Preparation of 1-alkyl-2-chloro-5-nitrobenzene-4-sulfonic acids

Details Preparation of 1-alkyl-2-chloro-5-nitrobenzene-4-sulfonic acids Preparation of 1-alkyl-2-chloro-5-nitrobenzene-4-sulfonic acids

1982-01-29

1984-01-24

Siegel, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260505R, 260505S, C07C14324

Patent

active

044276001

ABSTRACT:
A process for the preparation of compounds of the formula I ##STR1## where R is alkyl, by sulfonation, chlorination and nitration starting from an alkylbenzene, wherein the alkylbenzene is sulfonated with from 2.5 to 3, preferably from 2.65 to 2.75, moles of concentrated sulfuric acid per mole of alkylbenzene, the reaction product is then reacted with from about 1.1 to 1.3 moles of chlorine in the absence of a catalyst, the product is subsequently nitrated with highly concentrated nitric acid at elevated temperatures and the nitro compound is isolated.

REFERENCES:
patent: 1755648 (1930-04-01), Henle et al.
patent: 1759554 (1930-05-01), Henle et al.
patent: 4131619 (1978-12-01), Pews
European Search Report EP 82 10 0680.6.
Roberts et al., "Basic Principles of Org. Chem.", (1965), pp. 784-803.

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