Imperial Chemical Industries Limited

Michael Yelland

Brian R Fishwick

Denis Robert Ridyard

David Brierley

John L Leng

Thomas Douglas Baron

John Conway

A cycloalkyl phosphorus compound is obtained by the catalytic hydrogenation of a substituted or unsubstituted aryl phosphonic acid using a heterogeneous catalyst which is a Group VIII metal on carbon. The hydrogenation is preferably effected in water. The catalyst can be ruthenium or carbon. When phenylphosphonic acid is used as the starting material, a yield of about 95% of essentially pure cyclohexylphosphonic acid can be obtained.

Hydrogenation of phenylphosphonic acid

Improved method for the manufacture of plant regulant pyridazine-4-one carboxylic acids, which comprises the step of decarboxylating a 4-oxo-3, 5-pyridazine dicarboxylic acid to give a 4-oxo-5-pyridazine carboxylic acid by treatment with 95-100% sulphuric acid at 160.degree.-180.degree. C. using a reactant; acid weight ratio of about 1:4 to 1:10.

Pyridazinone manufacture

Improved method for the manufacture of plant regulant pyridazine-4-one carboxylic acids, which comprises the step of diazo-coupling a benzenediazonium salt with a dialkyl 3-oxoglutarate in the presence of water and a dispersing agent, preferably at a temperature not greater than 5.degree. C.

Water-soluble monoazo dyes for nylon having the formula: ##STR1## wherein ring A may optionally be substituted by halogen, trifluoromethyl, alkoxy, acylamino or alkyl having from 1 to 4 carbon atoms, R represents hydrogen or unbranched alkyl having from 1 to 4 carbon atoms, R.sup.1 represents hydrogen, alkyl or hydroxyalkyl, X represents unbranched alkyl having from 1 to 6 carbon atoms, cycloalkyl, halogen, nitro, trifluoromethyl, sulpho, vinylsulphonyl, hydroxyethylsulphonyl, sulphatoethylsulphonyl, --SO.sub.2 NHR.sup.2, wherein R.sup.2 represents hydrogen or alkyl having from 1 to 4 carbon atoms, or --COOR.sup.3 wherein R.sup.3 represents hydrogen, alkyl having from 1 to 7 carbon atoms, cycloalkyl or aryl, and n represents an integer of from 0 to 3. The dyes are suitable for application to polyamide textile materials. They give a high degree of thermal stability and fastness to wet treatments and to light.

Water soluble monoazo dyes for nylon

2-Nitro-4'-aminodiphenylamine,2',4-disulphonic acid, a new intermediate for azo dyes, is prepared by the monosulphonation of 2-nitro-4'-aminodiphenylamine-4-sulphonic acid or 2-nitro-4'-acetylaminodiphenylamine-4-sulphonic acid.

2-Nitro-4'-aminodiphenylamine-2',4-disulfonic acid and process for its

Anthraquinone dyes having the formula: ##STR1## wherein R represents an optionally substituted alkyl, aryl, cycloalkyl, alkoxy, aryloxy or cycloalkoxy radical and each of R.sup.1 and R.sup.2, independently, represents hydrogen or a C.sub.1-4 alkyl radical. The dyes are applicable as acid dyes to natural and synthetic polyamide textiles.

Anthraquinone dyes

Water-soluble monoazo dyes, useful for dyeing polyamide textiles, are obtained by acid coupling aryl esters of anthranilic acid (which may be further substituted in the anthranilic ring) with 2-amino-8-naphthol-6-sulphonic acid.

Anthranilic acid arylester-azo-aminonaphthol sulfonic acid dyes

A water-insoluble azo dyestuff of the formula:- ##SPC1## Wherein R is lower alkyl; the ring A is unsubstituted or is substituted by chlorine, bromine or nitro; Y is hydrogen, lower alkyl or lower alkoxy; Z is hydrogen, lower alkyl, lower alkoxy, chlorine or a group of the formula --NHCOR.sup.1 wherein R.sup.1 is lower alkyl; and X.sup.1 and X.sup.2 are independently selected from hydrogen, lower alkyl, hydroxy lower alkyl, lower alkylcarbonyl lower alkyl, cyano lower alkyl, lower alkoxycarbonyl lower alkyl, lower alkoxy lower alkyl, lower alkylcarbonyloxy lower alkyl, lower alkoxy lower alkoxycarbonyl lower alkyl, cyano lower alkoxy lower alkyl, chloro lower alkyl, phenoxy lower alkyl, phenyl, lower alkylcarbonylamino lower alkyl, cyano lower alkoxycarbonyl lower alkyl and lower alkylcarbonyloxy lower alkoxy carbonyl lower alkyl, a process for the manufacture of the said dyestuff and its use for colouring synthetic textile materials.

Growing community of inventors

Manchester, United Kingdom

Michael Yelland