Abstract: The polychlorophenols, e.g., 2,6-dichlorophenol (a known agrochemical intermediate), are effectively prepared by chlorinating ortho-chlorophenol with gaseous chlorine, optionally in the presence of other chlorophenols, characteristically in the molten state, and in the presence of a catalytically effective amount of a primary, secondary or tertiary amine.

Abstract: Phenolic compounds and mixtures thereof, e.g., admixture of 2,4-dichlorophenol and 2,6-dichlorophenol, are selectively chlorinated at a position ortho to a hydroxyl function thereof, by reacting such phenolic compound with gaseous chlorine, in a molten reaction medium, in the presence of a catalytically effective amount of a primary, secondary or tertiary amine.

Abstract: New aromatic polyamide-sulphonamides consisting essentially of recurring units of the formula:-- CO -- Ar.sub.1 -- CONH -- Ar.sub.2 -- SO.sub.2 NH -- Ar.sub.3 -- (SO.sub.2 NH -- Ar.sub.4).sub.n -- NH --in which each of the Ar radicals, which may be identical or different, represents a divalent aromatic radical containing one or more benzene rings, n is 0 or an integer equal to or greater than 1 and the arrow above the --SO.sub.2 NH-- groups indicates that these groups can be reversed to give --NHSO.sub.2 -- groups.These new polymers are infusible products which are resistant to high temperatures and which can be converted into yarns and films.