N and/or S, in which p is a whole number from 1 to 3; A1 and A2 represent —COOH, —SO3H or —PO3H2 radicals, or their derivatives such as esters or amides, or only one of A1 or A2 has these meanings, when R1 and R2 represent a single bond between the carbons in positions 3 and 4, the other of these groups being a hydrogen atom; Y represents a chain —(CH2)n—, n being zero or a whole number from 1 to 5, or represents a linear combination of n hydrocarbon group

Abstract: A compound of the formula ##STR1## having progestomimetic activity, wherein the substituents are as defined in the specification and compositions of a compound of formula I and an estrogen compound.

Abstract: New tetra-alkyl-2,2,5,5-cyclohexanone-4-ol-1-compounds and their sulphonyl derivatives with the general formula: ##STR1## in which: each of R and R', identical or different, represents an alkyl radical (1-5 carbons) and R" represents a hydrogen atom or a radical SO.sub.2 R"' in which R"' represents an alkyl radical (1-5 carbons) or an aryl radical (6-14 carbons), the process and the intermediates for their preparation, as well as their use in the synthesis of cyclopropane lactones of cis structure.

Abstract: The invention relates to a gas phase process for the manufacture of chloropentafluoroethane by the action of hydrofluoric acid on dichlorotetrafluoroethane in the presence of a catalyst, the said catalyst being prepared by reacting, in a gaseous phase, an alumina in which the sodium oxide content is below 300 ppm and the volume of the pores having a radius equal to 40 angstroms or above is greater than 0.7 cm.sup.3 /g, with hydrofluoric acid or with a mixture of hydrofluoric acid and of air, nitrogen or a fluorinated compound.