Übersetzung für "Diazo compound" in Deutsch

The diazo compound is coupled with 6-hydroxy-2-naphthalene-sulphonic acid.

The diazo compound formed is salted out with potassium chloride, filtered off under sunction and dried.

The diazo compound has precipitated in a pale yellow crystalline form.

The diazo compound has precipitated in light yellow crystalline form.

A beige-coloured precipitate (diazo compound) falls out of the solution afterwards.

Finally, the novel diazo compound is coupled with the coupling component listed in column II.

The resulting diazo compound according to the invention is isolated in a conventional manner.

In each case, g of the crystalline diazo compound was stirred for 2 hours in 25 g of

The diazo compound is prepared from this acylation product and is coupled with 1-amino-2-methoxy-5-methylbenzene in a weakly acid medium.

The diazo compound is prepared from this acylation product and is coupled with 1-amino-6-sulpho-naphthalene in a weakly acid medium.

The diazo compound is prepared from this acylation product and is coupled with 1-amino-6-sulphonaphthalene in a weakly acid medium.

Such a process can lead to decomposition of some of the diazo compound before the coupling reaction.

After half an hour of stirring at 0°-5° C., the diazo compound is virtually dissolved.

Afterwards the coupling mixture is stirred for some hours until excess diazo compound is no longer detectable.

The diazo compound prepared is isolated by evaporation of the reaction mixture, if necessary, after filtration to obtain a clear solution.

The diazo compound obtained according to b) is added to the solution obtained according to a).

A diazo compound suitable for this coupling component is obtained by diazotizing, for example, 2-(4'-aminophenyl)-6-methylbenzthiazole.

Such a process can lead to the decomposition of a part of the diazo compound before the coupling.

The diazo compound is then coupled with 4,5-dihydro-5-oxo-1-(4sulphophenyl)-1H-pyrazole-3-carboxylic acid or with the methyl ester, the ethyl ester, or a salt of this carboxylic acid.

The suspension of the diazo compound is then run into a mixture of 33.4 parts of ammonium 1-acetoacetylamino-2-methoxy-5-methylbenzene-4-sulphonate, 15.6 parts of sodium bicarbonate, 100 parts of ice and 100 parts of water.

The disadvantage of the continuous process described in the above-mentioned Publication, particularly in the case of weakly basic amines, is that, in the event of fluctuations in concentration in the starting materials, there prevails alternately a nitrite excess and a nitrite deficit, and, in the event of a nitrite deficit, those fractions of amine which are not immediately diazotized react with the diazo compound to form a diazo-amine compound.

The proportion of the diazo compound, which had not been coupled to give an azo dye, was photolytically destroyed by the measuring light and the UV density was thus lowered.

Thus, for example, esterification can be effected by treating with a suitable diazo compound, such as a diazo-lower alkane, a suitable N,N-di-lower alkylformamide acetal, for example N,N-dimethylformamide diethyl acetal or N,N,N-trimethylformamide methosulphate, or with an oxonium salt, such as a tri-lower alkyloxonium tetrafluoroborate or hexylfluorophosphate, with a carbonate or pyrocarbonate, for example diethyl(pyro)carbonate, or with an alcohol in the presence of a suitable condensing agent, such as a dehydrating agent, for example dicyclohexylcarbodiimide, or, to form a hydroxy-lower alkyl group, with an epoxy-lower alkane, for example ethylene oxide.