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But the technique of the German dye industry solved this as satisfactorily and as steadily as other chemical warfare problems, bringing its technical experience to bear on the different difficulties involved. Diphenychlorarsine. This was the earliest and main constituent of the familiar Blue Cross shell. It was prepared in four stages: The preparation of phenyl arsinic acid.
The first step, that of the manufacture of phenyl arsinic acid, was carried out at Ludwigshafen in one of the existing azo dye sheds without any alteration of plant, just as a new azo dye might have been produced in the same shed. It is believed that another dye factory also produced this substance. At Ludwigshafen the conversion to diphenyl arsinic acid occurred.
The conversion of the above to phenyl arsenious oxide. The conversion of the latter into diphenyl arsinic acid. The conversion of the latter into diphenyl-chlor-arsine. This is another example of a highly complicated product which might have presented great difficulties of production, but the problem of whose manufacture was solved, almost automatically, by the German organisation.
Reduction of Lever- Conversion to Lever- Reduction of A.G.F.A. Phenyl arjinic kusen Diphenylar- kusen Diphenylar- Hochst acid to Phenyl and sinic acid by and sinic acid to arsenious oxide Hochst treatment Hijchst Diphenyl: with Diazo chlor-arsine benzene by Sulphur dioxide in HCl solution Ethyl arsinic wigs- Ethyl arseni acid to Ethyl hafen ous Oxide to
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