Imperial Chemical Industries Limited

Brian Anderson

Raymond F Dalton

Cecil V Stead

Alan T Costello

Duncan Adrian Phillips

Philip Martin Rowbotham

Neville Jackson

Dyestuffs are provided which contain one or more 1,3-dicyanobenzene radicals linked to the dyestuff at the 2-, 4- or 6-position, with halogen substituents in both of the remaining two of these positions and an electron-attracting substituent in the 5-position. These dyestuffs reactively dye cellulose at low temperatures and are less prone to 'acid-bleeding' than some known reactive dyes. More particularly, those dyestuffs have the formula: ##STR1## where D is a chromophoric group

Reactive dyestuffs containing chlorine or fluorine substituents and one

A dyestuff of the formula ##STR1## where D is a chromophoric residue

5-(2-Hydroxyphenyl)tetrazoles having substituents containing at least 5 aliphatic or alicyclic carbon atoms are prepared from the corresponding o-hydroxybenzyl cyanides with alkali metal azides. These tetrazoles are useful as extracting agents in liquid-liquid extraction processes for metals, especially copper. When used in such processes in combination with o-hydroxyaryl oximes they improve the extraction kinetics of the oximes.

5-(2-Hydroxyphenyl)tetrazolyl compounds

O-Hydroxyphenyl benzyl ketoximes, preferably containing as substituents one or more alkyl or alkoxy groups containing a total of from 3 to 25 carbon atoms, are used to extract metals from aqueous solutions of their salts as complex compounds soluble in water-immiscible organic solvents. The ketoximes are prepared from the corresponding ketones by reaction with hydroxylamine.

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Brian Anderson